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G32
Service Manual
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Moffat G32 Service Manual

G32 CONVECTION OVEN
Applies to units from S/N 40256
SERVICE
MANUAL
Revision 5/F3528
January, 2004
Manual P/N M0MG32
CONTENTS
This manual is designed to take a more in depth look at the G32 convection oven for the purpose of making the unit more understandable to service people.
There are settings explained in this manual that should never require to be adjusted, but for com­pleteness and those special cases where these settings are required to change, this manual gives a full explanation as to how, and what effects will result.
SECTION PAGE NO.
1. SPECIFICATIONS ........................................................................................................ 5
2. INSTALLATION............................................................................................................ 7
3. OPERATION ................................................................................................................. 11
3.1 Description of Controls
3.2 Explanation of Control System
4. MAINTENANCE ............................................................................................................ 15
4.1 Cleaning
4.2 Routine Procedures
5. TROUBLE SHOOTING GUIDE..................................................................................... 17
6. SERVICE PROCEDURES............................................................................................. 22
6.1 Fault Diagnosis
6.2 Access
6.3 Replacement
6.4 Adjustment / Calibration
7. CIRCUIT SCHEMATICS ............................................................................................... 43
7.1 220-240V (United Kingdom Only)
7.2 100-120V 60Hz (USA, Canada)
7.3 220-240V 50Hz (Not United Kingdom)
8. ELECTRICAL WIRING DIAGRAMS ............................................................................. 49
8.1 220-240V (United Kingdom Only)
8.2 100-120V (USA, Canada)
8.3 220-240V 50Hz (Not United Kingdom)
9. SPARE PARTS ............................................................................................................. 55
IMPORTANT: MAKING ALTERATIONS MAY VOID WARRANTIES AND APPROVALS.
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10. ACCESSORIES / OPTIONS ......................................................................................... 57
11. PARTS DIAGRAM........................................................................................................ 58
11.1 Main Assembly
11.2 Control Panel Assembly
11.3 Ignition Electrode Assembly
11.4 Gas Piping Assembly
12. SERVICE CONTACTS ................................................................................................. 69
APPENDIX A. Ignition Box Replacement Kits ................................................................... 71
APPENDIX B. Ignition Box Specifications ......................................................................... 75
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MODEL: G32
710
710
(28.0)
1. SPECIFICATIONS
WATER ENTRY
800
800
(31.5)
MWS
E
1
GAS
50
50
(2.0)
70
70
(2.75)
110
FRONT SIDE
110
(4.33)
220
290 220
290
(11.4)
GAS ENTRY
(8.65)
205
205
E
1
GAS
(8.07)
MWS
ELECTRICAL ENTRY
150
150
875
875
(5.90)
(34.5)
PLAN
LEGEND
- Electrical connection entry point
- Water entry - ¾” BSP hose connection
- Gas connection entry point - ½” BSP female (not USA / Canada)
- ½” NPT female (USA / Canada only)
Dimensions shown in millimetres. Dimensions in inches shown in brackets.
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LOCATION
This oven must be installed in an area of adequate air supply. The following minimum clearances for air openings, servicing, operation and installation are to be adhered to:
Rear 75mm / 3” Left-hand side 75mm / 3” Right-hand side 75mm / 3” Top 200mm / 8” (or 600mm from a combustible surface.) Floor 127mm / 5”
OVEN INTERNAL DIMENSIONS
Width 468 mm / 18.5” Height 533 mm / 21” Depth 711 mm / 28” Oven Volume 0.18 m³ / 6.3 ft³
OVEN RACK SIZE
Width 460 mm / 18” Depth: 660 mm / 26”
GAS SUPPLY SPECIFICATION OPTIONS
Natural LPG/Prop (G20 UK) (G31 UK)
Input Rating 35 MJ/hr 35 MJ/Hr 33 000 Btu/hr 33 000 Btu/hr
9.5 kW 9.5 kW
Gas Rate 0.91 m³/hr 0.67 kg/hr
32.1 ft³/hr 1.48 lb/hr
Supply 1.13 kPa 2.75 kPa Pressure 4.5”w.c. 11.0”w.c. (Not USA/Can/UK)
Operating 0.90 kPa 2.25 kPa Pressure 3.6”w.c. 9.0”w.c. (Not USA/Can/UK)
Operating 10 mbar 35 mbar Pressure (UK only)
Operating 1.13 kPa 2.75 kPa Pressure 4.5”w.c. 11.0”w.c. (USA/Can only)
GAS CONNECTION SPECIFICATIONS
½” BSP female - Not USA / Canada ½” NPT female - USA / Canada only
ELECTRICAL SUPPLY SPECIFICATION OPTIONS
110-120 V AC, 60 Hz, 2.0 A, 1 Phase 220-240 V AC, 50 Hz, 0.7 A, 1 Phase 230-240 V AC, 50 Hz, 0.55A, 1 Phase 220-240 V AC, 60 Hz, 0.7 A, 1 Phase
ELECTRICAL PLUG SPECIFICATION REQUIREMENTS
Australia AS 2124, 10 Amp, 3 pin Canada NEMA 5-15, 15 Amp, 3 pin New Zealand AS 2124, 10 Amp, 3 pin United Kingdom BS 1363A 13A fused, 3 pin United States NEMA 5-15, 15 Amp, 3 pin Other Countries Type to meet country standards
BURNER INJECTOR ORIFICE SIZE
LPG/Prop/Butane 1.70 mm / No 51 drill size Propane (G31) 1.55 mm (UK only) Natural 2.70 mm / No 36 drill size Natural (G20) 2.60 mm (UK only)
WATER SUPPLY CONNECTION
Max Pressure 550 kPa / 5.5 bar / 80 psi Min Pressure 100 kPa / 1.0 bar / 15 psi
AUTOMATIC IGNITION CONTROL
110 Volt Models (24 Volt ignition system)
2 re-ignition attempts after burner ignition failure. 30 second purge time between ignition attempts. Lock-out condition after 3 ignition failures.
2 re-ignition attempts in the event of flame loss during burner operation. 30 second purge time between ignition attempts. Lock­out condition after 2 re-ignition attempt failures.
220-240 Volt Models* Lock-out condition after burner ignition failure. No re-ignition attempt.
1 re-ignition attempt in the event of flame loss during burner operation. Lock-out condition if re-ignition failure.
* Specifications apply to units from serial
number 203927.
NOTE:
Refer to Appendix B for further
ignition control specifications.
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2. INSTALLATION
WARNING: THIS APPLIANCE MUST BE GROUNDED.
WARNING: ALL INSTALLATION AND SERVICE REPAIR WORK MUST BE CARRIED OUT BY QUALIFIED PERSONS ONLY.
This appliance must be installed in accor­dance with national installation codes and in accordance with relevant national / local codes covering gas, fire, and health.
UNITED KINGDOM -Gas Safety (Installation
& Use) Regulations 1984 (Amendment
1990).
AUSTRALIA - AG601 – 1992, Gas Installation
Code.
NEW ZEALAND – NZS5261, Installation of
Burning Appliances and Equipment.
UNITED STATES – ANSI Z23.1 (Latest
edition) National Gas Fuel Code
CANADA – CANI-B149, Installation Codes for
Gas Burnings Appliances and Equipment
Installations must be carried out by authorised persons only. Failure to install equipment to relevant codes and manufacturers specifica­tions in this section will void warranty. The oven and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 3.45 kPa / 34.5 bar / 0.5 psi.
This oven must be electrically grounded in accordance with local codes.
BEFORE CONNECTION TO POWER AND GAS SUPPLY
Unpack and check unit for damage and report any damage to the carrier and dealer. Report any deficiencies to your dealer. Fit the feet which are packed inside the oven. Fit door handle to oven door. Check that the available power supply is correct to that shown on the rating plate located on the right-hand side panel.
110-120 V AC, 60 Hz, 2.0 A, 1 Phase 220-240 V AC, 50 Hz, 0.7 A, 1 Phase 230-240 V AC, 50 Hz, 0.55 A, 1 Phase 220-240 V AC, 60 Hz, 0.7 A, 1 Phase
LOCATION
This oven must be installed in an area of ade­quate air supply. The following minimum clearances for air openings, servicing, opera­tion and installation are to be adhered to:
Rear 75mm / 3” Left-hand side 75mm / 3” Right-hand side 75mm / 3”
A minimum of 200mm or 8” clearance above the appliance to any shelves or ceilings. For installation on combustible floors use four x 5” (127mm) high adjustable feet.
Position the oven in its allocated working position. Use a spirit level to ensure the oven is level from side to side and front to back. (If this is not carried out, uneven cooking could occur). The feet/legs used with bench or floor mounting or provided with stands are adjustable and will require adjusting in levelling the unit. It should be positioned so the operating panel and oven shelves are easily reachable for loading and unloading.
IMPORTANT: THE OVEN VENT LOCATED ON THE CABINET TOP
MUST NEVER BE OBSTRUCTED.
BEFORE USE
Operate the oven for about 1 hour at 200°C (400°F) to remove any fumes or odours which may be present.
ELECTRICAL CONNECTION
G32 convection ovens are supplied with pre-fitted cords. Ensure unit is fitted with the correct cord and plug for the installation (refer specifications section).
Should changing of the cord be necessary, gain access to the electrical connection terminal block and strain relief by removing the rear access panel (four screws).
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L1 L2
Phase
RED
BROWN
BLACK
WARNING:
Neutral
BLACK
BLUE
WHITE
THIS APPLIANCE MUST
BE GROUNDED / EARTHED
Ground
GREEN
GREEN/YELLOW
Figure 2.1
GAS CONNECTION
A ½” BSP female elbow is provided for at the bottom of oven rear.
USA/Canada models have a ½” NPT female connection.
A restraint chain anchor has been provided above the gas connection point for fitment of a restraint chain when a flexible gas line is fitted.
It is important that adequately sized piping run directly to the connection joint on the oven with as few tees and elbows as possible to give maximum supply volume.
A suitable jointing compound which resists breakdown action of LPG must be used on every gas connection.
Check all connections for leakages.
Check appliance rating plate for correct orifice size and operating pressure for the gas being installed before operation.
The appliance combination gas valve is fitted with an internal regulator for adjusting the operating pressure.
To access, remove appropriately marked side service panel from bottom right side of oven. Unscrew and remove regulator cap from gas valve. Fit pressure gauge to pressure test point (located at bottom right side of oven, behind service panel). Turn on main burner, and adjust regulator to achieve stated pressure whilst burner is running. Turning the screw clockwise increases the pressure, whilst turning counter-clockwise decreases the pressure.
WATER CONNECTION
A cold water supply should be fitted to the water inlet (¾” BSP hose connection) which is located on the rear of the right hand side of the unit. Alternately, a connection elbow and sealing washer is supplied with this unit for direct connection of a 1/2” ID hose, and is recommended for easy installation and service.
Connect water supply - Max inlet pressure 80psi / 550kPa.
Turn on water supply to check for leaks.
IMPORTANT: MAXIMUM INLET WATER
PRESSURE IS 550 kPa / 80 psi.
DOOR HANDLE INSTALLATION
1. Open oven door.
2. Remove two screws (item 2).
3. Remove the two screws (item 3) from the handle (item 1).
4. Install the handle bracket through the slot on the door side.
5. Screw in the two screws (item 2) fully, then fully screw in the previous two screws (item 3). Ensure that they are tight.
1
3
2
IMPORTANT: ENSURE MANUAL ISOLATING VALVE LOCATED ON RIGHT HAND SIDE OF OVEN BEHIND GAS CONTROL SERVICE PANEL IS OPENED FOR OPERATION.
On initial start-up of unit check burner colour. Burner should be bright orange after 1 minutes operation.
A draft flame plume of approximately 75mm (3 inches) of blue/orange colour is normal.
Figure 2.2
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OVEN RACKS
The oven is supplied with four general purpose oven racks. These racks incorporate two important safety features:
1. Self Supporting: When fitted, the oven racks are self supporting and will not drop or angle down when the racks are withdrawn during operation, when loading and unloading products on racks or when attending to the product being cooked during it’s cook cycle.
2. Auto Supporting: The oven rack supports incorporate a special retaining tab which provides a positive stop to each oven rack and stops it’s inadvertent removal during normal operation.
To fit the oven racks ensure that the rack back stop is positioned at the rear of the oven and install by following the steps shown in figure
2.3.
To remove oven racks reverse the procedure.
Figure 2.3
DOUBLE STACKING UNITS
When it is desired to mount a G32 Turbofan oven on an E87 prover, a double stacking kit must be used. Available from your dealer or your Turbofan distributor (see Accessories Section).
When mounting one oven on top of another (refer figure 2.4), a double stacking kit is also required.
WARNING: THE ELECTRICAL SUPPLY MUST BE DISCONNECTED
BEFORE UNITS ARE STACKED.
Assembly Steps:
Bottom Unit
1. Fully wind out the adjustable legs on the
bottom so there is 6" (150mm) clearance from the floor to the oven's base.
2. Unscrew vent hood plate from bottom oven. Remove and discard hood plate and spacer tubes. Replace vent hood screws and screw in completely to secure wrapper to vent tube.
3. Position shroud back on top of bottom unit so that it is positioned correctly over oven back. Position flue duct on bottom unit so that it is positioned centrally in shroud back flue cut-out and is flush with oven back. Check that the oven vent is covered and mark the six hole positions (3 down each side of the flue duct) on the oven wrapper.
4. Drill six ø 3.5mm holes in the oven wrap­per where marked.
5. Screw the flue duct to the wrapper with six
3
/8" x 8 Phillips screws into these holes.
Top Unit
1. Tip oven onto its back and remove the 1" or 4" feet screwed into the base.
2. Assemble the four sides of the shroud (shroud front, shroud back, shroud sides (x2)) with the
3
/16" screws as shown. Do not tighten the screws until the ovens are stacked.
3. Screw the shroud assembly to the base of the oven using the
3
/8" screws and washers so that all faces of the shroud are flush with the sides of the oven base. Be sure to have the large flange of the shroud back at the rear of the oven.
Stacking the Ovens
1. Remove the outside two screws along the top rear of the bottom oven.
2. With two or three persons, lift the top oven onto the bottom oven and position so that the down folds on the shroud sides and back all butt hard up around the back and sides of the oven wrapper.
3. Secure top unit into position by replacing the two outside screws of the four previously removed.
4. Position the chimney on the rear of the units. Mark the four hole positions (two on the top unit/ two on the bottom unit.)
5. Drill the four ø3.5mm holes.
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6. Screw the chimney to the rear of the top unit with these so that the bottom of the chimney mates up with the flue duct of the bottom unit. Screw together with four remaining
3
/8” x 8 Phillips screws supplied.
Units manufactured up to July 2002.
The rating plate for the G32 convection oven is located at the bottom right corner of the RH side panel.
Rating Plate
Figure 2.6
Figure 2.4
RATING PLATE LOCATION
Units manufactured from July 2002.
The rating plate for the G32 convection oven is located at the RH side front bottom corner.
Rating Plate
Figure 2.5
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3. OPERATION
NOTE: A full user’s operation manual is supplied with the product and can be used for further
referencing of installation, operation and service.
3.1 DESCRIPTION OF CONTROLS
1. POWER
Depress to switch power on or off (switch illuminates when power is on).
2. THERMOSTAT Temperature range 50 - 320°C (150 - 600°F). Indicator illuminates when burner is cycling
1
ON to maintain set temperature.
3. BAKE TIMER 1 Hour bake timer. (Indicator illuminates when “time up” (0) reached, and buzzer sounds).
2
3
4
5
4. ROAST N HOLD Depress switch to activate ’ROAST N HOLD’ function (Switch illuminates when ON).
5. ROAST TIMER 3 Hour roast timer. (Indicator illuminates when “time up” (0) reached, and product held at 75°C (167°F).
6. STEAM SWITCH Push switch to activate water injection (Water injects into oven while the button is depressed).
7. LIGHT SWITCH Push switch to activate lights. (Lights illuminate while button depressed).
6
7
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3.2 EXPLANATION OF CONTROL
SYSTEM
The G32 Turbofan convection oven features multi-function operator controls for which a correct understanding of their operation is required before carrying out any service or fault repair work. The control device functions are explained as follows:
A power switch on the control panel isolates all to the controls of the oven. With the power switch Off all functions of the oven are inoperable.
With the power switch On (illuminated) power is directly supplied to the 60 minute bake timer, steam (water injection) switch, door microswitch, light switch, and the temperature control circuit. The oven circulation fan will operate only when the thermostat is turned on, although will continuously run when the thermostat cycles on/off to maintain oven set temperature. The control panel light switch will turn the oven lights on when the door is closed only when the light switch is held in. The oven lights will come on automatically when the door is open, as this is controlled by the door microswitch.
The 60 minute timer is a mechanical timer and can therefore be operated with the oven’s power switch On or Off. However, only with the oven’s power switch On will the switch contacts of the 60 minute timer turn on the time-up buzzer and illuminate the time-up indicator on the control panel. The buzzer and time-up indicator provide indication that the time setting has run down to zero and at this point will remain On continuously until the 60 minute timer has been manually set back to the Off (vertical) position. The 60 minute timer does not control any other part of the oven’s operating system as this timer is independent of the temperature control and heating system.
The steam (water injection) switch on the control panel can be operated whenever the power switch is On. The switch is momentary like the light switch and when depressed, will operate the electric solenoid valve at the rear of the oven and inject water across the oven fan from the flat spray (vertical) nozzle positioned at the rear of the oven. Releasing the steam button will close the solenoid valve. This feature is used to instantaneously add steam into the oven.
The temperature control of this oven is with a capillary type thermostat which can be set to a required cooking temperature.
The thermostat switch has a separate switch body assembled onto the front from the shaft assembly and when the thermostat is set to a cooking temperature, the switch contacts turn on the oven fan. The switch is closed (fan on) whenever the thermostat is not in the Off (vertical) position. The control panel indicator light above the thermostat knob cycles On and Off with the thermostat to indicate when the gas burners are on and the oven is heating.
The G32 Turbofan oven has a infrared surface combustion burner fitted in a burner box underside the oven. The burner box is directly ducted into the oven chamber through a flue duct connecting to an opening behind the oven circulation fan. The fan draws the burner box heated air and products of combustion directly into the oven chamber (directly fired system) to maximise performance. A flue exit in the top of the oven chamber provides final flueing of the combustion products out of the oven.
The burner being of an infrared type is provided with primary combustion air at the injector orifice intake at the front of the burner, and draws in the primary air through the venturi effect of the burner mixer tube elbow. Additional secondary air is provided in the burner box via an air intake on the underside of the burner box that is intake ducted to the air openings on the right hand side of the G32 base assembly. The addition of the secondary air allows for complete combustion of the gas due to the infrared burner being under the draft conditions of the oven fan extraction on the burner box. Accordingly, the infrared burner will display conventional surface combustion infrared combustion characteristics as well as having a flame plume drafted toward the right hand side of the oven (toward the burner box flue duct) when viewed from the front of the oven, after removal of the front service panel.
The burner is automatically controlled by the main oven thermostat or hold thermostat, via an automatic ignition and valve control device, which operates a gas solenoid valve to provide gas to the burner as required to maintain the set thermostat temperature.
NOTE:
On 110 volt models the ignition
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control and gas control valve operate on 24 volts AC through a 110 volt - 24 volt transformer. For these models the thermostat powers the transformer, whereas on 220-240 volt models the thermostat powers the ignition control directly.
On the thermostat calling for heat, the thermostat will switch power to the ignition control. The ignition control will then power the gas control valve to open the solenoids and provide gas to the burner. At the same time the ignition control will generate a high voltage ignition spark sequence conveyed to the ignition electrodes mounted at the front of the burner and oven through a high tension ignition cable. The spark and earth ignition electrodes will spark across the end gap between these two to ignite the burner.
On successful ignition of the burner the third electrode, being a flame rectification rod, will be in the burner flame. This provides the ignition control with confirmation that the burner is lit by establishing a micro-amp current from the electrode to earth through the flame due to combustion flames being ionised and therefore able to conduct minute electrical currents. The flame electrode is connected to the ignition control with an insulated wire conductor.
If this ignition sequence occurs correctly the spark sequence will be stopped and the burner will continue to operate until the thermostat switches off and shuts down the ignition control and consequently closes the gas solenoid valve.
Should the ignition control not sense the burner flame within a fixed ignition / spark sequence period, the ignition control will lock­out and turn off the gas solenoid valve on 220-240 volt models. Lock-out condition requires the oven thermostat to be switched off before operation can be restarted. On 110 volt models only, an unsuccessful ignition attempt will be followed by a 30 second purge with the gas control valve shut, then re-attempt ignition automatically. 2 re-ignition retries will be attempted. If unsuccessful the ignition control will then lock-out and shut the gas valve off.
If the ignition control loses the burner flame during an on period, a re-ignition attempt will be started automatically. If this is unsuccess­ful the ignition will go to lock-out mode.
NOTE:
Different voltage and market models
have different ignition sequence and re-ignition specifications. Refer to appendix B for specific model details.
The gas solenoid valve also includes the gas regulator and on installation is adjusted to achieve correct burner gas operating pressure.
The G32 Turbofan convection oven features a Roast-and-Hold system which can be used to automatically set the oven to a fixed holding temperature at the end of a timed cooking period. When the Roast-and-Hold switch is turned On the switch will illuminate and switch on a relay found inside the control panel, at the base of the control housing next to the door microswitch. When the relay is switched ON a normally closed switch pole on the relay is opened and the normal power supply to the oven thermostat is isolated. A second normally open switch pole is closed and this provides power to the 3 hour roast timer.
If the roast timer is in the Hold (vertical) position the timer switch contacts will be in their normally closed position and supply power directly to the Hold thermostat located behind the control panel. The Hold thermostat is factory set to 75°C (167°F) and will supply power to the ignition and gas burner as required to maintain its preset temperature.
The thermostat heating light will also cycle On/Off as the Hold thermostat maintains temperature.
In the Roast-and Hold mode the 3 hour timer can be set to a selected roasting time. During this time period the normally open switch contacts of the timer are closed. The timer has two change over switches and in this position one is used to supply power to its timing motor and the other is used to switch power directly to the main oven thermostat. During the 3 hour timer run-down period the oven temperature will be controlled by the main oven thermostat to the set temperature and operate as previously described.
When the 3 hour timer has run down and reached the Hold position the two switch contacts change over to their normally closed position which isolates power from the timer motor and the oven thermostat. It also switches power back to the oven hold thermostat. At this point the temperature control is now maintained by the hold thermostat as previously described. To
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cancel the hold circuit the Roast-and-Hold switch is turned Off. This turns off the relay which removes power from the 3 hour timer and closes the pole on the relay that feeds the main oven thermostat. The Hold indicator light above the 3 Hour timer will illuminate whenever the oven is operating in hold mode (Roast ‘n Hold selected, and 3 Hour timer at zero position).
The factory preset hold thermostat can be adjusted as required to change the holding temperature if necessary. Refer Service section for this procedure.
The Troubleshooting Guide (Section 5) should be used to identify any incorrect oven operation. On correct identification of the operating fault the Troubleshooting Guide will make reference to the corrective action required, or refer to the Fault Diagnosis section and/or Service section to assist in correction of the fault.
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4. MAINTENANCE
WARNING: ALL INSTALLATION AND SERVICE REPAIR WORK MUST BE CARRIED OUT BY QUALIFIED PERSONS ONLY.
4.1 CLEANING
WARNING: ALWAYS TURN THE
POWER SUPPLY OFF BEFORE CLEANING.
IMPORTANT: THIS UNIT IS NOT
WATER PROOF. DO NOT USE A WATER JET SPRAY TO CLEAN INTERIOR OR EXTERIOR OF THIS UNIT.
EXTERIOR
Clean with a good quality stainless steel cleaning compound. Harsh abrasive cleaners may damage the surface.
Do not use oven cleaners or caustic solutions to clean the control panel as these cleaners will damage plastic components.
INTERIOR
Ensure that the oven chamber is cool. Do not use wire brushes, steel wool or other abrasive materials. Clean the oven regularly with a good quality oven cleaner. Take care not to damage the fan or the tube at the right side of the oven which controls the thermostat.
OVEN RACKS
To remove, slide out to the stop position, raise the front edge up, and lift out.
SIDE RACKS
To remove, lift front top to disengage and slide rack forward. To replace, slide top rear slot in rack onto rear stud, then engage front keyhole on front stud.
OVEN BASE TRAY
Remove when cleaning oven, and to allow easier cleaning of enamelled base tray. Ensure tray is refitted before use.
LAMP GLASS
To remove glasses, unscrew anti-clockwise. To replace, screw in clockwise.
IMPORTANT: DO NOT OVER TIGHTEN LAMP GLASS.
NEVER OPERATE OVEN WITH LAMP
GLASSES REMOVED
OVEN SEALS
To remove, hold at their centre point and pull forward until they unclip. Remove side seals first, then top and bottom. The seals may be washed in the sink, but take care not to cut or damage them. To replace, ensure that the lip is facing the oven opening. Fit the top and bottom seals first, then the side seals.
OVEN DOOR GLASS
Clean with conventional glass cleaners.
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4.2 ROUTINE PROCEDURES
PROCEDURE INTERVAL
DOOR SEALS Check for deterioration. 12 months
DOOR PIVOT BUSHES Check for wear. 12 months
DOOR CATCH Ensure that catch is adjusted such that the door closes
properly.
WATER NOZZLE Check for liming in water nozzle. 12 months
HT LEAD / ELECTRODE Check for deterioration. 12 months
12 months
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5. TROUBLE SHOOTING
WARNING: ALL INSTALLATION AND SERVICE REPAIR WORK MUST BE CARRIED OUT BY QUALIFIED PERSONS ONLY.
FAULT POSSIBLE CAUSE REMEDY
THE OVEN DOES NOT OPERATE / START
NO HEAT / BURNER NOT WORKING
The mains isolating switch on the wall, circuit breaker or fuses are “off” at the power board.
The power switch on the oven is off.
Incorrect electrical supply.
(Refer fault diagnosis 6.1.1)
Overtemp tripped (UK only).
(Refer fault diagnosis 6.1.1)
Power switch on unit faulty.
(Refer fault diagnosis 6.1.1)
Gas supply not turned on.
Manual isolating valve on unit closed.
Incorrect gas pressure setting for burner
Blocked injector.
Burner ignition spark faulty.
(Refer fault diagnosis 6.1.2)
Burner flame not being sensed.
(Refer fault diagnosis 6.1.2)
Ignition transformer faulty ­110V models only
(Refer fault diagnosis 6.1.2)
Ignition / burner control box faulty.
(Refer fault diagnosis 6.1.2)
Gas valve faulty.
(Refer fault diagnosis 6.1.2)
No power to thermostat.
(Refer fault diagnosis 6.1.2)
Thermostat faulty.
(Refer fault diagnosis 6.1.2)
Turn on.
Depress switch. Switch will illuminate.
Ensure electrical supply correct.
Reset / replace overtemp.
(Refer service section 6.3.16)
Replace.
(Refer service section 6.3.4)
Turn on gas supply
Remove r/h service panel and turn on/open isolating valve.
Set correct regulator pressure.
(Refer section 2: Installation for correct setting procedure)
Clean / replace.
(Refer service section 6.3.21)
(Refer fault diagnosis 6.1.2)
(Refer fault diagnosis 6.1.2)
Replace.
(Refer service section 6.3.17)
Replace.
(Refer service section 6.3.18)
Replace.
(Refer service section 6.3.20)
Identify fault and correct.
Replace.
(Refer service section 6.3.9)
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FAULT POSSIBLE CAUSE REMEDY
BURNER INCORRECT COLOUR
(Refer installation section— Gas Connection and Adjustment for correct colour)
BURNER NOISY (BURNER BLOWBACK / BURNER BACKFIRE)
Incorrect gas type.
Incorrect burner orifice size fitted.
Incorrect burner pressure setting.
Obstructed burner injector.
Burner obstructed.
Oven flue obstructed.
Oven fan obstructed.
Injector out of alignment.
Oven not installed with correct legs / feet fitted. (Not applicable to units on stands)
Installation clearances not correct.
Gas leak.
Flue obstruction.
Oven fan not operating.
(Refer Fault: Fan doesn’t operate)
Burner obstruction.
Burner faulty.
(Refer fault diagnosis 6.1.3)
Check appliance gas type. (Refer installation section)
Ensure orifice is correct.
(Refer specification section)
Check gas pressure.
(Refer installation section— Gas Connection and Adjustment)
Check injector.
(Refer service section 6.3.21)
Remove burner and inspect for obstructions. (Refer service section 6.3.22)
Check for obstructions.
Check for obstructions.
Check injector alignment.
(Refer service section 6.4.9)
Fit correct legs/feet (Refer installation section)
Ensure correct installation clearances. (Refer installation section)
Leak test and repair.
Ensure oven flue/vent on top of oven is not obstructed.
Ensure oven flue/vent not blocked on inside of oven.
Remove burner and inspect for obstruction. (Refer service section 6.3.22)
Replace. (Refer service section 6.3.22)
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FAULT POSSIBLE CAUSE REMEDY
FAN DOESN’T OPERATE Thermostat not on.
(Fan only operates when the thermostat is on).
Thermostat fan switch faulty.
(Refer fault diagnosis 6.1.4)
Fan motor faulty.
(Refer fault diagnosis 6.1.4)
Wiring.
OVEN LIGHT NOT ILLUMINATING - DOOR OPEN (AUTOMATICALLY ON)
OVEN LIGHT NOT ILLUMINATING - DOOR CLOSED (MANUALLY SWITCHED ON)
NO WATER INJECTION / STEAM
Blown bulb.
No power to light.
(Refer fault diagnosis 6.1.5)
Blown bulb.
Light switch faulty.
(Refer fault diagnosis 6.1.6)
Water not turned on.
Oven water nozzle blocked.
Fault with water valve.
(Refer fault diagnosis 6.1.7)
Steam switch faulty.
(Refer fault diagnosis 6.1.7)
Turn thermostat on.
Replace thermostat.
(Refer service section 6.3.9)
Replace.
(Refer service section 6.3.15)
Check and tighten any loose wiring.
Replace.
(Refer service section 6.3.1)
Correct fault.
Replace.
(Refer service section 6.3.1)
Replace.
(Refer service section 6.3.4)
Turn water on at water supply.
Remove, clean or replace. (Refer service section 6.3.13)
Service or replace as required.
(Refer service section 6.3.11,
6.3.12)
Replace. (Refer service section 6.3.4)
CONTINUOUS WATER OUT OF OVEN WATER NOZZLE
60 MINUTE TIMER WILL NOT TIME DOWN
60 MINUTE TIMER INACCURATE BELOW 20 MINUTES
60 MINUTE TIMER NO TIME UP BUZZER
With oven on only—Electrical fault.
(Refer fault diagnosis 6.1.8)
With oven on or off—Fault with water valve.
(Refer fault diagnosis 6.1.7)
Timer faulty.
Timer not set correctly.
Zero (time up) position not set correctly.
Buzzer faulty.
(Refer fault diagnosis 6.1.9)
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Correct electrical fault.
Service or replace as required.
(Refer service section 6.3.11,
6.3.12)
Replace.
(Refer service section 6.3.7)
For timer settings below 20 minutes, always rotate past 20 minutes, then back to desired time.
(Refer service section 6.4.8)
Replace.
(Refer service section 6.3.5)
FAULT POSSIBLE CAUSE REMEDY
60 MINUTE TIMER NO TIME UP INDICATOR
NO TEMPERATURE CONTROL (TEMPERATURE OVERRUN)
SLOW RECOVERY Oven in ‘Roast ‘n Hold’ mode.
Timer not switching on buzzer.
(Refer fault diagnosis 6.1.9)
Indicator faulty.
(Refer fault diagnosis 6.1.10)
Thermostat faulty. (Refer fault diagnosis 6.1.11)
Overloading of oven.
Fan not working.
Thermostat out of calibration.
(Refer fault diagnosis 6.1.12)
Low gas pressure.
Blocked burner orifice.
Incorrect gas type.
Replace.
(Refer service section 6.3.7)
Replace. (Refer service section 6.3.3)
Replace. (Refer service section 6.3.9)
Switch off ‘Roast ‘n Hold’.
Reduce oven loading.
Check fan operation.
Correct calibration. (Refer service section 6.4.2)
Check and adjust.
(Refer section 2: Installation for correct setting procedure)
Clean.
(Refer service section 6.3.21)
Check appliance gas type.
NO THERMOSTAT HEATING INDICATOR
ROAST TIMER (180 MINUTE) WILL NOT TIME DOWN
NO HOLD INDICATOR
HOLDING TEMPERATURE INCORRECT
Indicator faulty.
(Refer fault diagnosis 6.1.13)
Roast ’n’ Hold switch not de­pressed.
No power to timer / timer faulty. (Refer fault diagnosis 6.1.14)
‘Roast ‘n Hold’ switch faulty. (Refer fault diagnosis 6.1.14)
Faulty indicator. (Refer fault diagnosis 6.1.15)
Faulty timer. (Refer fault diagnosis 6.1.15)
Hold thermostat set tempera­ture incorrect.
Hold thermostat faulty. (Refer fault diagnosis 6.1.16)
Replace. (Refer service section 6.3.3)
Depress switch. Switch will illuminate.
Correct electrical fault / replace timer. (Refer service section 6.3.8)
Replace. (Refer service section 6.3.4)
Replace.
(Refer service section 6.3.3)
Replace. (Refer service section 6.3.8)
Adjust to correct temperature. (Refer service section 6.4.7)
Replace.
(Refer service section 6.3.10)
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FAULT POSSIBLE CAUSE REMEDY
DOOR DOES NOT CLOSE Tray in way of door.
Door seal obstruction.
Door handle installed incorrectly.
Door catch setting incorrect.
Door pivot bushes / pins worn.
DOOR SEAL LEAKS
Door seal damaged.
Door seal incorrectly fitted.
Door catch setting incorrect.
Door pivot bushes / pins worn.
Door catch striker plate worn.
Correctly position tray in rack.
Correctly install door seal.
(Refer service section 6.3.25)
Fit correctly. (Refer installation section)
Adjust.
(Refer service section 6.4.5)
Replace.
(Refer service section 6.3.26)
Replace. (Refer service section 6.3.25)
Correctly install door seal.
(Refer service section 6.3.25)
Adjust.
(Refer service section 6.4.5)
Replace.
(Refer service section 6.3.26)
Replace.
(Refer installation instructions—Door handle installation)
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6. SERVICE PROCEDURES
WARNING: ENSURE POWER SUPPLY IS SWITCHED OFF BEFORE SERVICING.
WARNING: ALL INSTALLATION AND SERVICE REPAIR WORK MUST BE CARRIED OUT BY QUALIFIED PERSONS ONLY.
SECTION PAGE NO.
6.1 FAULT DIAGNOSIS .............................................................................................................24
6.1.1 Oven Does Not Operate / Start ...........................................................................24
6.1.2 No Heat / Burner Not Working.............................................................................24
6.1.3 Burner Noisy (Burner Blowback / Backfire) .........................................................28
6.1.4 Fan Does Not Operate ........................................................................................28
6.1.5 Oven Light Not Illuminating—Door Open ............................................................28
6.1.6 Oven Light Not Illuminating—Door Closed ..........................................................28
6.1.7 No Water Injection / Steam..................................................................................28
6.1.8 Continuous Water Out Of Oven Water Nozzle ....................................................29
6.1.9 60 Minute Timer No Time Up Buzzer ..................................................................29
6.1.10 60 Minute Timer No Time Up Indicator................................................................29
6.1.11 No Temperature Control (Temperature Overrun)................................................29
6.1.12 Slow Recovery.....................................................................................................29
6.1.13 No Thermostat Heating Indicator.........................................................................29
6.1.14 Roast Timer (180 Minute) Will Not Time Down ...................................................30
6.1.15 No Hold Indicator.................................................................................................30
6.1.16 Holding Temperature Incorrect............................................................................30
6.2 ACCESS ...............................................................................................................................31
6.2.1 Control Panel.......................................................................................................31
6.2.2 Service Panel (Side Panel)..................................................................................31
6.2.3 Service Panel (Rear Panels) ...............................................................................31
6.2.4 Burner Access Panel ...........................................................................................31
6.2.5 Manual Isolating Valve / Gas Control Valve Access Panel .................................31
6.2.6 Control Panel (Rear)............................................................................................32
6.3 REPLACEMENT ...................................................................................................................32
6.3.1 Lamp Bulb / Glass ...............................................................................................32
6.3.2 Door Microswitch .................................................................................................32
6.3.3 Indicator Neon Light ............................................................................................32
6.3.4 Power / Roast / Lights / Water Switches .............................................................33
6.3.5 Buzzer .................................................................................................................33
6.3.6 Hold Relay ...........................................................................................................33
6.3.7 Bake Timer ..........................................................................................................33
6.3.8 Roast Timer .........................................................................................................34
6.3.9 Thermostat ..........................................................................................................34
6.3.10 Hold Thermostat ..................................................................................................35
6.3.11 Water Solenoid ....................................................................................................35
6.3.12 Water Solenoid Cleaning ....................................................................................35
6.3.13 Spray Nozzle .......................................................................................................35
6.3.14 Fan ......................................................................................................................36
6.3.15 Motor ...................................................................................................................36
6.3.16 Overtemp (UK Units Only)...................................................................................36
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6.3.17 24 Volt Transformer (USA/Canada Units Only)...................................................36
6.3.18 Ignition Box..........................................................................................................37
6.3.19 Ignition Electrodes ...............................................................................................37
6.3.20 Gas Control Valve ...............................................................................................37
6.3.21 Burner Injector .....................................................................................................38
6.3.22 Burner..................................................................................................................38
6.3.23 Outer Glass .........................................................................................................38
6.3.24 Inner Glass ..........................................................................................................39
6.3.25 Door Seals...........................................................................................................39
6.3.26 Door Pivot Bushes ...............................................................................................39
6.3.27 Stainless Steel Door Outer Glass........................................................................39
6.3.28 Stainless Steel Door Inner Glass.........................................................................40
6.4 ADJUSTMENT / CALIBRATION ..........................................................................................40
6.4.1 Regulator Adjustment ..........................................................................................40
6.4.2 Thermostat Calibration ........................................................................................40
6.4.3 Confirming Overtemp Thermostat Calibration (UK Units Only) ...........................41
6.4.4 Door Microswitch Adjustment ..............................................................................41
6.4.5 Door Catch Adjustment .......................................................................................42
6.4.6 Door Alignment....................................................................................................42
6.4.7 Hold Temperature Adjustment.............................................................................42
6.4.8 60 Minute Timer Zero Position Adjustment .........................................................42
6.4.9 Burner Injector Alignment ....................................................................................42
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6.1 FAULT DIAGNOSIS
6.1.1 OVEN DOES NOT OPERATE / START
Incorrect electrical supply
Check that the voltage across phase and neutral (L1 and L2) terminals of terminal block is the voltage as stated on the unit’s electrical rating plate.
If incorrect, check electrical connection of supply wiring and / or check electrical supply.
Overtemp tripped (UK units only)
Open the control panel. Check for power at terminal 1 of power switch. If power at terminal 1 then overtemp is ok, refer “power switch faulty” (below).
WARNING: OVERTEMP BUTTON IS LIVE. ISOLATE UNIT FROM POWER SUPPLY BEFORE RESETTING.
If no power to terminal 1, inspect overtemp reset button (at rear of control cavity). If the overtemp has tripped then the reset button will have popped out, and will click when depressed. If the overtemp resets then a fault exists with the temperature control of the oven (check calibration, refer 6.4.2, or overtemp calibration is faulty, refer 6.4.3).
If the overtemp button cannot be reset, and the oven temperature is below 300°C (- overtemp will not reset above 300°C), then the overtemp is faulty - replace.
Power switch faulty
Check if power switch latches. If the switch does not latch, then switch is faulty—replace.
With switch latched, check voltage across terminal one to terminal three or four. If there is no voltage, check for fault in wiring.
Check voltage across terminal two to terminal three or four. If there is no voltage, then switch is faulty—replace.
NOTE:
6.1.2 NO HEAT/BURNER NOT WORKING
When power switch is latched, it
should illuminate if it is operating correctly.
problem is in the flame sensing, not spark ignition. Refer “Burner flame not being sensed” (following).
Firstly determine if spark is being generated. Remove the front service panel and turn the thermostat on to initiate a heating cycle. Look through the round viewing holes next to the electrode assembly, and look for spark generation at the end of the electrodes. If spark is heard but not visible, turn off/isolate gas supply, and remove electrode assembly.
With gas supply off, turn thermostat back on again with electrode assembly suspended in air. A correctly functioning ignition system should show sparking visible across spark and earth rod ends. If spark is not seen at electrode ends, or sparking is erratic, this indicates that there is a high voltage short/ breakdown between the ignition box and the electrode ends.
Possible causes to investigate are as follows, inspect and correct as necessary:
- Spark gap too large (see the following section).
- Cracked spark rod ceramic, or carbon build-up.
- HT leads to spark electrode and earth broken/deteriorated.
- HT leads between ignition electrodes and ignition control box broken/deteriorated.
- No spark from ignition box, refer ignition box faulty.
Spark gap setting
With spark electrode assembly removed, inspect spark rod and earth electrode settings, and spark gap settings - refer section 11.3 (select appropriate assembly type).
NOTE:
With spark system correctly checked, re-install into burner box and re-check operation.
If fault persists it is possible that the electrodes are out of position in relation to the burner flame. Adjustment may be necessary to set the electrode gap to the correct position (refer to following diagram).
Use drill bits to gauge spark gap
settings
Burner ignition spark not working
A faulty spark system is one that does not light the burner at all. If the burner is being lit temporarily, but fails to stay alight, then the
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