Moffat G32M Service Manual

G32MS CONVECTION OVEN

SERVICE MANUAL

Revision 4/F3590

APRIL, 2004

-1-

Manual P/N MOMG32MS

CONTENTS

This manual is designed to take a more in depth look at the G32M and G32MS convection ovens
for the purpose of making the units 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............................................................................................................ 8

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 (Not United Kingdom)

8. ELECTRICAL WIRING DIAGRAMS ............................................................................. 46

8.1 220-240V (United Kingdom Only)

8.2 100-120V (USA, Canada)

8.3 220-240V (Not United Kingdom)

9. SPARE PARTS ............................................................................................................. 49

IMPORTANT: MAKING ALTERATIONS MAY VOID WARRANTIES AND APPROVALS.

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10. ACCESSORIES / OPTIONS ......................................................................................... 51

11. PARTS DIAGRAM........................................................................................................ 52

11.1 Main Assembly

11.2 Control Panel Assembly

11.3 Gas Assembly

11.4 Gear Plate Assembly

11.5 Door Assembly

12. SERVICE CONTACTS ................................................................................................. 63

APPENDIX A. Ignition Box Specifications ......................................................................... 65

APPENDIX B. Double Stacking Kit (Kits manufactured from March 2004)..................... 66

APPENDIX C. Double Stacking Kit (Kits manufactured before March 2004).................. 68

APPENDIX D. Motor Replacement Kit ................................................................................ 68

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MODEL: G32M

1. SPECIFICATIONS

(28")

28"

710

(28") (32")

GAS

1

E

MWS

510

(20")

350

(13¾")

205

MWS

E

1

GAS

(8")

810

900

(35½")

50

FRONT

(2")

70

SIDE

(2¾")

(3½")

E

1

MWS

GAS

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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MODEL: G32MS

710

(28") (32")

GAS

1

1

E

E

MWS

MWS

510

(20")

350

(13¾")

205

1

MWS

E

GAS

(8")

50

(2")

FRONT

70

(2¾")

(3½")

E

1

MWS

810

SIDE

900

(35½")

GAS

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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GAS SUPPLY REQUIREMENTS

Natural Gas LPG Natural Gas - UK Propane - UK
(G20) (G31)

Input Rating 35 MJ/hr 35 MJ/hr 9.5 kW 9.5 kW
(N.H.G.C.) (33,000 Btu/hr) (33,000 Btu/hr) (0.91 m³/hr) (0.67 kg/hr)

Injector Size Ø2.80 mm

(no. 35 drill size)

Supply Pressure 1.13 kPa 2.75 kPa 20 mbar 37 mbar
(4½” w.c.) (11” w.c.)

Operating Pressure 0.85 kPa 2.25 kPa 10 mbar 35 mbar
(3.5” w.c.) (9.0” w.c.)

Gas Connection ½” BSP Female ½” BSP Female

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”

* Fixed installations require at least 500mm

(20”) clearance at the right hand side for
service accessibility.

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”

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
220-240 V AC, 60 Hz, 0.7 A, 1 Phase

½” NPT Female (USA/Canada only)

Ø1.80 mm

(no. 50 drill size)

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

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.

NOTE:

ignition control specifications.

Ø2.60 mm Ø1.55 mm

Refer to Appendix A for further

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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 addition, in accordance with relevant
National / Local codes covering gas and fire
safety.

UNITED KINGDOM
GAS SAFETY (Installation & Use)

- REGULATIONS 1984 Amendment 1990)

AUSTRALIA
AS5601 / AG601 - 2000, Gas Installations

NEW ZEALAND
NZS5261, Installation of Burning

Appliances and Equipment

UNITED STATES
ANSI 223.1 (Latest edition) National Gas

Fuel Code

CANADA
CAN/CGA -B149, Installation Codes for

Gas Burning 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 0.5 psi
(3.45 kPa / 34.5 mbar).

This oven must be electrically grounded in
accordance with local codes.

Before Connection to the Power and Gas
Supplies

• Remove all packing.

• Check equipment and parts for damage.

• Remove protective plastic coating from

• Check that the following parts have been

Report any damage immediately to the
carrier and distributor.

the side panels.

supplied with your oven:

4 x Leg assembly
4 x Oven racks
1 x Water inlet elbow (c/w washer)

• Report any deficiencies to the distributor
who supplied the oven.

• Fit the legs to the oven.

• Check that the available power and gas
supply is correct to that shown on the
rating plate located on the right -hand side
panel.

Location

• This oven must be installed in an area of
adequate air supply. To ensure correct
ventilation for the motor and controls the
following minimum installation clearances
are to be adhered to:

Rear 75mm / 3”
Left-hand side 75mm / 3”
Right-hand side* 75mm / 3”
Top 200mm / 8”

* Fixed installations require at least

500mm (20”) clearance at the right
hand side for service accessibility.

• This oven must be fitted on supplied legs
in all installations.

• Position the oven in its working position.

• Use a spirit level to ensure oven is level
from side to side and front to back. (If this
is not carried out, uneven cooking could
occur). The legs used with bench/floor
mounting or provided with stands are
adjustable and will require adjusting in
levelling the unit.

• The unit should be positioned such that
the operating panel and oven shelves are
easily reachable for loading and
unloading.

• Adequate ventilation is essential. DO
NOT obstruct the air flow around the
ventilation slots.

IMPORTANT: THE OVEN VENT

LOCATED ON THE CABINET TOP
MUST NEVER BE OBSTRUCTED.

Electrical Connection

This oven is fitted with an approved power
supply cord via an electrical junction box at
the right hand rear of the unit. Should

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changing of the cord be necessary then follow
the instructions given below:

• Remove right hand side panel to allow
access to the terminal block and strain
relief cable clamp.

• The cable can be fitted through the small
grommet and held by the cable clamp.

• Connect cable to the terminals as
marked, then refit the cover panel.

L1 L2

Phase

RED

BROWN

BLACK

WARNING:

Neutral

BLACK

BLUE

WHITE

THIS APPLIANCE MUST

BE GROUNDED / EARTHED

Ground

GREEN

GREEN/YELLOW

Figure 2.1

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 ½” 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.

Gas Connection

• A ½" BSP female elbow (½" N.P.T
female - USA / Canada only) is provided
at the bottom rear of the oven.

• 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 the break down action of LPG
must be used on every gas connection.

• Check all connections for leakages.

• Check appliance name plate on oven right
hand side 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. Adjust the regulator
to achieve stated pressure.

NOTE:

Pressure test points are located

behind this side service panel also
at bottom right side of oven.

IMPORTANT: ENSURE MANUAL
ISOLATING VALVE LOCATED ON RIGHT
HAND SIDE OF OVEN BEHIND GAS
CONTROL SERVICE PANEL IS OPENED
FOR OPERATION.

Before Use

• Operate the oven for about 1 hour at
200°C (400°F) to remove any fumes or
odours which may be present.

Lighting Instructions

• Set the thermostat temperature.

• Automatic ignition will light the burner.

• If not, turn the thermostat off, and wait 5
minutes before relighting.

• The burner will cycle on/off to maintain the
set temperature.

• Turn the thermostat off to shut-down the
burner.

NOTE:

If the burner is not cycling to maintain
temperature the ignition system has locked
out. To reset turn the thermostat to the ‘off’
position. Wait 5 minutes before relighting.

110 Volt Models (24 Volt ignition system)

If the flame is lost during operation the ignition
system will try three times to re-establish the
flame with a 30 second delay between each

try, before going into lockout

.

220-240 Volt Models

If the flame is lost during operation the ignition
system will try once to re-establish the flame,
and will go into lock-out condition if there is a
re-ignition failure.

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RATING PLATE LOCATION

Units manufactured from July 2002.

The rating plate for the G32M and G32MS
convection ovens is located on the RH side
front bottom corner.

Rating
Plate

Figure 2.2

Units manufactured up to July 2002.

The rating plate for the G32M and G32MS
convection ovens is located at the rear of the
RH side panel.

Figure 2.3

Rating
Plate

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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

2

5

6

7

3

4

1. Power

Depress to switch power on or off (switch

illuminates when power is on).

2. Thermostat

Temperature range 50 - 320°C (120 - 600°F).
Indicator illuminates when the burner is

cycling ON to maintain set temperature.

3. Bake Timer

1 Hour bake timer.
Indicator illuminates when “time up” (0)

reached, and buzzer sounds.

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. Product is 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 is latched in the

down position).

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3.2 EXPLANATION OF CONTROL
SYSTEM

The G32M and G32MS Turbofan convection
ovens feature 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, the temperature
control circuit, and the fan motor. The oven
circulation fan will continuously run whenever
the oven is switched on. The control panel
light switch will turn the oven lights on when
the door is closed. 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
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 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 G32M and G32MS Turbofan ovens have
an 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:

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

On 110 volt models the ignition

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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:

have different ignition sequence and
re-ignition specifications. Refer to appendix A
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 G32M and G32MS Turbofan convection
ovens feature a Roast-and-Hold system which

Different voltage and market models

can be used to automatically set the oven to a
fixed holding temperature at the end of a
timed cooking period. When the Roast-and­Hold 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
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).

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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

BURNER PRESSURE Check that the unit is operating at the correct operating

pressure.

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 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)

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

60 MINUTE TIMER NO TIME
UP INDICATOR

With oven on only—Electrical
fault.

(Refer fault diagnosis 6.1.8)

With oven on or off - water
valve faulty or requires
cleaning.

Timer faulty.

Timer not set correctly.

Zero (time up) position not set
correctly.

Buzzer faulty.

(Refer fault diagnosis 6.1.9)

Timer not switching on buzzer.

(Refer fault diagnosis 6.1.9)

Indicator faulty.

(Refer fault diagnosis 6.1.10)

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)

Replace.

(Refer service section 6.3.7)

Replace.
(Refer service section 6.3.3)

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FAULT POSSIBLE CAUSE REMEDY

NO TEMPERATURE
CONTROL (TEMPERATURE
OVERRUN)

SLOW RECOVERY Oven in ‘Roast ‘n Hold’ mode.

NO THERMOSTAT HEATING
INDICATOR

ROAST TIMER (180 MINUTE)
WILL NOT TIME DOWN

NO HOLD INDICATOR

HOLDING TEMPERATURE
INCORRECT

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.

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 6.3.9)

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.

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) .........................................................27

6.1.4 Fan Does Not Operate ........................................................................................27

6.1.5 Oven Light Not Illuminating—Door Open ............................................................27

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 ....................................................28

6.1.9 60 Minute Timer No Time Up Buzzer ..................................................................28

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 ...................................................29

6.1.15 No Hold Indicator.................................................................................................30

6.1.16 Holding Temperature Incorrect............................................................................30

6.2 ACCESS ...............................................................................................................................30

6.2.1 Control Panel.......................................................................................................30

6.2.2 Service Panel (Side Panel)..................................................................................30

6.2.3 Burner Access Panel ...........................................................................................31

6.2.4 Manual Isolating Valve / Gas Control Valve Access Panel .................................31

6.2.5 Control Panel (Rear)............................................................................................31

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 .............................................................32

6.3.5 Buzzer .................................................................................................................32

6.3.6 Hold Relay ...........................................................................................................33

6.3.7 Bake Timer ..........................................................................................................33

6.3.8 Roast Timer .........................................................................................................33

6.3.9 Thermostat ..........................................................................................................33

6.3.10 Hold Thermostat ..................................................................................................34

6.3.11 Water Solenoid ....................................................................................................34

6.3.12 Water Solenoid Cleaning ....................................................................................34

6.3.13 Spray Nozzle .......................................................................................................35

6.3.14 Fan ......................................................................................................................35

6.3.15 Motor ...................................................................................................................35

6.3.16 Overtemp (UK Units Only)...................................................................................35

6.3.17 24 Volt Transformer (USA/Canada Units Only) ...................................................36

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