Rinnai E- Series Troubleshooting Manual

There are a number of live tests that are required when fault finding this product. Extreme care should be used

If any of the

original wire as supplied with the appliance must

Label all wires prior to disconnection when

CAUTION

E- Series Boiler

Troubleshooting Manual

WARNING

at all times to avoid contact with energized components inside the product.

You MUST be a qualified service person before proceeding with these test instructions.

Before checking resistance readings, turn off power source to unit and then isolate each item to be checked from the circuit by unplugging it.

When setting gas pressures on one of these units, please check the complete model number you are troubleshooting. Gas pressures and dip switches can vary among models. Always check the rating plate for complete information and follow directions.

servicing controls. Wiring errors can cause improper and dangerous operation.

be replaced, it must be replaced with type 18 AWG wire or its equivalent.

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Table of Contents

Code Numbers Page #

Boiler Description …………………………………………………………………………………………………………………………. 4

Error indication (Short reference) ………………………………………………………………………………………………... 5

BL 01 …………………………………………………………………………………………………………………………………………….. 6

BL 05 …………………………………………………………………………………………………………………………………………….. 7

BL 11 …………………………………………………………………………………………………………………………………………….. 8

BL 12 …………………………………………………………………………………………………………………………………………….. 9

BL 60 …………………………………………………………………………………………………………………………………………….. 10

BL 67 …………………………………………………………………………………………………………………………………………….. 11

BL 80 …………………………………………………………………………………………………………………………………………….. 12

BL 81 …………………………………………………………………………………………………………………………………………….. 13

BL 82 …………………………………………………………………………………………………………………………………………….. 14

BL 84 …………………………………………………………………………………………………………………………………………..… 15

BL 85 …………………………………………………………………………………………………………………………………………….. 16

BL 86 …………………………………………………………………………………………………………………………………………..… 17

E 00 ………………………………………………………………………………………………………………………………………………. 18

E 01 ………………………………………………………………………………………………………………………………………………. 19

E 02 …………………………………………………………………………………………………………………………………………….… 20

E 03 …………………………………………………………………………………………………………………………………………….… 21

E 04 …………………………………………………………………………………………………………………………………………….… 22

E 05 …………………………………………………………………………………………………………………………………………….… 23

E 07 …………………………………………………………………………………………………………………………………………….… 24

E 11 …………………………………………………………………………………………………………………………………………….… 25

E 12 …………………………………………………………………………………………………………………………………………….… 26

E 13 …………………………………………………………………………………………………………………………………………….… 27

E 14 …………………………………………………………………………………………………………………………………………….… 28

E 18 …………………………………………………………………………………………………………………………………………….… 29

E 19 …………………………………………………………………………………………………………………………………………….… 30

E 24 …………………………………………………………………………………………………………………………………………….… 31

E 26 …………………………………………………………………………………………………………………………………………….… 32

E 28 …………………………………………………………………………………………………………………………………………….… 33

E 29 …………………………………………………………………………………………………………………………………………….… 34

E 31 ……..……………………………………………………………………………………………………………………………………….. 35

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E 32 ….…………..……………………………………………………………………………………………………………………………… 36

E 36 ....…..……………………………………………………………………………………………………………………………………… 37

E 37 …..…………….………………………………………………………..……………………………………………………………….... 38

E 41 …………………………………………………………..…………………………………………………………………………..……… 39

E 42 …………………………………………………………………………………………………………………………………………..….. 40

E 44 ………………………………………………………………………………………………………………………………………………. 41

E 68 ………………………………………………………………………………………………………………………………………………. 42

E 69 ………………………………………………………………………………………………………………………………………………. 43

E 80 ………………………………………………………………………………………………………………………………………………. 44

E 115 …………………………………………………………………………………………………………………………………………….. 45

Fuse …………………………………………………………………………………………………………………………………………….… 46

Central heating but no domestic hot water…………………………………………………………………………………… 47

Hot water but no central heating …………………………………………………………………………………………….…... 47

Central heating installation gets hot without being requested ……………………………………………….…... 47

Insufficient quantity of hot water …………………………………………………………………………………………….…... 48

Temperature drop of the DHW (Combi) ……………………………………………………………………………………….. 48

Radiators do not get hot enough or warming up takes too long …………………………………………………... 48

Checking the 02 …………………………………………………………………………………………………………………………….. 49

Boiler Controls ………………………………………………………………………………………...…………………………………... 50

Explanation of the function buttons ……………………………………………………………………………………..…….… 51

Starting up – filling and de-aerating the boiler & Water Requirements….………………………………….….. 52

Freeze Protection………………………………………………………………………………………………………………………….. 53

Filling the heating system ………………………………………………………………………………………………………..…... 54

Altering adjustments ……………………………………………………………………………………………………………………. 55 PARAMETER mode ………………………………………………………………………………………………………………………. 56

Information, Service and Error Modes …………………………………………………………………………………………. 57

Activating factory setting (Green button function) ………………………………………………………………………. 58

Isolating the boiler ……………………………………………………………………………………………………………………..….59

Reset service interval counter ……………………………………………………………………………………………………… 60

Toll-Free:1-800621-9419 • Phone: 678-829-1700 • www.rinnai.us

Rinnai is continually updating and improving products; therefore, specifications are subject to change without

prior notice. Local, state, provincial and federal codes must be adhered to prior to and upon installation.

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Bi-metal high

Parts of the Boiler

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A detected error is indicated on the display by means of a blocking or error messages. A distinction should be made between

Block 67: A ∆T has been detected between flow and the return sensor whereas the burner is not in operation. After the

Flame present when burner is off, electrical interference, poor

Block and Errors

- Error indication (short reference)

these two messages due to the fact that a blocking code can be of a temporary nature, however, error messages are fixed “lockouts” or hard lockouts. The control will try its utmost to prevent a lockout and will temporary switch off the unit by blocking it, below is a list of some messages the unit will display.

Blocks: bL with a number in the last two positions indicates the type of blocking code.

bL 01 Block 01: External safety contact cut off. bL 05 Block 05: Outdoor reset sensor not connected. bL 60 Block 60: Incorrect parameter setting of the minimum or maximum power (Btu) of boiler. bL 67

∆T has disappeared the block will clear itself.

bL 85 Block 85: The control has not detected water flow. The venting cycle (pro-purge) cycle has started.

If during this cycle water flow is detected, the pro-purge cycle stops, the burner will then fire up.

Error: E with a number in the last two positions indicates the type of error code.

E 00 Error 00: Poor flame forming. E 02 Error 02: No flame forming. E 04 Error 04: Adjustment or error due to voltage interruption. E 05 Error 05: Adjustment. E 12 Error 12: High limit stat. E 18 Error 18: Maximum flow temperature exceeded. E 19 Error 19: Maximum return water temperature exceeded. E 28 Error 28: Fan revolutions not being measured by control board.

ground, and flame sensing wire disconnected during off cycle.

E 69 Error 69: No or incorrect display. FUSE FUSE: 24 V fuse defective or blown.

Information displayed in “Tech Readout Mode”. To enter this mode press and hold the “STEP” button for 5 seconds.

Operation Indication 0 - No heat demand 1 - Fan pre/post purge 2 - Ignition phase 3 - Burner active on central heating 4 - Burner active on DHW 5 - Fan check 6 - Burner off when either DHW or room thermostat is calling * (See note 2 below). 7- Pump overrun phase for central heating 8- Pump overrun phase for hot water 9 - Burner off because of too high flow temperature A - Automatic de-aeration program

F – Fan test still activated in Service mode H Burner test still activated in Service mode

*Note 2; (E Boiler) a continuous code 6 can mean there is a small hot water leak triggering the plate heat exchanger sensor to call continually for DHW in turn locking out space heating in DHW priority. Switch PARA 36 to 20 (flow switch only) and then repair leak.

NOTE; if the unit appears to be fine but doesn’t run and no error code is displayed check;

a. That the desired programming is on; set to

either Central Heating and/or Domestic Hot Water.

b. The unit is not in the Showroom Mode

______________________________________ Explanation of T Sensors:

T1- Supply sensor - Water leaving heat exchanger mounts in flow of water.

T2 - Return water sensor, surface mounted.

T3 - Domestic hot water flow sensor,. Q175C uses a surface mount sensor. Q models with optional 3-way valve use a sensor designed to be used in a well. (QP uses a well)

T4 – Outdoor reset sensor, mounted outside building.

T5 - Flue gas sensor - Optional sensor not included with boiler.

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The 120 volt external pump is for E and QP model boilers

WARNING: Turn off power supply before installing jumper. Rectify error by determining which external contact is open. If external contacts are not being used place jumper across terminals 24 & 25



If multiple boiler safeties are to be wired in series check with your local inspector or the local or State codes to see if this is allowed in your area before proceeding. NEVER wire boiler safeties in parallel.

Refer to wiring diagram in the boiler manual. Trace connections 24 and 25 above back to the MCBA. These will be located on Plug X5 on the MCBA on pins 2 and 6.

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Maximum average ΔT of T1 supply

BL 11

operate at minimum capacity during the block.

Rectify Issue,

sensor and T2 return sensor for central heating is repeatedly exceeded.

Operation is normally possible for the hot water supply during the block. The pump continues to

Check following

1. Check flow through the heating system.

2. Possible causes: radiator shut off valves closed, blocked water filter.

3. Verify proper installation of the boiler plumbing, connections and all components.

4. Check minimum and maximum temperature difference in Parameter step 46 and 47.

5. Activated room sensor (RS100) in non leading room (closed thermostatic radiator valves?) Check pump height. Should this be check pump head? Do not understand

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Maximum average ΔT of supply

BL 12

continues to operate at minimum capacity during

Rectify Issue,

sensor and return sensor for hot water is repeatedly exceeded.

Operation is normally possible for the central heating installation during the block. The pump

Check following

1. Check flow through the boiler and DHW tank.

2. Possible causes: radiator shut off valves closed, blocked water filter, restriction in DHW tank to high.

3. Verify proper installation of the boiler plumbing, connections and all components.

4. Ensure 3 way valve is functioning properly and is not clogged or full of pollution.

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NOTE; in order to reset all parameters in your boiler back to factory defaults follow the “Activating Factory Settings” (Green button function) instructions found in your owner’s manual. CAUTION: All parameters you adjusted will now have to be reprogrammed if the bL60 code clears up. If after resetting the boiler the bL60 still appears, you will need to replace the sub-PC board and reprogram the MCBA. The sub PC board must be from a conversation kit for the same gas type as your boiler.

WARNING: Before replacing the sub PC board or installing a conversion kit turn off the gas and electrical supply to the boiler.

If conversion parts are not locally accessible contact Rinnai Tech Support for assistance. These parameters cannot be accessed in the field and may require special instructions in an emergency situation.

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A temperature difference has been detected

A temperature difference has been detected between the supply T1 sensor and the return T2

between the supply and return sensor while

sensor while the burner is not in operation. After

the burner is not in operation. After the

the average ΔT has disappeared, the blocking

average ΔT has disappeared, the block will

code will go away.

disappear.

Check the supply T1 sensor and the return T2 sensor for the proper resistance valve. Replace if found to be defective. WARNING: Turn off power and water supply to boiler before removing the T1 or T2 sensor.

T1 Sensor

T2 Sensor

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T5 sensor is registering too high of a

and installed on the boiler.

temperature. This error can only occur if the optional T5 sensor is was purchased

This is the location of the T5 sensor if installed. If the red tab is in place this sensor was never installed, which means the circuit has somehow been jumped out. Contact Rinnai tech support for assist if you get the bL80 without the T5 sensor being installed.

Inspect vent system and all air passages ways for blockage

212˚F is the default temperature setting for parameter 84. Verify to see if the temperature setting for this parameter is set higher than the default. If so, inspect vent system for blockage. CAUTION: ensure all vent components are properly seated when reinstalled.

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Explanation: The bL81 can be triggered if the flue gas plug has gotten wet and then dried out. (MCBA sees resistance when wet and then sees no resistance when dry) This tricks the MCBA into thinking that a flue gas sensor was installed and then removed in which the bL 81 is triggered. Moisture can come from a clog, broken or dry condensate trap. Moisture can be from a leaking concentric vent pipe or from driving rain during extreme weather.

WARNING: Turn off power and water supply to the boiler before removing or installing any parts.

Methods to rectify:

A. ORDER AND INSTALL A FLUE GAS SENSOR (This may not be possible in cold weather when boiler must operate

immediately, if shipping the part is required.

B. CHANGE PARA 80 TO 20 AND INSTALL LOW VOLTAGE JUMPER ON FLUE GAS PLUG - (plug located on upper left hand side

of the heat exchanger in the harness) (PARA 20 setting causes the MCBA to look for an open/ close circuit and ignores any variable resistance values like moisture or a thermistor.

C. INSTALL A 10K OHM RESISTOR ACROSS FLUE GAS TERMINALS. This will make the MCBA think that the flue gas is at a safe

temperature level (90 F)

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Flue sensor

Explanation: The bL81 can be triggered if the flue gas plug has gotten wet and then dried out. (MCBA sees resistance when wet and then sees no resistance when dry) This tricks the MCBA into thinking that a flue gas sensor was installed and then removed in which the bL 81 is triggered. Moisture can come from a clog, broken or dry condensate trap. Moisture can be from a leaking concentric vent pipe or from driving rain during extreme weather.

WARNING: Turn off power and water supply to the boiler before removing or installing any parts.

Methods to rectify:

D. ORDER AND INSTALL A FLUE GAS SENSOR (This may not be possible in cold weather when boiler must operate

immediately, if shipping the part is required.

E. CHANGE PARA 80 TO 20 AND INSTALL LOW VOLTAGE JUMPER ON FLUE GAS PLUG - (plug located on upper left hand side

of the heat exchanger in the harness) (PARA 20 setting causes the MCBA to look for an open/ close circuit and ignores any variable resistance values like moisture or a thermistor.

F. INSTALL A 10K OHM RESISTOR ACROSS FLUE GAS TERMINALS. This will make the MCBA think that the flue gas is at a safe

temperature level (90 F)

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212˚F is the default temperature setting for parameter 84. Verify to see if the temperature setting for this parameter is set higher than the default. If so, inspect vent system for blockage.

This can occur when PARA 84 has been changed to 20 and the field installed jumper is loose or removed.

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AIR: if boiler, inner boiler piping, or Low Loss Header has a large air bubble in it the pressure sensor will not see the pressure spike that the pump generates when it starts. The pressure spike is what tells the MCBA that the pump has started. The air bubble will absorb that spike. Bleed all

air from the system.

If an additional expansion tank is placed in the system alongside an E-boiler that tank can absorb the pump pressure spike as well. You may need to isolate that tank to see if this corrects the issue with BL 85.

An expansion that is not charged properly can cause the pump’s pressure spike not to be seen by the sensor causing a BL85.

Expansion tank pressure should be air charged to match whatever water fill pressure that is chosen for the closed loop. (Always above

14.5 psi)

Expansion tanks must be air charged only when there is no water pressure on the wet side of the diaphragm or the tank is removed from the system. Once charged to the correct air pressure it may be placed into the system and the water fill pressure now may be set to match the new tank pressure.

Check the installation for the presence of air. If there is a secondary pump installed and it is not hydraulically separated, it could cause a loss of pressure difference.

Check to ensure the pump is functioning and/or water pressure sensor is working properly.

WARNING: Turn off power and water supply to the boiler before removing or installing any parts.

Ensure water pressure sensor is not clogged or defective. Inspect water filter for debris. Check pump for proper operation and flow rates. Check for proper wiring of pump. Check for use of balancing valves.

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The frequency of the power supply deviates more than + or - 1.5 Hz.

If using a back-up generator ensure it is properly grounded and providing a clean steady voltage and sign wave of 59.3 to 60.8 Hz.

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Boiler has not been

WARNING: Turn off power and water supply to the boiler before removing or installing any parts.

burning but an

ionization flow

(flame) has been

detected.

Check whether the ionization cable and/or the electrode are responsible for a short circuit. Remove the plugs from the ionization cable connected to the control unit and to the electrode. Now using a ohm meter take a measurement between the ionization connection and the ground. Now refit it part by part until a short circuit takes place.

NOTE: Inadvertently unplugging the ionization cable or spark igniter wire while the boiler is not firing can trigger the E00 code.

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24 volt short circuit

E 01

Remove all 24 volt connectors, such as: fan, pump, any three port valve and the 24 volt plug to the connecting block. Check for a short circuit in the disconnected components. Next; switch on power to the control board with all the 24 volt components disconnected. Reconnect the components one at a time, if code E 01 appears when you plug up a component, that component has a short circuit. Rectify any short circuits or replace defective component causing short circuit.

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ignition

Ionization flow,

Flame Failure

Issue

WARNING: Turn off power and water supply to the boiler before removing or installing any parts. If checking gas pressures you MUST be qualified gas technician to service the gas system on this appliance.

Ignition Failure Issue

ionization cable or 02 setting

Due to insufficient ionization the burner has shut down after

The minimum ionization current should be 4 micro amps (Check INFO step 48, the O2 should be a minimum of 4.4% for NG or 4.8% for LP.

Note: if ionization is lost while the flame is burning no E02 will occur - unit will attempt to relight 6 times. E02 only occurs after 6 failed

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attempts for re-ignition.

Propane gas with low BTU value or a brand new tank that may contain something other than pure propane may cause E02. Check against a good known source of gas.

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WARNING: Turn off power and water supply to the boiler before removing or installing any parts. If checking gas pressures you MUST be qualified gas technician to service the gas system on this appliance.

Check for 24 volts DC at gas valve.

Check across terminals 4 and 5 at plug X5 on the main control board. See wiring diagram for your boiler for terminal locations

Control unit error - Connector not plugged into the gas valve or defect in the wiring harness to the gas valve.

In some cases an E03 is caused from a loose connection on wires to the gas valve. This faulty connection may be in the Molex plug (X5) on the MCBA. Examine plug closely for bayonets that may have backed out of plastic casing.

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interference is no longer present, this message is

WARNING: Turn off power and water supply to the boiler before removing or installing any parts. If checking gas pressures you MUST be qualified gas technician to service the gas system on this appliance.

The boiler automatically indicates this message if during an error read-out the electrical power to

The boiler automatically indicates this message if

the boiler is shut off. After the power is once again

during an error read-out the electrical power to

switched on, if the error causing the interference is

the boiler is shut off. After the power is once

no longer present, this message is given

again switched on, if the error causing the

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If error persist

WARNING: Turn off power and water supply to the boiler before removing or installing any parts. If checking gas pressures you MUST be qualified gas technician to service the gas system on this appliance.

after reset

Software error control unit, replace control unit. Remove the E-Prom from the defective control unit and place it onto the new control. The controller will automatically load the program into the new control unit.

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WARNING: Turn off power and water supply to the boiler before removing or installing any parts. If checking gas pressures you MUST be qualified gas technician to service the gas system on this appliance.

Replace the control unit. Remove the E-Prom from the defective control unit and place onto the new control. The controller will automatically load the program into the new control unit.

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WARNING: Turn off power and water supply to the boiler before removing or installing any parts. If checking gas pressures you MUST be qualified gas technician to service the gas system on this appliance.

Check E-Prom to ensure it has no damaged pins and it is properly connected.

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WARNING: Turn off power and water supply to the boiler before removing or installing any parts.

VERY RARE THAT AIR IS AT FAULT. If air is present it will be indicated by a gurgling noise. Normally when an airlock is

Clean the pump and/or filter when necessary. Flush complete system

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WARNING: Turn off power and water supply to the boiler before removing or installing any parts. If checking gas pressures you MUST be qualified gas technician to service the gas system on this appliance.

Replace the control unit. Remove the E-Prom from the defective control unit and place onto the new control. The controller will automatically load the program into the new control unit.

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- T3 flow sensor ground connection

WARNING:

Turn off power and water

supply

to the boiler before removing or installing any parts.

T3 flow sensor failure or controller failure

To determine flow temperatures for T3 use the chart to the

left for proper resistance values for a set temperature.

When no discrepancies are found on the sensors it may be a leakage of current coming in from an end switch or pump relay box connected to terms 22 and

23. Install isolating relay on 22 and 23 or replace faulty end switch / or pump relay box connected to

T3 Sensor is located behind the condensate trap on the E series boiler; this will look different on Q and QP boilers. This is a close up of the T3 sensor with the condensate trap removed.

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T1 Sensor

Actual flow

determined.

WARNING:

Turn off power and wat

er s

upply

to the boiler before removing or installing any parts.

Check actual flow

temperature should be

temperature

verified before T1 is

Signal maximum flow water temperature exceeded (T1 ˃ 212⁰F).

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WARNING: Turn off power and water supply to the boiler before removing or installing any parts

Signal maximum return water temperature exceeded (T2 ˃ 212⁰F).

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T2 Sensor located under T1 sensor

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T1

WARNING:

Turn off power and water

supply

to the boiler before removing or installing any parts.

and

T2 (swapped).

T2 temperature is measured to be higher than T1. Check resistance value of T1 and T2 (See resistance chart under error 19 for resistance values. Replace T! and/or T2 if found to be defective.

T1 Pressure Transducer

T2 sensor

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WARNING: Turn off power and water supply to the boiler before removing or installing any parts. If checking gas pressures you MUST be qualified gas technician to service the gas system on this appliance.

Replace MCBA board, main board.

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No feedback signal from fan motor.

WARNING:

Turn off power

s

upply

to the boiler before removing or installing any parts.

Check the wiring harness to the fan motor and control unit. Check power supply to motor during combustion process, should be 24 volts DC.

Fan

motor

wiring harness

constant 24 volts DC.

Tachometer cable Feedback signal

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according to the installation

instructions.

There is a negative pressure on vent system (Pressure

WARNING:

Turn off power

to the boiler before removing or installing any parts

difference). Check to see if fan motor is spinning.

Vent system and air intake must be installed

The E29 is triggered immediately after fan check code 5 during the starting sequence. If during fan check 5 the fan remains spinning more than 150 rpms an E29 will occur.

Causes:

- Wind driving into a concentric terminal. Replace with 90 degree terminal or for best results

use a roof terminal.

- Venting running a long distance in a cold attic space causing a thermo syphon after fan check.

Use room air for combustion if conforming to NFPA 111 guidelines for room air or use concentric terminal directly through the roof.

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Internal shut down of supply sensor T1.

WARNING:

Turn off power and water

supply

to the boiler before removing or installing any parts.

T1 sensor short circuit is indicated by low ohm reading. Replace defective sensor, see resistance values in chart on E 18 above.

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T1 Sensor

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Shut down of return sensor T2,

WARNING:

Turn off power and water

supply

to the boiler before removing or installing any parts.

T2 sensor short circuit is indicated by low ohm reading. Replace defective sensor. Refer to

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Contact for supply sensor T1 open,

WARNING:

Turn off power and water

supply

to the boiler before removing or installing any parts.

indicated by infinite ohm reading.

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T1 Sensor

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Contact for the return sensor T2 open,

Remove the plug from the flow sensor as a

WARNING:

Turn off power and water

supply

to the boiler before removing or installing any parts.

indicated by infinite ohm reading.

result of which error 32 occurs.

T2 Sensor

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WARNING: Turn off power and water supply to the boiler before removing or installing any parts. If checking gas pressures you MUST be qualified gas technician to service the gas system on this appliance.

Replace the control unit. Remove the E-Prom from the defective control unit and place onto the new control. The controller will automatically load the program into the new control unit.

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WARNING: Turn off power and water supply to the boiler before removing or installing any parts. If checking gas pressures you MUST be qualified gas technician to service the gas system on this appliance.

Replace the control unit. Remove the E-Prom from the defective control unit and place onto the new control. The controller will automatically load the program into the new control unit.

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WARNING: Turn off power and water supply to the boiler before removing or installing any parts. If checking gas pressures you MUST be qualified gas technician to service the gas system on this appliance.

Electrical short circuit, possible water damage to MCBA, main board

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WARNING: Turn off power and water supply to the boiler before removing or installing any parts. If checking gas pressures you MUST be qualified gas technician to service the gas system on this appliance.

No parameters present. Meaning the E-Prom has no program or is blank. Replace E-Prom or display (Model dependent).

If this error is displayed, there is no software on the MCBA or display/EPROM. A RINNAI conversion kit specific for the boiler model and fuel type must be installed. Follow the conversion kit instructions to load the software to the MCBA.

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Q-Series ribbon cable problem

or

defective key pad.

No software present.

WARNING: Turn off power and water supply to the boiler before removing or installing any parts. If checking gas pressures you MUST be qualified gas technician to service the gas system on this appliance.

Replace the control unit. Remove the E-Prom from the defective control unit and place onto the new control. The controller will automatically load the program into the new control unit.

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T5 sensor is reading too high of a flue gas temperature. (Adjust

reading.

parameter 84 – default 212 ⁰F) See location of T5 sensor below. If red cap is installed, T5 sensor is not being used.

Moisture on the flue gas sensor wires or terminals could cause a false temperature

T5 Senor, if installed

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E 115

Replace MCBA board

WARNING: Turn off power and water supply to the boiler before removing or installing any parts. If checking gas pressures you MUST be qualified gas technician to service the gas system on this appliance.

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WARNING: Turn off power to the boiler before removing or installing the fuse.

Check fuse mounted on PC board to see if it blown. In addition, check transformer output and wiring harness for transformer to ensure it is plugged in properly.

This is the low voltage fuse that is located directly next to the PCB board transformer. The OEM fuse has colored stripes; the spare fuse located on control cover is a clear glass. Please verify the amp rating (4 amp) on the metal rim of the fuse before installing it. It must be the same amperage as the fuse being replaced.

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Additional Troubleshooting Instructions

WARNING: Turn off power and water supply to the boiler before removing or installing any parts. If checking gas pressures you MUST be qualified gas technician to service the gas system on this appliance.

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WARNING: Turn off power and water supply to the boiler before removing or installing any parts. If checking gas pressures you MUST be qualified gas technician to service the gas system on this appliance.

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Checking the O

Setting

2

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Boiler Controls

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Pressing R or the reset button for more than 5 seconds will activate a 17 minute de

-

aeration

cycle.

Explanation of the function buttons

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Starting up: Filling and de

-

aerating the boiler and installation

Requirements of the water system

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Check the water pressure regularly and top off the installation when necessary. The

Note: You must have either a hot water or heat demand to activate de

-

aeration

Filling the heating system

working pressure of the installation should be between 16 and 18 PSI when the system is cold. Adjust your auto-feed to 16 – 18 PSI.

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Altering adjustments

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See additional

definitions below

PARA 36 E Combi. setting definitions 00 = activation by temperature drop for DHW (no plate warming) 10 = activation by temperature drop for DHW (plus plate warming) 20 = flow switch activation only DHW. (No plate warming/ no temp actuation)

In either setting above - 00 or 10 the Flow switch is still in the circuit and if it sticks "closed" it can keep the boiler locked in DHW and code 6 with appear on the screen. Unplug flow switch as it is not needed. (Do not waste time taking switch out and cleaning it, just unplug it electrically)

PARA 36 Q combi 01 = factory setting-load sharing "on" 00 = Alternate setting - Load sharing "off" (MCBA thinks a "grey" non-modulating valve is being used in place of the

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