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T e c h n i c a l T r a i n i n g
Fault diagnosis help:
Description
Fault
code Cause
Solution
Main circuit board fault
F61
Gas valve control fault
• Check all connections to the main circuit
board
• Check the electronic board.
• Check the product code.
• Reset the appliance.
F62
Gas valve closure fault
F63
Main circuit board memory fault
F64
Rapid fluctuation of Heating flow or return
sensors.
F65
Main circuit board temperature too high
F67
Flame signal fault on the main circuit board
Fluctuation of flame signal
(FL)
F68
See fault F28
See fault F28
User interface incompatible
with main circuit board
F70
Bad product code
• Check the product code.
• Check the card reference number.
Permanent temperature
difference between heater
flow and return sensors.
(NTC2,NTC5)
F72
Discrepancy between Heating flow and
return temperatures (permanent difference)
• Check the temperature sensor connections
• Replace defective sensors.
Heating circuit pressure
sensor fault (Cp)
F73
Pressure sensor short-circuited or
disconnected
• Check the sensor connections.
• Check the sensor
F74
Pressure sensor electrical fault
External accessory faults
(not available when this
document was printed)
F77
External gas valve
Condensate pump
• Check the accessory connections
No water in the installation:
no temperature increase with
burner lit. (NTC2,NTC5)
F83
Circuit not properly bled
See fault F22
Permanent temperature
difference between heater
flow and return sensors
(NTC2,NTC5)
F84
Flow and return temperature
sensors inverted or disconnected.
Temperature sensors faulty.
• Check the temperature sensor connections
• Replace defective sensors.
Heater flow and return
sensors fault
(NTC2,NTC5)
F85
Flow and return temperature
sensors connected to the same pipe
• Check the temperature sensor connections
User interface fault
(no display)
-
Interface card defective
or bad connections.
• Check the main circuit board connection.
• Replace the interface card
If no fault is displayed on the screen but :
- The boiler does not start in heating mode
=> consult list of status codes in “Technical specification” chapter
(this list indicates whether the panel receives a TA heating request, or whether the boiler is in a timer period, for example)
=> check the temperature readings of the different sensors
=> check the outdoorl sensor curve
- The boiler does not start in hot water mode
=> consult list of status codes in “Technical specification” chapter
=> check the temperature readings of the different sensors