Code
Cause of
the fault
Description
Checking / solution
e11
PCU
Difference between the flow and
return temperatures too great
Bad connection
Sensor fault
4
Contact the professional who takes care of maintenance of the
appliance
No water circulation
4
Vent the air in the heating system
4
Check the circulation (direction, pump, valves)
4
Check the water pressure
e12
PCU
Maximum boiler temperature
exceeded (STB thermostat
maximum)
Bad connection
Sensor fault
4
Contact the professional who takes care of maintenance of the
appliance
No water circulation
4
Vent the air in the heating system
4
Check the circulation (direction, pump, valves)
4
Check the water pressure
e14
PCU
5 burner start-up failures
No ignition
4
Contact the professional who takes care of maintenance of the
appliance
Ignition arc, but no flame formation
4
Check that the gas valve is fully opened
4
Contact the professional who takes care of maintenance of the
appliance
Presence of the flame but insufficient ionization (<3 µA)
4
Check that the gas valve is fully opened
4
Contact the professional who takes care of maintenance of the
appliance
e16
PCU
Detection of a parasite flame
Ionization current present even though there is no flame
Ignition transformer defective
Gas valve defect
The burner remains very hot: CO
2
too high
4
Contact the professional who takes care of maintenance of the
appliance
e17
PCU
Internal error on the SU board
Bad connection
SU PCB faulty
4
Contact the professional who takes care of maintenance of the
appliance
e34
PCU
The fan is not running at the right
speed
Bad connection
Fan defective
4
Contact the professional who takes care of maintenance of the
appliance
e35
PCU
Flow and return reversed
Bad connection
Sensor fault
4
Contact the professional who takes care of maintenance of the
appliance
Water circulation direction reversed
4
Check the circulation (direction, pump, valves)
e36
PCU
The flame went out more than 5
times in 24 hours while the burner
was operating
No ionization current
4
Check that the gas valve is fully opened
4
Contact the professional who takes care of maintenance of the
appliance
7. Troubleshooting
EGC 25
29
09/02/2016 - 300026082-001-05
