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8. Troubleshooting
Code Faults
L16
PARASIT FLAME
L17
VALVE FAIL
L34
FAN FAILURE
L35
BACK>BOIL FAIL
L36
I-CURRENT FAIL
L37
SU COM.FAIL
L38
PCU COM.FAIL
112
Cause
Description
of the
fault
PCU
Detection of a parasite flame
PCU
Problem on the SU PCB
PCU
The fan is not running at the
right speed
PCU
Flow and return reversed
PCU
The flame went out more than
5 times in 24 hours while the
burner was operating
PCU
Communication failure with the
SU PCB
PCU
Communication failure
between the PCU and SCU
PCBs
Checking / solution
Ionization current present when there should not be a
flame
Ignition transformer defective
Check the ionization/ignition electrode
4
Gas valve defective
Check the gas valve and replace if necessary
4
The burner remains very hot: CO
Set the CO
4
2
Bad connection
Check that the SU PCB is correctly in place
4
SU PCB faulty
Inspect the SU PCB and replace it if need be
4
Bad connection
Check the wiring between the PCU PCB and the
4
fan
Fan defective
Check for adequate draw on the chimney
4
connection
Replace the fan if need be
4
Bad connection
Check that the sensor has been correctly fitted
4
Sensor fault
Check the Ohmic value of the sensors
4
Replace the sensor if necessary
4
Water circulation direction reversed
Check the circulation (direction, pump, valves)
4
No ionization current
Purge the gas supply to remove air
4
Check that the gas valve is fully opened
4
Checking the gas supply pressure
4
Check the operation and setting of the gas valve
4
unit
Check that the air inlet and flue gas discharge flues
4
are not blocked
Check that there is no recirculation of flue gases
4
Bad connection
Check whether the SU PCB has been correctly
4
fitted into the connector on the PCU PCB
Change the SU PCB
4
Bad connection
Check the wiring between the PCU and SCU PCBs
4
Run an AUTODETECTION in the menu
4
#CONFIGURATION
SCU PCB not connected or faulty
Replace the SCU PCB
4
MCA 35
too high
2
15/06/12 - 300022160-001-01
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