DeDietrich Innovens MCA 25 BIC User Manual page 38

6. Troubleshooting
Code Faults
BURNER FAILURE PCU
L14
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
L39 BL OPEN FAIL
37
Cause Description
of the
fault
5 burner start-up failures
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
PCU The BL inlet opened for a short time Bad connection
Checking / solution
No ignition
Contact the professional who takes care of
4
maintenance of the appliance
Ignition arc, but no flame formation
Check that the gas valve is fully opened
4
Contact the professional who takes care of
4
maintenance of the appliance
Presence of the flame but insufficient ionization
(<3 µA)
Check that the gas valve is fully opened
4
Contact the professional who takes care of
4
maintenance of the appliance
Ionization current present when there should not
be a flame
Ignition transformer defective
Gas valve defective
The burner remains very hot: CO
Contact the professional who takes care of
4
maintenance of the appliance
Bad connection
SU PCB faulty
Contact the professional who takes care of
4
maintenance of the appliance
Bad connection
Fan defective
Contact the professional who takes care of
4
maintenance of the appliance
Bad connection
Sensor fault
Contact the professional who takes care of
4
maintenance of the appliance
Water circulation direction reversed
Check the circulation (direction, pump,
4
valves)
No ionization current
Check that the gas valve is fully opened
4
Contact the professional who takes care of
4
maintenance of the appliance
Bad connection
Contact the professional who takes care of
4
maintenance of the appliance
Bad connection
SCU PCB not connected or faulty
Contact the professional who takes care of
4
maintenance of the appliance
External cause
Parameter incorrectly set
Contact the professional who takes care of
4
maintenance of the appliance
15/06/12 - 300022162-001-01
MCA 25/28 BIC
too high
2