MCA
Pro
45/65/90/115
MCA-Pro ISM Rv.4.1 2/2017
98
8. Troubleshooting
Error
code
Description
Probable causes
Checking / solution
é
:
14
5 burner start-up
failures
No ignition
• Check cabling of ignition transformer
• Check the ionization/ignition electrode
• Check breakdown to earth
• Check the condition of the burner set
• Check the grounding
• Defective control SU PCB
• Presence of the ignition arc but
no flame formation
• Purge the gas supply to remove air
• Check that the gas valve is fully opened
• Check the supply pressure
• Check the operation and setting of the gas valve unit
• Check that the air inlet and flue gas discharge flues
are not blocked
• Check the wiring on the gas valve unit
• Defective control SU PCB
• Presence of the flame but
insufficient ionization (<3 μA)
• Check that the gas valve is fully opened
• Check the supply pressure
• Check the ionization/ignition electrode
• Check the grounding
• Check the wiring on the ionization/ignition electrode
é
:
16
False flame signal
• Ionization current present when
there should not be a flame
• Ignition transformer defective
• Gas valve defective
• The burner remains very hot:
CO2 too high
• Check the ionization/ignition electrode
• Check the gas valve and replace if necessary
• Set the CO2
é
:
17
Problem on the gas
valve SU PCB
• Bad connection
• Defective SU PCB
• Check the wiring
• Inspect the SU PCB and replace it if need be
é
:
34
Fan fault
• Bad connection
• Fan defective
• Check the wiring
• Replace the fan if need be
• Check for adequate draw on the chimney connection
é
:
35
Supply and return
reversed
• Bad connection
• Sensor fault
• Sensor not or badly connected
• Water circulation direction
reversed
• Replace the sensor if necessary
• Check the circulation (direction, pump, valves)
• Check that the sensors are operating correctly
• Check that the sensor has been correctly fitted
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