Faults
Code Cause
of the
error
Description
Checking / solution
BACK S.FAILURE
L07
PCU
The return temperature sensor
is on an open circuit
Bad connection
4
Check the wiring between the PCU PCB and the
sensor
4
Check that the SU PCB is correctly in place
4
Check that the sensor has been correctly fitted
Sensor fault
4
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
BACK S.FAILURE
L08
PCU
Return temperature too low
Bad connection
4
Check the wiring between the PCU PCB and the
sensor
4
Check that the SU PCB is correctly in place
4
Check that the sensor has been correctly fitted
Sensor fault
4
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
No water circulation
4
Vent the air in the heating system
4
Check the circulation (direction, pump, valves)
4
Check the water pressure
4
Check the cleanliness of the heat exchanger
STB BACK
L09
PCU
Return temperature too high
Bad connection
4
Check the wiring between the PCU PCB and the
sensor
4
Check that the SU PCB is correctly in place
4
Check that the sensor has been correctly fitted
Sensor fault
4
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
No water circulation
4
Vent the air in the heating system
4
Check the circulation (direction, pump, valves)
4
Check the water pressure
4
Check the cleanliness of the heat exchanger
DEP-RET<MIN
L10
PCU
Difference between the flow
and return temperatures
insufficient
Sensor fault
4
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
Bad connection
4
Check that the sensor has been correctly fitted
No water circulation
4
Vent the air in the heating system
4
Check the circulation (direction, pump, valves)
4
Check the water pressure
4
Check the cleanliness of the heat exchanger
4
Check that the heating pump is operating correctly
MCA 15 - MCA 25 MCA 25/28 MI
8. Troubleshooting
29/04/2010 - 300022146-001-B
117
Содержание Innovens MCA 15
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