DeDietrich Innovens MCA 35 Installation And Service Manual page 111

MCA 35
Code Faults
L04 DEF.OUTLET S.
L05 STB OUTLET
L06 BACK S.FAILURE
L07 BACK S.FAILURE
15/06/12 - 300022160-001-01
Cause Description
of the
fault
PCU Boiler temp too low
PCU Boiler temperature too high
PCU The return temperature sensor
has short-circuited
PCU The return temperature sensor
is on an open circuit
Checking / solution
Bad connection
Check the wiring between the PCU PCB and the
4
sensor
Check that the SU PCB is correctly in place
4
Check that the sensor has been correctly fitted
4
Sensor fault
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
4
No water circulation
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
Bad connection
Check the wiring between the PCU PCB and the
4
sensor
Check that the SU PCB is correctly in place
4
Check that the sensor has been correctly fitted
4
Sensor fault
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
4
No water circulation
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
Bad connection
Check the wiring between the PCU PCB and the
4
sensor
Check that the SU PCB is correctly in place
4
Check that the sensor has been correctly fitted
4
Sensor fault
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
4
Bad connection
Check the wiring between the PCU PCB and the
4
sensor
Check that the SU PCB is correctly in place
4
Check that the sensor has been correctly fitted
4
Sensor fault
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
4
8. Troubleshooting
109