
Code Faults
Cause
of the
fault
Description
Checking / solution
L08
BACK S.FAILURE
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
L09
STB BACK
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
L10
DEP-RET<MIN
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
AGC 10/15 - AGC 15 - AGC 25 - AGC 35
8. Troubleshooting
20/01/2012 - 300026081-001-B
109
Содержание AGC 10/15
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