DeDietrich MCA 45 - Page 46

Code Faults Cause
of the
error
Description Checking / solution
L03 DEF.OUTLET S.
PCU The boiler flow sensor is on an open
circuit
Bad connection
Sensor fault
4 Contact the professional who takes care of
maintenance of the appliance
L04 DEF.OUTLET S.
PCU Boiler temp too low Bad connection
Sensor fault
4 Contact the professional who takes care of
maintenance of the appliance
No water circulation
4 Vent the air in the heating system
4 Check the circulation (direction, pump,
valves)
4 Check the water pressure
L05 STB OUTLET
PCU Boiler temperature too high Bad connection
Sensor fault
4 Contact the professional who takes care of
maintenance of the appliance
No water circulation
4 Vent the air in the heating system
4 Check the circulation (direction, pump,
valves)
4 Check the water pressure
L06 BACK S.FAILURE
PCU The return temperature sensor has
short-circuited
Bad connection
Sensor fault
4 Contact the professional who takes care of
maintenance of the appliance
L07 BACK S.FAILURE
PCU The return temperature sensor is on
an open circuit
Bad connection
Sensor fault
4 Contact the professional who takes care of
maintenance of the appliance
L08 BACK S.FAILURE
PCU Return temperature too low Bad connection
Sensor fault
4 Contact the professional who takes care of
maintenance of the appliance
No water circulation
4 Vent the air in the heating system
4 Check the circulation (direction, pump,
valves)
4 Check the water pressure
L09 STB BACK
PCU Return temperature too high Bad connection
Sensor fault
4 Contact the professional who takes care of
maintenance of the appliance
No water circulation
4 Vent the air in the heating system
4 Check the circulation (direction, pump,
valves)
4 Check the water pressure
7. Troubleshooting MCA 45 - 65 - 90 - 115
45
06/09/2010 - 300024828-001-A