DE DIETRICH INNOVENS MCA 15 - MCA 25 - MCA 25_28 MI - Manual (Page 36)

Code Faults Cause
of the
fault Description Checking / solution
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
L10 DEP-RET<MIN PCU Difference between the flow and
return temperatures insufficient
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
L11 DEP-RET>MAX PCU Difference between the flow and
return temperatures too great
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
L12 STB OPEN PCU Maximum boiler temperature
exceeded (STB thermostat
maximum)
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
L14 BURNER FAILURE PCU 5 burner start-up failures No ignition
4
Contact the professional who takes care of
maintenance of the appliance
Presence of the ignition arc but no flame formation
4
Check that the gas valve is fully opened
4
Contact the professional who takes care of
maintenance of the appliance
Presence of the flame but insufficient ionization
(<3 µA)
4
Check that the gas valve is fully opened
4
Contact the professional who takes care of
maintenance of the appliance
6. Troubleshooting MCA 15 - MCA 25 MCA 25/28 MI
35 23/08/2011 - 300024159-001-B