DE DIETRICH MODULENS AGC 15, AGC 25, AGC 35 - Manual (Page 36)

Code Faults Cause
of the
fault Description Checking / solution
D15 ST.TANK S.FAIL SCU Storage tank sensor fault
Note:
The hot water storage tank reheating
operation is no longer assured.
Bad connection
Sensor fault
4 Contact the professional who takes care of
maintenance of the appliance
D16
D16 SWIM.B S.FAIL
SWIM.C S.FAIL SCU Swimming pool sensor fault circuit B
Swimming pool sensor fault circuit C
Note:
Swimming pool reheating is always
done during the circuit’s comfort
period.
Bad connection
Sensor fault
4
Contact the professional who takes care of
maintenance of the appliance
D17 DHW 2 S.FAIL SCU Sensor fault tank 2 Bad connection
Sensor fault
4
Contact the professional who takes care of
maintenance of the appliance
D18 ST.TANK S.FAIL SCU Solar tank sensor fault Bad connection
Sensor fault
4
Contact the professional who takes care of
maintenance of the appliance
D19 SOL.COL.S.FAIL SCU Header sensor fault Bad connection
Sensor fault
4 Contact the professional who takes care of
maintenance of the appliance
D20 SOL COM.FAIL SCU Interruption in communication between the SCU PCB and the solar control system
4 Contact the professional who takes care of maintenance of the appliance
D27 PCU COM. FAIL SCU Communication failure between the SCU and PCU PCBs
4
Contact the professional who takes care of maintenance of the appliance
D32 5 RESET:ON/OFF SCU 5 resets done in less than an hour
4
Switch the boiler off and switch back on
4 If the boiler does not start after several resets (5 attempts possible), contact your
heating engineer and inform him of the error message displayed
D37 TA-S SHORT-CIR SCU The Titan Active System® is short-circuited
4 Contact the professional who takes care of maintenance of the appliance
Remarks:
Domestic hot water production has stopped but can nonetheless be restarted using key
r
.
The tank is no longer protected.
If a tank without Titan Active System® is connected to the boiler,check that the TAS
simulation connector (delivered with package AD212) is fitted to the sensor card.
D38 TA-S DISCONNEC SCU The Titan Active System® is on an open circuit
4
Contact the professional who takes care of maintenance of the appliance
Remarks:
Domestic hot water production has stopped but can nonetheless be restarted using key
r
.
The tank is no longer protected.
If a tank without Titan Active System® is connected to the boiler,check that the TAS
simulation connector (delivered with package AD212) is fitted to the sensor card.
D99 DEF.BAD PCU SCU The SCU software version does not recognise the PCU connected
4
Contact the professional who takes care of maintenance of the appliance
6. Troubleshooting AGC 10/15 AGC 15 AGC 25 AGC 35
35 03/12/2013 - 300026080-001-03