DE DIETRICH AWHP-2 MIT-IN-2 iSystem - Manual (Page 29)

Code Faults Cause
of the
fault Description Checking / solution
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 off heat pump and start up again
D37 TA-S SHORT-CIR SCU The Titan Active System® is short-circuited
4
Check that the connection cable between the SCU PCB and the anode is not short-
circuited
4
Check that the anode is not short-circuited
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 heat pump, check that the
TAS simulation connector (delivered in package AD212) is fitted to the sensor board.
D38 TA-S DISCONNEC SCU The Titan Active System® is on an open circuit
4 Check that the connection cable between the SCU PCB and the anode is not severed
4
Check that the anode is not broken
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 heat pump, check that the
TAS simulation connector (delivered in package AD212) is fitted to the sensor board.
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
L33 FAIL.FLOW The flow rate is lower than the threshold defined by the MIN.STOP.FLOW. parameter
4 Contact the professional who takes care of maintenance of the appliance
AWHP-2 MIT-IN-2 iSystem 5. Troubleshooting
31/03/2014 - 7616372-001-02 28