DeDietrich AWHP-2 MIT-IN-2 iSystem User Manual page 37

AWHP-2 MIT-IN-2 iSystem
Code Faults
D19 SOL.COL.S.FAIL
D20 SOL COM.FAIL
D27 PCU COM. FAIL
D32 5 RESET:ON/OFF
D37 TA-S SHORT-CIR
TA-S DISCONNEC SCU
D38
D99 DEF.BAD PCU
L33 FAIL.FLOW
10/06/2015 - 7616372-001-05
Cause Description
of the
fault
SCU Header sensor fault
SCU Interruption in communication between the SCU PCB and the solar control system
Contact the professional who takes care of maintenance of the appliance
4
SCU Communication failure between the SCU and PCU PCBs
Contact the professional who takes care of maintenance of the appliance
4
SCU 5 resets done in less than an hour
Switch off heat pump and start up again
4
SCU The Titan Active System® is short-circuited
Check that the connection cable between the SCU PCB and the anode is not short-
4
circuited
Check that the anode is not short-circuited
4
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.
The Titan Active System® is on an open circuit
Check that the connection cable between the SCU PCB and the anode is not severed
4
Check that the anode is not broken
4
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.
SCU The SCU software version does not recognise the PCU connected
Contact the professional who takes care of maintenance of the appliance
4
The flow rate is lower than the threshold defined by the MIN.STOP.FLOW. parameter
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4
6. Troubleshooting
Checking / solution
Bad connection
Sensor fault
Contact the professional who takes
4
care of maintenance of the appliance
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