DE DIETRICH AWHP MIT-IN iSystem User 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
FLOW FAIL.
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 MIT-IN iSystem
5. Troubleshooting
09/01/13 - 300027618-001-02
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