DeDietrich Innovens MCA 35 Installation And Service Manual page 117

MCA 35
Code Faults
D16 SWIM.P.B. S.FAIL
D16 SWIM.P.C. S.FAIL
D17 DHW 2 S.FAIL
D27 PCU COM. FAIL
D32 5 RESET:ON/OFF
D37 TA-S SHORT-CIR
D38 TA-S DISCONNEC
D99 DEF.BAD PCU
15/06/12 - 300022160-001-01
Cause Description
of the
fault
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.
SCU Sensor fault tank 2
SCU Communication failure between the SCU and PCU PCBs
Check the wiring between the SCU and PCU PCBs
4
Check that the PCU PCB is powered up (green LED on or flashing)
4
Change the PCU PCB
4
SCU 5 resets done in less than an hour
Switch the boiler off and switch back on
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 boiler,check that the TAS
simulation connector (delivered with package AD212) is fitted to the sensor card.
SCU 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 boiler,check that the TAS
simulation connector (delivered with package AD212) is fitted to the sensor card.
SCU The SCU software version does not recognise the PCU connected
Update the SCU with the appropriate software version
4
Checking / solution
Bad connection
Check whether the sensor is connected:
4
See chapter: "Deletion of sensors from the
memory in the PCB", page 116
Check the link and the connectors
4
Check that the sensor has been correctly fitted
4
Sensor fault
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
4
Bad connection
Check whether the sensor is connected:
4
See chapter: "Deletion of sensors from the
memory in the PCB", page 116
Check the link and the connectors
4
Check that the sensor has been correctly fitted
4
Sensor fault
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
4
8. Troubleshooting
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