DeDietrich Innovens MCA 25/28 BIC, Installation And Service Manual

Page: 107 / 124

Code Faults Cause
of the
fault Description Checking / solution
D16
D16 SWIM.P.B. S.FAIL
SWIM.P.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
4
Check whether the sensor is connected:
¼
See chapter: "Deletion of sensors from the
memory in the PCB", page 106
4
Check the link and the connectors
4
Check that the sensor has been correctly fitted
Sensor fault
4
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
D17 DHW 2 S.FAIL
SCU Sensor fault tank 2 Bad connection
4
Check whether the sensor is connected:
¼
See chapter: "Deletion of sensors from the
memory in the PCB", page 106
4
Check the link and the connectors
4
Check that the sensor has been correctly fitted
Sensor fault
4
Check the Ohmic value of the sensor
4
Replace the sensor if necessary
D27 PCU COM. FAIL
SCU Communication failure between the SCU and PCU PCBs
4
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
D32 5 RESET:ON/OFF
SCU 5 resets done in less than an hour
4
Switch the boiler off and switch back on
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 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
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 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
Update the SCU with the appropriate software version
MCA 25/28 BIC 8. Troubleshooting
15/06/12 - 300022159-001-01 105