User Manual

Code Faults Cause
of the
fault
Description Checking / solution
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
D29 IOBL.3WV B DEF
SCU Communication failure between the
SCU PCB and the V3V module
The V3V module is switched off
The V3V module and the SCU PCB are not
connected to the same live terminal
The V3V module has been removed
4 Contact the professional who takes care of
maintenance of the appliance
D30 IOBL.3WV C DEF
SCU Communication failure between the
SCU PCB and the V3V module
The V3V module is switched off
The V3V module and the SCU PCB are not
connected to the same live terminal
The V3V module has been removed
4 Contact the professional who takes care of
maintenance of the appliance
D31 COM.IOBL FAIL.
SCU The IOBL function is no longer
active
Problem on the SCU PCB
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 the boiler off and switch back on
4 If the boiler does not start after several resets (5 attempts possible), contact your
heating engineer and inform him of the error message displayed
D37
TA-S SHORT-CIR
SCU The Titan Active System® is short-circuited
4 Contact the professional who takes care of maintenance of the appliance
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 Contact the professional who takes care of maintenance of the appliance
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.
MCA 15 - MCA 25 MCA 25/28 MI 6. Troubleshooting
23/08/2011 - 300024159-001-B
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