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MCA 15 - MCA 25 MCA 25/28 MI
Code Faults
D27
PCU COM. FAIL
D29
IOBL.3WV B DEF
D30
IOBL.3WV C DEF
D31
COM.IOBL FAIL.
D32
5 RESET:ON/OFF
D37
TA-S SHORT-CIR
D38
TA-S DISCONNEC
23/08/2011 - 300024159-001-B
Cause
Description
of the
fault
SCU
Communication failure between the SCU and PCU PCBs
Contact the professional who takes care of maintenance of the appliance
4
SCU
Communication failure between the
SCU PCB and the V3V module
SCU
Communication failure between the
SCU PCB and the V3V module
SCU
The IOBL function is no longer
active
SCU
5 resets done in less than an hour
Switch the boiler off and switch back on
4
If the boiler does not start after several resets (5 attempts possible), contact your
4
heating engineer and inform him of the error message displayed
SCU
The Titan Active System® is short-circuited
Contact the professional who takes care of maintenance of the appliance
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
Contact the professional who takes care of maintenance of the appliance
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.
Checking / solution
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
Contact the professional who takes care of
4
maintenance of the appliance
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
Contact the professional who takes care of
4
maintenance of the appliance
Problem on the SCU PCB
Contact the professional who takes care of
4
maintenance of the appliance
6. Troubleshooting
38
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