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DE DIETRICH INNOVENS MCA 35 User Manual

Page 39

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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 35

6. Troubleshooting

24/08/2011 - 300024162-001-B

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