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
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.
D99 DEF.BAD PCU
SCU The SCU software version does not recognise the PCU connected
4 Contact the professional who takes care of maintenance of the appliance
6. Troubleshooting AFC 18 - AFC 24 - AFC 30
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09/01/2014 - 300026440-001-03