Owner's manual

Code Faults Cause
of the
fault
Description Checking / solution
D15 ST.TANK S.FAIL
SCU Storage tank sensor fault
Note:
The hot water storage tank reheating
operation is no longer assured.
Bad connection
Sensor fault
4 Contact the professional who takes care of
maintenance of the appliance
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
Sensor fault
4 Contact the professional who takes care of
maintenance of the appliance
D17 DHW 2 S.FAIL
SCU Sensor fault tank 2 Bad connection
Sensor fault
4 Contact the professional who takes care of
maintenance of the appliance
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
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.
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 MCA 15 - MCA 25 MCA 25/28 MI
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15/06/12 - 300022161-001-01