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MCBA FOR SPECIALISTS:
INSTALLER, SERVICE ENGINEER
SAFETY STOP (ERROR MODE)
If a fault occurs while the appliance is running, the system locks and
the screen starts to flash.The first character is an E and the next two
characters give the code for this fault, as illustratedin the table below.
Table of error codes and how to resolve them
To unlock the system:
• Press RESET on the screen.
• Contact your installer if the fault happens again.
Codes Description of the fault Resolution of the fault
Abnormal flame signal
- Check the wiring
(short-circuit in the 24V wiring)
- Check the electrode/ replace the MCBA
(water damage).
No flame signal after five attempts at firing the boiler
- Check the ignition cable, the electrode and the
position of the electrode.
- Check that there is gas at the burner.
Persistent lock - Press RESET
EPROM error
-If the problem persists after two RESET attempts,
replace the MCBA.
Max input, thermostat open or 24V fuse gone.
- Check the wiring and check the
24V fuse on the MCBA.
Internal error
- If the problem persists after two RESET attempts,
replace the MCBA.
T1 > 110°C
- Check the NTC wiring and replace if necessary.
T2 > 110°C - Check the NTC wiring and replace if necessary.
T1 gradient too high
- Check that the pump is turning. If there is
no problem with the pump, drain the system.
No fan signal present
- If the fan is working:
• Check the fan control connection and the fan wiring
• if the problem persists after 2 RESET attempts, replace the
fan
• if the problem persists, replace the MCBA.
- If the fan is not working:
• Check that the fan 230V connection. If the problem persists,
replace the fan.
NTC 1 short-circuit
- Check the connection and the NTC1 wiring
If the problem persists, replace the NTC1.
NTC 2 short-circuit
- Check the connection and the NTC2 wiring
If the problem persists, replace the NTC2.
NTC 3 short-circuit
- Check the connection and the NTC3 wiring
If the problem persists, replace the NTC3.
NTC 1 connection open
- Check the connection and the NTC1 wiring
If the problem persists, replace the NTC1.
NTC 2 connection open
- Check the connection and the NTC2 wiring
If the problem persists, replace the NTC2.
NTC 3 connection open
- Check the connection and the NTC3 wiring
If the problem persists, replace the NTC3.
Internal error
- If the problem persists after two RESET attempts,
replace the MCBA.
Error while reading the parameters Press RESET. If the error persists, replace the MCBA.
Problem with the power supply to the fan
Check the MCBA power supply voltage. If it is OK, replace
the fan.
To