ACV MCBA Manual

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
Codes
Abnormal flame signal
No flame signal after five attempts at firing the boiler
Persistent lock
EPROM error
Max input, thermostat open or 24V fuse gone.
Internal error
To
T1 > 110°C
T2 > 110°C
T1 gradient too high
No fan signal present
NTC 1 short-circuit
NTC 2 short-circuit
NTC 3 short-circuit
NTC 1 connection open
NTC 2 connection open
NTC 3 connection open
Internal error
Error while reading the parameters
Problem with the power supply to the fan
16
Description of the fault
To unlock the system:
• Press RESET on the screen.
• Contact your installer if the fault happens again.
Resolution of the fault
- Check the wiring
(short-circuit in the 24V wiring)
- Check the electrode/ replace the MCBA
- Check the ignition cable, the electrode and the
position of the electrode.
- Check that there is gas at the burner.
- Press RESET
-If the problem persists after two RESET attempts,
replace the MCBA.
- Check the wiring and check the
24V fuse on the MCBA.
- If the problem persists after two RESET attempts,
replace the MCBA.
- Check the NTC wiring and replace if necessary.
- Check the NTC wiring and replace if necessary.
- Check that the pump is turning. If there is
no problem with the pump, drain the system.
- 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.
- Check the connection and the NTC1 wiring
If the problem persists, replace the NTC1.
- Check the connection and the NTC2 wiring
If the problem persists, replace the NTC2.
- Check the connection and the NTC3 wiring
If the problem persists, replace the NTC3.
- Check the connection and the NTC1 wiring
If the problem persists, replace the NTC1.
- Check the connection and the NTC2 wiring
If the problem persists, replace the NTC2.
- Check the connection and the NTC3 wiring
If the problem persists, replace the NTC3.
- If the problem persists after two RESET attempts,
replace the MCBA.
Press RESET. If the error persists, replace the MCBA.
Check the MCBA power supply voltage. If it is OK, replace
the fan.
(water damage).