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664Y3300
mCBA pARAmETERS FoR THE SpECIALIST
Codes
Description of the fault
Remedying the fault
Abnormal flame signal detected
- Check the wiring (short circuit in the 24V wiring)
- Check the electrode
- Replace the MCBA (water damage)
No flame presence signal after five start-up attempts
- Check the ignition wiring
- Check the electrode and its positioning
-
Check the gas supply to the burner
Gas valve or triac error
Replace the rectifier or the gas valve.
Persistant lockout
Press “RESET”
Internal error
If the problem persists after two “RESET” attempts,
replace the MCBA
EPROM error
If the problem persists after two “RESET” attempts,
replace the MCBA
Max input thermostat open or 24 V fuse has blown.
- Check the wiring
- Check the 24 Volt fuse of the MCBA
- Check link in 12-13.
Internal error
If the problem persists after two “RESET” attempts,
replace the MCBA
T1 > 110°C
- Check the NTC wiring and replace it if necessary
- If the NTC 1 sensor is OK, check if there is water flow
in the boiler
T2 > 110°C
- Check the NTC wiring and replace it if necessary
T1 gradient too high
- Check if the pump is running
- If there is no problem with the pump, bleed the system
No tachometer signal from the fan
- Check the PWM connection
- Check the fan’s wiring
If the problem persists after two “RESET” attempts,
replace the fan, otherwise, change the MCBA
The fan’s tachometer signal does not drop back
below “0”
- Check the draft in the chimney.
If the draft is sufficient, replace the fan
Short circuit NTC 1
- Check the connection of the NTC 1 sensor
- Check the wiring of the NTC 1 sensor
If the problem persists, replace the NTC 1 sensor
Short circuit NTC 2
- Check the connection of the NTC 2 sensor
- Check the wiring of the NTC 2 sensor
If the problem persists, replace the NTC 2 sensor
To unlock the system:
• Press “RESET” on the screen.
• If the fault reoccurs, contact your installer.
lIst of error codes + solutIons
[in error mode]
If a fault occurs during operation, the system locks down and
the screen starts flashing.
The first character is an “
E
” and the following two indicate the
code of this fault, as indicated in the table below.
Summary of Contents for 120
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