ACV 50 Installation, Operating And Servicing Instructions page 30

MCBA PARAMETERS FOR THE SPECIALIST
Codes Description of the fault
NTC3 short-circuit
NTC1 connection open
NTC2 connection open
NTC3 connection open
Internal error
Flue gas temperature too high (NTC5)
Error while reading the parameters
Problem with the power supply to the fan
664Y3000.A
Resolution of the fault
- Check the connection of the NTC3 sensor
- Check the wiring of the NTC3 sensor
If the problem persists, replace the NTC3 sensor
- Check the connection of the NTC1 sensor
- Check the wiring of the NTC1 sensor
If the problem persists, replace the NTC1 sensor
- Check the connection of the NTC2 sensor
- Check the wiring of the NTC2 sensor
If the problem persists, replace the NTC2 sensor
- Check the connection of the NTC3 sensor
- Check the wiring of the NTC3 sensor
If the problem persists, replace the NTC3 sensor
If the problem persists after two RESET attempts,
replace the MCBA.
- Check the connection of the NTC5 sensor
- Check the wiring of the NTC5 sensor
If the problem persists, replace the NTC5 sensor
Press RESET
If the error persists, replace the MCBA.
- Check the MCBA power supply voltage.
If it is OK, replace the fan.
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