Honeywell HVAC232 Series Applications Manual page 37

Fault code Fault name
25 Microcontroller watchdog
fault
27 Back EMF protection
29 Thermistor fault
34 Internal bus
communication
35 Application fault
41 IGBT
Overtemperature
50 Analogue input select
20% - 100%
( selected signal range
4 to 20 mA or 2 to 10 V)
51 External fault
52 Door Panel fault
53 Fieldbus fault
54 Slot fault
Application manual HVAC232/402 | Document 27-652 | Issue ENG06 | 2019-08-07
Possible cause
Faulty operation component failure
Drive has detected that the magnetized motor is
running in start situation.
• A rotating PM-motor
The thermistor input of option board has detected
increase of the motor temperature.
Ambient interference or defective hardware.
Application is not working properly.
Overtemperature alarm is issued when the IGBT
switch temperature exceeds 230 °F (110 °C)
Current at the analogue input is < 4mA;
Voltage at the analogue input is < 2 V.
• Control cable is broken or loose.
• Signal source has failed.
Digital input fault. Digital input has been programmed
as external fault input and this input is active.
Control place is keypad, but door panel has been
disconnected.
The data connection between the fieldbus Master and
the fieldbus of the drive has broken.
The connection between optional board and API has
been broken.
Correcting actions
Reset the fault and restart.
If the fault re-occur, contact the distributor near to
you.
Make sure that there is no rotating PM-motor when
the start command is given.
Check motor cooling and loading. Check thermistor
connection (If thermistor input of the option board is
not in use it has to be short circuited).
If the fault re-occur, contact the distributor near to
you.
Contact the distributor near to you.
Check loading.
Check motor size.
Make identification run.
Check the current loop circuitry.
Remove the external device fault.
Check the connection between optional board and
API. If connection is correct, contact the nearest
Honeywell distributor.
Check installation.
If installation is correct, contact the nearest
Honeywell distributor.
Check board and slot.
Contact the nearest Honeywell distributor.
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