Open Or Short Circuit Of Temperature Sensor; Full-Water Malfunction (For Ceiling Cassette) - Heat Controller A-VMH18DC-1 Service Manual

Service Manual

9.3.1.6 Open or short circuit of temperature sensor.

Check the connections
between temperature
sensor and PCB. Are
the connections good?
Check the resistance value
of the sensor via Appendix
1, is it normal?
Replace the sensor and
Replace the sensor
c h e c k i f t h e p r o b l e m
happen again?

9.3.1.7 Full-water malfunction (For Ceiling Cassette)

Check PCB board or replace the indoor main PCB
Yes
Yes
No
Is If the water-level switch
is inserted well?
Yes
Is
If the water-level switch
is broken?
No
Is
If the water pump is
normal?
Yes
VMH SerieS
No Correct the connections.
Correct the connections per
wiring diagram.
Replace indoor or outdoor PCB.
No Insert the water-level switch well
Re-insert the water-level switch well
Yes Replace the water-level switch
No
Replace the water pump
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