Heat Controller 8. TROUBLESHOOTING

Display keeps showing "AS" or "HS".
Check the wiring. Correct or repair the wires.
Check the resistance of room temperature sensor,
according to the characteristic table.
Replace the main control board.
Replace the room temperature sensor.
Display keeps showing "LO" or "HI".
Replace the room temperature sensor.
Check whether the room ambient temperature is over 31C (90F) or lower than 16C (60F).
Replace the control board.
Check the resistance of room temperature sensor,
according to the characteristic table.
8. TROUBLESHOOTING
In general, problems are classified by three types. One is called Starting Failure which is
caused from an electrical defect, another is ineffective Air Conditioning caused by a defect in
the refrigeration circuit and improper application, and the other is called Structure Damage.
8.1 Flow Chart
Yes
No
Yes
No
No
Yes
No
Service Manual
Room Air Conditioner with R-410A
Heat Controller, Inc.
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