Troubleshooting; Flow Chart - Heat Controller BG-81G Service Manual

Service Manual

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

Display keeps showing "AS" or "HS".
Check the wiring.
No
Check the resistance of room temperature sensor,
according to the characteristic table.
No
Replace the main control board.
Display keeps showing "LO" or "HI".
Check whether the room ambient temperature is over 31C (90F) or lower than 16C (60F).
No
Check the resistance of room temperature sensor,
according to the characteristic table.
No
Replace the control board.
Room Air Conditioner with R-410A
Yes
Correct or repair the wires.
17
Yes
Replace the room temperature sensor.
Yes
Replace the room temperature sensor.
Heat Controller, Inc.