Heat Controller BG-81G Service Manual page 30

Service Manual
PROBLEM P
No cooling or
heating.
Compressor will not
run while fan motor
runs.
Excessive noise.
The unit starts and
stops frequently.
Room Air Conditioner with R-410A
OSSIBLE CAUSE
No power
Wiring
Temperature setting
Main switch setting
Reversing valve wire
Reversing valve
Voltage
Wiring
Main switch failure
Capacitor (Discharge
capacitor before testing)
Thermostat
Compressor
Copper tubing
Power supply
Outdoor temperature
29
REMARK
Check the voltage. Call an electrician if not
within correct limits of +/- 10% of nominal
voltage rating required.
Check terminals. Repair and correct if loose.
Check and adjust the thermostat.
Check and adjust the main switch setting.
Check the resistance of reversing valve wire.
Replace the wire if short, open or damaged.
If the reversing valve is blocked, the heating
mode will not operate. Replace the reversing
valve after checking the reason for failure.
Check voltage. Call Supply Authority if not
within limits of +/- 10% of nominal voltage
rating required.
Check the wire connections, if loose, repair
or replace the terminal. If wires are off,
refer to wiring diagram for identification,
and replace. Check wire locations. If not
per wiring diagram, correct.
Check and replace the main switch if failed.
Check the capacitor.
Replace if not within +/-10% of
manufacturer's rating. Replace if shorted,
open, or damaged.
Check the thermostat setting if not at the
coolest (in cooling mode) or the warmest (in
heating mode). Try adjusting these settings.
Check the compressor for open circuit or
ground. If open or grounded, replace the
compressor.
If copper tubing is rubbing against the cabinet
and vibrating while operating, remove the
cabinet and carefully rearrange tubing to not
contact cabinet, compressor, shroud and barrier.
The input power supply voltage is too low or
not within +/- 10% of nominal voltage rating
required. Call an electrician if not within limits.
When the outdoor temperature is too high,
the compressor will go into a protection
mode or 3 minute time delay.
Heat Controller, Inc.