Heat Controller RG-51G Service Manual page 19

Heat Controller, Inc.
PROBLEM
No cooling
Compressor will not run while
fan motor runs.
Excessive noise.
The unit starts and stops frequently.
Room Air Conditioner with R-410A
POSSIBLE CAUSE
No power
Wiring
Temperature setting
Main switch setting
Voltage
Wiring
Main switch failure
Capacitor (Discharge capacitor before
testing)
Thermostat
Compressor
Copper tubing
Power supply
Outdoor temperature
18
RG-51G Service Manual
REMARK
Check the voltage. Call an electrician
if no within the limit.
Check the terminals. Repair and
correct if loose.
Check and adjust the thermostat.
Check and adjust the main switch
setting.
Check voltage. Call an electrician if
not within limits.
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
failure.
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). Set it if
not.
Check the compressor for open
circuit or ground. If open or grounded,
replace the compressor.
Remove the cabinet and carefully
rearrange tubing not to contact
cabinet, compressor, shroud and
barrier.
The input power supply voltage is too
low. Call an electrician if not within
limits.
When the outdoor temperature is too
high, the compressor will not operate
due to built in safety features.