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Troubleshooting
QUICK
CHECKS
COMPRESSOR
With cover and board accessed, power off.
Discharge capacitor and check resistance across 2 terminals of capacitor.
This will measure START and RUN windings of compressor. No need to remove wires.
Check on 200 ohms scale or such. Should read 3 to 10 ohms.
Checking from either wire on terminal of capacitor to the BLACK wire on RY101 will check the overload and COMMON.
Be sure to check each to ground, an open circuit should be seen at each terminal.
If no shorts or grounds appear on compressor windings, remove BLACK wire on RY101 and GREY wire
on RY102, safely jump the BLACK and GREY wire. Re-apply power and ONLY the compressor should run.
FAN MOTORS
On most units the fan plugs are identical.
If a fan doesn't run and the plugs are the same, temporarily swap plugs on the power board.
REMEMBER, the outdoor fan only runs with the compressor.
Resistance values are similar. Compare the 2 motors.
If motor won't start but runs with help suspect bad capacitor.
NOTE: Some units will have a DC motor, do not swap plugs.
DC motors will not be able to be resistance checked.
THERMISTORS
These may be checked at control board. Connector CN1- just above thermostat. See chart on mini-manual
for values. Unless the value is way out of range thermistor is o.k. Remember the thermistors' resistance is calculated
into temperatures in the control board to determine operating conditions.
HEATERS
2800 Series
The heater and protectors can be checked after the control board and panel on the power
board have been removed. Locate the 3 pin connector with RED, WHITE and BLACK wires.
Disconnect and check from each lead of the plug that goes into coil area to BLACK(fabric)
wire on RY103.
Otherwise, resistance should be:
WHITE to BLACK approx. 20 ohms
RED to BLACK approx. 30 ohms
BLACK to BLACK 60 ohms
If ALL measure OPEN then suspect an open FUSE or PROTECTOR.
3800 Series
Resistance readings will be similar in the 3800 just the points to measure are different.
BLACK to BROWN on RY109 approx. 60 ohms
RED to
WHITE to
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