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Troubleshooting can present hazards of electricity, rotating parts, sharp edges and weight. Troubleshooting must be done by trained,
experienced technicians only. Improper troubleshooting can result in equipment damage, severe personal injury or death.
Trouble
1.
Indoor and outdoor fans will not operate in cool
mode.
2.
Indoor fan operates on cool but compressor
does not start.
3.
Indoor fan runs on cool and compressor starts
but stops after a short interval.
4.
Indoor and outdoor fans run on cool and com-
pressor starts and runs, but compressor occa-
sionally stops (on overload device).
5.
Compressor starts and runs on cool but
indoor or outdoor fan does not run.
6.
Equipment gives electrical shock.
7.
Dip switch function does not work.
8.
Insufficient cooling capacity.
(Continues on page 20)
Troubleshooting Chart
!
WARNING
Possible Causes
a.
No power to unit.
b.
Faulty control pad or control box PC boards.
c.
Loose connections to control pad or control box
PC board.
a.
Temperature setting too high.
b.
Low voltage.
c.
Faulty control pad or control box PC boards.
d.
Loose wire connections to control pad or control
box PC board.
e.
Defective compressor overload.
f.
Loose connections at compressor terminals.
g.
Wiring to compressor terminals defective.
h.
Loose connections in compressor overload
device.
i.
Starting capacitor malfunctions.
j.
Defective compressor.
k.
Built in time delay
a.
Compressor overload is activated due to over-
loading.
a.
Low voltage due to overload circuits within build-
ing or throughout the local power system. Due
to varying power demands, this condition might
exist only at certain times during the day or on
very hot days.
b.
High voltage due to fluctuations in local power
system; usually occurs during low load periods
of the day.
c.
Partial short circuit in compressor motor. Under
normal loading a compressor with a partial short
circuit might appear to be operating all right;
increased condensing air temperature might
then cause a short.
a.
Faulty control pad or control box PC boards.
b.
Open circuited blower motor.
c.
Blower rubbing against its housing.
d.
Bearings on blower motor seized.
e.
Loose wiring connection.
a.
Grounded electrical circuit.
a.
Function has not been activated by momentary
loss of power.
b.
Dip switch did not connect
c.
Built-in time delays
a.
Equipment standing too long without being run.
b.
Insufficient airflow through condenser due to:
1) Dirty condenser.
2) Obstructed outdoor louver.
3) Condenser fan not running.
4) Condenser fan not up to speed.
5) Condenser fan slipping on motor shaft.
6) Recirculation of condenser air.
Treatment
a.
Check supply line fusses, circuit breakers, and
be sure the power is on. Blown fuses would
indicate circuit overloading, a short circuit or
a grounded condition in the circuit. Voltage
supply to the equipment should be checked.
Voltage under load must be within 5% of
voltage given on date plate.
b.
Replace.
c
Tighten.
a.
Lower the setting.
b.
Must be within 5% of data plate rating.
c.
Replace.
d.
Tighten.
e.
Replace.
f.
Tighten.
g.
Replace.
h.
Tighten.
i.
Replace.
j.
Replace.
k.
Wait up to 4 minutes
a.
Check voltage supply. Clean outdoor coil inside
and out. Check for recirculation of condenser
air. Put air "splitters" in, if missing. Check com-
pressor for short circuit. If defective, replace.
a.
Run separate electric line to equipment. Con-
sult local power company.
b.
Consult local power company.
c.
Replace compressor.
a.
Replace.
b.
Replace.
c.
Adjust blower motor or blower wheel position.
d.
Replace blower motor.
e.
Tighten.
a.
Repair and check equipment ground.
a.
Unplug the power cord then plug it back in.
b.
Slide it back and forth to make sure it has
mechanically switched.
c.
There are time delays built-in to the control to
prevent overlap of functions. Wait up to 4
minutes.
a.
If the air conditioner is allowed to stand for an
extended length of time without being run on
cool, it is possible for all the refrigerant to be-
come absorbed in the oil inside the compressor
and refrigeration circuit. If this should happen
there will be no cooling until the necessary work-
ing pressures have been established. This will
take about 5 minutes of continuous running.
b.
1) Clean.
2) Remove obstructions.
3) Check same as in the case of malfunctioning
condenser air blower.
4) Check for correct voltage. Replace motor
if necessary.
5) Adjust fan position and tighten setscrews.
6) Make corrections.
IM 812 / Page 21 of 24
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