York YUHC 18-60 - Manual (Page 22)

22
ENGLISH
TROUBLE SHOOTING GUIDE
Problem Probable cause Remedy
A. The air conditioner does not
run.
1. Power failure.
2. Fuse blown or circuit breaker
open.
3. Voltage is too low.
4. Faulty contactor or relay.
5. Electrical connections loose.
6. Thermostat adjustment too low
(in heating mode) or too high (in
cooling mode).
7. Faulty capacitor.
8. Incorrect wiring, terminal loose.
9. Pressure switch tripped.
1. Wait for power resume.
2. Replace the fuse or reset the
breaker.
3. Find the cause and fix it.
4. Replace the faulty component.
5. Retighten the connection.
6. Check thermostat setting.
7. Find the cause then replace ca-
pacitor.
8. Check and retighten.
9. Find the cause before reset.
B. The outdoor fan runs but the
compressor will not start.
1. Motor winding cut or grounded.
2. Faulty capacitor.
1. Check the wiring and the com-
pressor winding resistance.
2. Find the cause then replace ca-
pacitor.
C. There is insufficient heating
or cooling.
1. There is a gas leak.
2. Liquid and gas line insulated to-
gether.
3. The room was probably very hot
(cool) when you started the sys-
tem.
1. Remove charge, repair, evacu-
ate and recharge.
2. Insulate them separately.
3. Wait while unit has enough time
to cool the room.
D. The compressor runs con-
tinuously.
1. Thermostat adjustment too low
(in heating mode) or too high (in
cooling mode).
2. Faulty fan.
3. Refrigerant charge too low, leak.
4. Air or incondensables in refriger-
ant circuit.
1. Check thermostat setting.
2. Check condenser air circulation.
3. Find leak, repair and recharge.
4. Remove charge, evacuate and
recharge.
E. The compressor starts but
shuts down quickly.
1. Too much or too little refrigerant.
2. Faulty compressor.
3. Air or incondensables in refriger-
ant circuit.
4. Changeover valve damaged or
blocked open (heat pump unit).
1. Remove charge, evacuate and
recharge.
2. Determine the cause and replace
compressor.
3. Remove charge, evacuate and
recharge.
4. Replace it.
F. Clicking sound is heard from
the air conditioner.
In heating or cooling operation any
plastic parts may expand or shrink
due to a sudden temperature change
in this event, a clicking sound may
occur.
In heating or cooling operation any
plastic parts may expand or shrink
due to a sudden temperature change
in this event, a clicking sound may
occur.
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