York MHC-MHH, Installation Manual

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14
HIGH WALL
Remedy
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
Capacitor.
8. Check and retighten.
9. Find the cause before reset.
1. Check the wiring and the
compressor winding resistance.
2. Find the cause then replace
Capacitor.
1. Remove charge, repair, evacuate
and recharge.
2. Insulate them separately.
3. Wait while unit has enough time to
cool the room.
1. Check Thermostat setting.
2. Check condenser air circulation.
3. Find leak, repair and recharge.
4. Remove charge, evacuate and
recharge.
1. Remove charge, evacuate and
recharge.
2. Determine the cause and replace
compressor.
3. Remove charge, evacuate and
recharge.
4. Replace it.
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.
Problem
A. The air conditioner does not run.
B. The outdoor fan runs but the
compressor will not start.
C. There is insufficient heating or
cooling.
D. The compressor run
continuously.
E. The compressor starts but shuts
down quickly.
F. Clicking sound is heard from
the air conditioner.
TROUBLE SHOOTING GUIDE
Probable cause
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. Motor winding cut or grounded.
2. Faulty Capacitor.
1. There is a gas leak.
2. Liquid and gas line insulated
together.
3. The room was probably very hot
(cool) when you started the
system.
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
refrigerant circuit.
1. Too much or too little refrigerant.
2. Faulty compressor.
3. Air or incondensables in
refrigerant circuit.
4. Changeover valve damaged or
blocked open (heat pump unit)
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.
03_MHC/BOH 07-25.p65 18/3/02, 16:32 14