60
Troubleshooting
Should a major problem develop, refer to the following information for possible cause and corrective steps
：
Neither fan nor compressor runs (No power supply)
1. The fuse may be blown or the circuit Breaker is open. Check electrical circuits and motor windings for shorts or
grounds. Investigate for possible overloading. Replace fuse or reset circuit Breakers after fault is corrected.
2. Wires may be loose or broken. Tighten or replace.
3. Supply voltage may be too low. Check it with the power company.
4. Control system may be faulty. Check thermostat for correct wiring and check 24 volt transformer for burnout.
Fan runs but compressor does not run
1. Check compressor capacitor.
2. Wires may be loose or broken. Tighten or replace.
3. The high pressure switch may have tripped due to:
a) Fouled or plugged condenser;
b) Lack of or no condenser water;
c) Too warm condenser water;
d) Not enough airflow over the coil due to dirty filters;
5. Check thermostat setting, calibration and wiring.
6. The compressor overload protection is open. If the compressor dome is extremely hot, the overload will not reset
until cooled down. If the overload is external, replace it. If the overload is internal, replace the compressor.
7. The compressor winding may be open. Check continuity with ohmmeter. If the winding is open, replace the
compressor.
Compressor attempts to start but is not successful
1. Check continuity for contactor.
2. High pressure trip check.
3. High superheat results in high discharge temperature.
4. Lack of refrigerant.
Compressor stops after short run
1. Check thermostat setting.
2. Check system pressure.
3. Refer to troubleshooting-3 possible causes.
Insufficient cooling or heating
1. Check thermostat setting.
2. Airflow may be insufficient. Check and clean the filter.
3. The reversing valve may defects, creating a bypass of refrigerant. If the unit will heat, check the reversing valve
coil.
4. Check capillary tubes for possible chock of refrigerant flow.
5. Check if any block in water flow or if the water is dirty.
6. Lack of refrigerant.
Summary of Contents for AWH028C
Page 33: ...43 1 20 MODEL AWH028 030C Wiring Diagrams...
Page 34: ...44 MODEL AWH028 030CR 20...
Page 35: ...45 MODEL AWH040C 1 20...
Page 36: ...46 MODEL AWH040CR 20...
Page 37: ...47 MODEL AWH050 060 065 070C 20...
Page 38: ...48 MODEL AWH050 060 065 070CR 20...
Page 39: ...49 MODEL AWH080 100 125 150C 20...
Page 40: ...50 MODEL AWH080 100 125 150CR 20...
Page 41: ...51 MODEL AWH180 200 250 300C 02...
Page 42: ...52 MODEL AWH180 200 250 300CR 02...
Page 43: ...53 MODEL AWH350C COOLING ONLY AUXILIARY HEATER COOLING ONLY...
