COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS
Problem | Possible Cause | Possible Solution | |
| Overload inoperative. Opens too | Check operation of unit. Replace overload if | |
| soon | system operation is satisfactory | |
| Compressor restarted before | Control board’s default of 3 minutes | |
| system pressures equalized | delay inoperative. Replace board. | |
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Compressor runs |
| Check voltage with unit operating. Check for | |
Low or fluctuating voltage | other appliances on circuit. Air conditioner | ||
for short periods | should be in a dedicated circuit with proper | ||
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only. Cycles on |
| voltage & fused separately | |
overload |
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Incorrect wiring | Refer to appropriate wiring diagram | ||
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| Shorted or incorrect capacitor | Test capacitor and replace as needed. | |
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| Restricted or low air flow through | Check for proper fan speed or blocked | |
| condenser coil or evaporator coil | coils. Correct as needed. | |
| Compressor running abnormally | Check for kinked discharge line or restricted | |
| condenser. Refrigerant overcharge. | ||
| hot | ||
| Check amperage, connections. | ||
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Problem | Possible Cause | Possible Solution | |
| No power | Check power supply, LCD I plug, wire | |
Unit does not | connection. | ||
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turn on | Incorrect wiring | Refer to appropriate wiring diagram | |
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| Defective thermistor | Replace thermistor or electronic control board | |
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Problem | Possible Cause | Possible Solution | |
| Poorly installed | Refer to Installation Manual for proper | |
| installation | ||
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| Fan blade striking chassis | Reposition - adjust motor mount | |
Noisy operation |
| Check that compressor grommets have not | |
Compressor vibrating | deteriorated. Check that compressor mounting | ||
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| parts are not missing | |
| Improperly mounted or loose | Check assembly & parts for looseness, | |
| cabinet parts | rubbing & rattling | |
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Problem | Possible Cause | Possible Solution | |
| Evaporator drain pan overflowing | Clean obstructed drain trough | |
| Condensation forming underneath | Evaporator drain pan broken or cracked. | |
| Reseal or replace. No chassis gasket installed. | ||
| base pan | ||
| Install chassis gasket | ||
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| Poor installation resulting in rain | Check installation instructions. Reseal as | |
Water leaks into | entering the room | required | |
| Dirty evaporator coil. Use pressure wash | ||
the room | Condensation on discharge grille | ||
or biodegradable cleaning agent to clean. | |||
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| louvers | Environmental phenomena: point supply | |
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| louvers upward. Put fan on high. | |
| Chassis gasket not installed | Install gasket, per Installation manual | |
| Downward slope of unit is too | Refer to installation manual for proper | |
| steep inward | installation |
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