COOLING ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS
Problem | Possible Cause | Action |
| Low voltage | Check voltage at compressor. 115V & 230V |
| units will operate at 10% voltage variance | |
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| Set | |
| erative | replace if inoperative |
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| Compressor hums but cuts off on | Hard start compressor. Direct test compressor. |
Compressor | B10 overload | If compressor starts, add starting components |
Open or shorted compressor wind- |
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does not run | Check for continuity & resistance | |
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| Open overload | Test overload protector & replace if inoperative |
| Open capacitor | Test capacitor & replace if inoperative |
| Inoperative system switch | Test for continuity in all positions. Replace if |
| inoperative | |
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| Broken, loose or incorrect wiring | Refer to appropriate wiring diagrams to check |
| wiring | |
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Problem | Possible Cause | Action |
| Inoperative system switch | Test switch & replace if inoperative |
| Broken, loose or incorrect wiring | Refer to applicable wiring diagram |
Fan motor | Open capacitor | Test capacitor & replace if inoperative |
does not run | Fan speed switch open | Test switch & replace if inoperative |
| Inoperative fan motor | Test fan motor & replace if inoperative (be sure |
| internal overload has had time to reset) | |
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Problem | Possible Cause | Action |
| Undersized unit | Refer to industry standard sizing chart |
| Set to coldest position. Test | |
| necessary | |
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| Dirty filter | Clean as recommended in Owner's Manual |
| Dirty or restricted condenser or | Use pressure wash or biodegradable cleaning |
Does not cool or | evaporator coil | agent to clean |
only cools slightly | Poor air circulation | Adjust discharge louvers. Use high fan speed |
| Fresh air or exhaust air door open | Close doors. Instruct customer on use of this |
| on applicable models | feature |
| Low capacity - undercharge | Check for leak & make repair |
| Compressor not pumping properly | Check amperage draw against nameplate. If |
| not conclusive, make pressure test | |
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