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 | |
| inoperative | |
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| Compressor hums but cuts off on B10 overload | Hard start compressor. Direct test compressor. If |
| compressor starts, add starting components | |
Compressor |
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does not run | Open or shorted compressor windings | 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 inop- |
| erative | |
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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 |
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Fan speed switch open | Test switch & replace if inoperative | ||
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| 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 | ||
| sary | ||
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| Dirty filter | Clean as recommended in Owner's Manual | |
| Dirty or restricted condenser or evaporator coil | Use pressure wash or biodegradable cleaning agent | |
Does not cool or | to clean | ||
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only cools slightly | Poor air circulation | Adjust discharge louvers. Use high fan speed | |
| Fresh air or exhaust air door open on applicable | Close doors. Instruct customer on use of this feature | |
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| 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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