Troubleshooting Guide
COMPLAINT | CAUSE | REMEDY | ||
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Compressor will not run, | Thermostat | Check the position of knob If not at the coldest set- | ||
but fan motor runs. |
| ting, advance the knob to this setting and restart | ||
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| unit. | |
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| Check continuity of the thermostat. Replace ther- | |
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| mostat if circuit is open. | |
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| Thermistor | Check the TEMP control. If not at the lowest num- | |
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| ber, set TEMP control to this setting and restart | |
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| the unit. Check the continuity of the thermistor. | |
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| Replace the thermistor if the circuit is open. | |
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| Capacitor (Discharge | Check the capacitor. | |
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| capacitor before servicing.) | Replace if not within ±10% of manufacturers rat- | |
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| ing. Replace if shorted, open, or damaged. | |
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| Compressor | Check the compressor for open circuit or ground. If | |
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| open or grounded, replace the compressor. | |
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| Overload | Check the compressor overload, if externally | |
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| mounted. Replace if open. (If the compressor tem- | |
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| perature is high, remove the overload, cool it, and | |
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| retest.) | |
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Compressor cycles on | Voltage | Check the voltage. | ||
overload. |
| If not within limits, call an electrician. | ||
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| Overload | Check overload, if externally mounted. | |
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| Replace if open. (If the compressor temperature is | |
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| high, remove the overload, cool, and retest.) | |
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Compressor cycles on | Fan motor | If not running, determine the cause. Replace if | ||
overload. |
| required. | ||
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| Condenser air flow restric- | Remove the cabinet. inspect the interior surface of | |
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| tion | the condenser; if restricted, clean carefully with a | |
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| vacuum cleaner (do not damage fins) or brush. | |
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| Clean the interior base before reassembling. | |
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| Condenser fins (damaged) | If condenser fins are closed over a large area on | |
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| the coil surface, head pressures will increase, | |
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| causing the compressor to overload. Straighten | |
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| the fins or replace the coil. | |
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Compressor cycles on | Capacitor | Test capacitor. | ||
overload. | Wiring | Check the terminals. If loose, repair or replace. | ||
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| Refrigerating system | Check the system for a restriction. | |
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Insufficient cooling or heat- | Air filter | If restricted, clean of replace. | ||
ing |
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Exhaust damper door | Close if open. | |||
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| Unit undersized | Determine if the unit is properly sized for the area | |
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| to be cooled. | |
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Excessive noise | Turbo or fan | Check the set screw or clamp. If loose or missing, | ||
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| correct. If the turbo or fan is hitting air guide, | |
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| rearrange the air handling parts. | |
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| Copper tubing | Remove the cabinet carefully and rearrange tubing | |
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| not to contact cabinet, compressor, shroud, and | |
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| barrier. | |
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33Room Air Conditioner