Troubleshooting Guide
COMPLAINT | CAUSE | REMEDY |
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Compressor will not run, | Thermistor | Check the TEMP control. If not at the lowest number, |
but fan motor runs. |
| set TEMP control to this setting and restart the unit. |
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| Check the continuity of the thermistor. Replace the |
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| thermistor if the circuit is open. |
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| Capacitor (Discharge | Check the capacitor. |
| capacitor before servicing.) | Replace if not within ±10% of manufacturers rating. |
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| 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 mount- |
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| ed. Replace if open. (If the compressor temperature |
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| is high, remove the overload, cool it, and 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 |
| tion | the condenser; if restricted, clean carefully with a vac- |
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| uum cleaner (do not damage fins) or brush. Clean the |
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| interior base before reassembling. |
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| Condenser fins (damaged) | If condenser fins are closed over a large area on the |
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| coil surface, head pressures will increase, causing |
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| the compressor to overload. Straighten the fins or |
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| replace the coil. |
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Compressor cycles on | Capacitor | Test capacitor. |
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| |
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 to |
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| be cooled. |
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. |
| Copper tubing | Remove the cabinet carefully and rearrange tubing |
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| not to contact cabinet, compressor, shroud, and barri- |
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| er. |
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40Room Air Conditioner
