Room Air Conditioner
Troubleshooting Guide To save time and expense, check the following before calling an authorized service station.
| Occurrence | Possible Cause | Solutions |
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| Air conditioner will not operate | • Wall plug disconnected. | • Push plug firmly into wall outlet. |
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| • House fuse blown or circuit breaker tripped. | • Replace fuse with time delay type |
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| or reset circuit breaker. |
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| • Unit turned off and then on too quickly. | • If air conditioner is turned off, |
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| wait 3 minutes before restarting. |
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| • Thermostat set too low for cooling. | • Adjust thermostat to higher setting for cooling. |
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| Air from unit does not | • Thermostat set too warm. | • Set thermostat to colder temperature. |
| feel cold enough | • Room temperature below 70°F. | • Cooling may not occur until room |
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| temperature rises above 70°F. |
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| Air conditioner cooling, | • Outdoor temperature below 70°F. | • To defrost the coil set thermostat to warmer |
| but room is too warm — |
| position. |
| ice forming on cooling coil | • Dirty air filter — air restricted. | • Clean filter. See “Cleaning the Air Filter” section. |
| behind decorative front |
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| Air conditioner cooling, | • Dirty air filter — air restricted. | • Clean air filter. |
| but room too warm — |
| Refer to “Cleaning Air Filter” section. |
| NO ice forming on cooling coil | • Thermostat set too warm. | • Set thermostat to colder setting. |
| behind decorative front |
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| Noise when unit is cooling | • Air movement sound. | • The sound of rushing air is normal. If too loud, |
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| turn selector to lower fan setting. |
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| • Sound of fan hitting | • This is normal when humidity is high. |
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| removal system. | Close doors, windows and registers. |
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| • Window vibration — poor installation. | • Refer to installation instructions — |
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| check with installer. |
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| Water dripping inside | • Improper installation. | • Tilt air conditioner slightly to the outside to |
| when unit is cooling |
| allow water drainage. Refer to installation |
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| instructions — check with installer. |
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| Water dripping outside | • Unit removing large quantity of moisture | • This is normal during excessively humid days. |
| when unit is cooling | from humid room. |
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