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HEAT/COOL ONLY ROOM AIR CONDITIONERS: TROUBLESHOOTING TIPS
Problem | Possible Cause | Possible Solution | |
Room temperature | Bad indoor ambient thermistor | Check error codes. Replace if needed. | |
uneven |
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Opened doors, windows, etc. | Close doors, windows, etc. | ||
(Heating cycle) | |||
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Problem | Possible Cause | Possible Solution | |
| Incorrect wiring | Refer to appropriate wiring diagram | |
Unit will not | Bad outdoor coil thermistor or | Check error codes. Replace needed part. | |
electronic control board | |||
defrost |
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| Outdoor temperature below | Ambient temperature will have to | |
| rise above 32 degrees F for frost | ||
| 32 degrees | ||
| to melt | ||
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Problem | Possible Cause | Possible Solution | |
| Dirty filter | Clean as recommended in Owner’s Manual | |
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| Check heat rise across coil. If unit operates | |
| Unit undersized | efficiently, check if insulation can be added | |
| to attic or walls. If insulation is adequate, | ||
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| recommend additional unit or larger one | |
Does not heat | Outdoor | ||
of control. If temperature is below 38°F, | |||
models) | |||
adequately | replace control | ||
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| Heater | Check for adequate fan air across heater. | |
| Check control for open at 160°F & close at | ||
| off | ||
| 150°F | ||
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| Shorted supplementary heater | Ohmmeter check, approx. | |
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| Incorrect wiring | Check applicable wiring diagram | |
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