If your Mitsubishi AC is not heating but it's set at the COOL or DRY mode, use the AC's faraway control to pick out the HEAT or AUTO mode via pressing the MODE button till the preferred mode is displayed. The Mode operation adjustments from AUTO → COOL → DRY → HEAT in that series: The higher the HSPF rating, the more efficient a heat pump is at heating, which results in less energy used and more energy savings overall. ENERGY STAR heat pumps must have at least an 8.5 HSPF, but heat pumps can range up to 14 HSPF. So, going up to 13.5, Mitsubishi HSPFs rank on the high end.

A full drain pan can cause a musty smell. If a house smells musty, but there’s no mold, you may want to check if you have a full drain pan. A pan filled with water can indicate a clogged

stop the air conditioner and disconnect the power plug or turn the breaker OFF. • A continued operation in the abnormal state may cause a malfunc-tion, fi re, or electric shock. In this case, consult your dealer. When the air conditioner does not cool or heat, there is a pos-sibility of refrigerant leakage. In this case, consult your dealer.

To check if your unit's heat mode is working or not all you have to do is to turn it on in cold weather conditions, and wait for about 30-60 minutes. Then check the room temperature to know if it has warmed up. If there is no change in the temperature (from cold to warm), then there is a high possibility that your AC unit has an issue.

My air conditioner is turned on but it doesn’t seem to be cooling (heating) the room properly. If your air conditioner doesn’t seem to be heating or cooling the room properly, check the filters to see if they need cleaning and check the drain pipe for any obstructions. 0vSys.
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    • mitsubishi air conditioner heat mode not working