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Defrost & power lights are blinking, Unit does not heat.

Manual says extreme cold temps may cause problems. 20s last night, 40s today. Tried emergency on/of, nothing. Turned unit on cool & fan came on. Outside unit hasn't come on at all.

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  • 1,198 Answers

Heat pumps are only good above certain temps, like mentioned. Then usually heater coils come on if the unit has them. It may not. Check the manual, or Google the make and model for a user manual. Make sure all your breakers are on all the way, not tripped. A tripped one will be a little away from on, turn it all the way off and then on again.

Posted on Nov 24, 2013

Testimonial: "I have the manual, read all troubleshooting in it. This unit is a heat pump, not just AC. It was heating a few days ago, just stopped today after having 20s last night. It's not the breaker. Thanks anyway."

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Therinnaiguy
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SOURCE: no cooling after power out, indicator lights pattern not in manual

The Mitsubishi units have to be reset by turning off the indoor units by switching the remote or thermostat to off. Then turn off the breaker to the outside unit(s). After 30 seconds,turn on the breaker and then you can turn on the remote for cool. If no lights come on on the inside units, most likely you have blown a fuse soldered on the main PC board. At this point, call your technician. A goos tech will be able to wire in an in-line fuse holder so if it should happen again, you can easily replace the fuse. If you do see a light or two come on at the indoor unit but the outdoor unit does not start after 3 or 4 minutes, sounds like you will need to call a technician. Most likely you have a blown fuse on the main PC board of the outside unit. It is not an easy one to replace. Good Luck!

Posted on Sep 04, 2007

haystack11
  • 55 Answers

SOURCE: Rheem heat pump,have to keep pushing red reset button for fan

Either the fan motor is going out OR the compressor may need a boost of power from a quick start.

When the compressor gets old, sometimes it requires a little extra power to get it going.

Your unit should be under work warranty if they installed it.

Posted on Jan 06, 2010

  • 3 Answers

SOURCE: Electrolux Kelvinator - Unit on defrost

Check the defrosting sensor on the coil or the solanoid on the reversing valve.

Posted on Jun 07, 2010

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