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Should my Heil heat pump CH95 automatically defrost? And when?

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It depends if it has a defrost control built into it or not. Most units do not come with them installed they are an add on feature that you have to pay for. if the outside unit is icing up then the outside temperature is probably to low to run the compressor. I would switch over to aux. or emegency heat option on the thermostat as in low temperatures it is not efficent to run a heat pump anyway. Hope this helps have a wondeful evening.

Posted on Jan 30, 2010


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How would I know if my heil 9000 heat pump actually has indoor electric heat strips for the defrost mode?

Turn breaker off to outside unit and then turn heat on. Uf you have heat, you have electric heat strips

If you need further help, reach me via phone at

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We replaced fan motor on heil heat pump , now the defrost isn't kicking in, is this a wiring problem or unrelated to us replacing the fan motor?

Check low voltage at heatpump need 24voltsat R and C tterminal s if you have 24 volts on defrost board change board .if you dont have 24volts from r and c you have to go to indoor unit and look at low voltage wireing . Check wire nuts or when replace ing motor might have knock some loose check all low voltage. Hope this helps

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Heil heat pump heat won't work changed defrost board ac works

Reversing valve may be bad or stuck. U can pull the fan, then turn the unit on. The reversing valve is just a small unit with a 110 V. cable going to it. Sometimes taping the valve will make it change to heat.if so it will need to be replaced.

Feb 28, 2014 | Heating & Cooling

1 Answer

I have noticed my heat pump is freezing up on the outside unit, we have had freezing rain and snow the last 2 days but I have never noticed ice accumulation on the outside of the unit, it also seems like...

In freezing weather the heat pump efficiency drops. The freezing is normal. The equipment has a board and sensor to defrost your heat pump. Now this system can fail but freezing rain and snow get pulled into the unit get pulled into the unit coil and freeze blocking airflow. You can defrost the unit by turning it to cooling. This is what the defrost board does automatically.

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1 Answer

How long is the compressor in my heil max pro 10 waranty good for

Not sure which model number the Heil Max Pro 10 warranty uses. Heil will usally place the model number on the side of the outside unit or inside the cabinet for thee Inside unit. Click here for a direct link to=> Heil HVAC
Use care when reading any warranty because the wording is mostly written so you do not understand.
To help you decide which Heil product and warranty protection is best for you, select from the following at-a-glance comparisons.
Please let me know If I can help you with other question, Thank You, Sea Breeze

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2 Answers

It seems my heil heat pump is going into defrost every time it comes on and blowing a smell back into the vents in my home.The unit will come on heat up and then we smell this odor. It has not been very...

I would have either the circuit board that makes it go into defrost checked, our new Trane had same problem and we had to replace it, or also have them check the sensor that "tells" the unit to go into defrost. I'm suspecting that is happening in ours now, too, as it seems to go into defrost more often again, but not as bad as last year. As for the odor, you have what we, and a lot of others have, is called "dirty sock syndrome", appears to be cause by organisms of some sort growing on the coil in the indoor unit, when it goes into defrost mode the coil gets wet and "turns them on" thus making the organisms smell. Difficult to get rid of. Am going to try a spray called Alathene II and see if that helps.

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1 Answer

My outside heat unit is frozen and it is 10 degrees out, will it thaw while I have it on emergency heat? How long do I keep emergency heat on?

Switching to emergency heat will not defrost the unit.

If the Heat pump is malfunctioning, continue to use the emergency heat until the unit can be repaired properly.

At ten degrees, no heat pump can keep up., but it should be automatically bringing on the heat strips as back up heat. (same thing as emergency heat, it's just automatic.)

Either the extreme cold is overloading the defrost system, due to lack of properly operating exterior temp sensors or the defrost is malfunctioning,

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When to change from heat pump to alternate heat

We says the outside can pull heat out of 40* air, below this change to emergency heat or it should do this with the thermostat on its own.

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