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I have carrier heat pump nothing is running indoor or outdoor unit

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  • unru11ey1 Apr 10, 2011

    does the fan come on when it is set on fan only?

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Check that you have power to indoor unit 120volts if yes check fuse on control board of indoor unit check control board for 24 volt the indoor unit controls the outdoor unit

Posted on Apr 13, 2011

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1 Answer

Is the heat pump cooling itself down? It is a combination heat pump/air conditioner wall unit.


If a unit is in heating mode the outdoor unit is in cooling mode (outside always does opposite of indoor) after a while if there is a build up of ice on outdoor coil unit stops and puts hot gas through outdoor coil to clear it. The indoor fan stops to avoid and heat loss in area served buy unit once this has been done and indoor unit coil is hot again fan will start. This is the correct operation of the unit to save against bust could and reduced efficiency

Dec 31, 2015 | Heating & Cooling

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My heat pump froze and now has an E-6 error on screen and does not run


Lost communication between indoor and outdoor, did you shut both indoor and outdoor off?

Feb 11, 2015 | Heating & Cooling

1 Answer

What is the split pump


A split system has the parts split up between indoors and outdoors. A heat pump heats and cools your living space with the same unit. A split heat pump has the system split between indoors and outdoors and heats or cools your living space. a SPLIT PUMP sounds like something that has broken.

Feb 01, 2015 | Heating & Cooling

1 Answer

Heat pump wont come on


Make sure you have power to the outdoor unit. The outdoor unit on a minisplit powers the indoor unit.

Dec 13, 2013 | Carrier Heating & Cooling

1 Answer

Ice on coils of heat pump not cooling


Which coil?, indoor or out? Indoor coils freeze due to clogged filters, low freon, blower motor not working. Outdoor coil freezing could mean, in rare cases in cooling mode, reversing valve not shifting.

Oct 02, 2013 | Carrier 52CQ-312-4 Comfort Series Heat...

2 Answers

I have a Mitsubishi heat pump that runs well but the outdoor unit does not defrost what could be the problem.


Why does my heat pump ice up in Winter?
Heat pumps naturally ice-up in the winter. It is normal for the entire coil to be covered in a white frost and even light ice, during cold weather conditions. However, it is bad for the entire unit to be encased in ice. This indicates ductless heat pump problems which should be addressed quickly to save energy and avoid serious damage to your ductless unit. These systems should periodically go into a defrost cycle. This keeps the unit running efficiently. If the coils are blocked by ice, proper heat transfer between the coil and the outside air will not occur.
How does the defrost mode work?
When the mini split heat pump goes into defrost, the reversing valve inside of the outdoor unit is energized, switching the system from heat to the air conditioning mode. The outdoor coil becomes the hot, the indoor coil becomes cold, and both - the outdoor and indoor fans shut off. This allows the outdoor coil to melt accumulated ice. When the built-in micro-computer analyzes that all ice have been melted, the heat pump heating system goes back to heating mode.
sanyo-mini-split-defrost.pngA cloud of water vapor may be seen rising over the outdoor unit and a "whoosh" sound can be heard as the refrigerant reverses direction. The entire process usually takes up to 10 minutes (depending on conditions).
How often does the system goes into defrost mode?
Ductless mini-split heat pumps have different ways of determining when to go into defrost. The built-in microcomputer determines outdoor temperature, refrigerant pressures, and several other factors. In colder temperatures the system will go into defrost more often than in warmer.
If a ductless mini split heat pump is severely iced-up in the winter it is possible that it isn't defrosting (though there could be many other causes). Let the manufacturer certified technician check your system

Oct 29, 2011 | Mitsubishi Mr. Slim MXZ30TN Air...

1 Answer

Outdoor not workin


the outdoor unit is totally dead or only to the heat mode?if it is to the heat mode propably must check the refrigirator.if it is too the cool mode the plate has problem.if is multi check the outdoor plate in other occasion check the indoor plate.

Mar 28, 2009 | Fujitsu Heating & Cooling

1 Answer

Carrier Model No 42NVQ007MM inv, NO Heat output


unit should be locked out on low temp and your electric heat should be running. is your installer a service tech or just an installer that could also be the problem if he is a service tech it would work correct when he left

Jan 31, 2009 | Carrier Heating & Cooling

1 Answer

Match up Carrier equipment


carrier did sell some systems with R407c as a quick fix to gov regulations for about 2 yrs. R407c is a blend . and is treated like R410a except R407c pressures are more simular to R22. being that the pressures run the same the system should work with out changing any parts that being said if the evaporator has been used for R22 the oil residue wiil give you problems ifit is a new unit you would be ok.

Jan 08, 2009 | Carrier 38CKC042 Air Conditioner

1 Answer

Heat pump not running


Depending on the age of the unit it could be several things, does it have a circuit board? Contactor could be bad, freon leak if it has a low pressure switch, burnt wires, connections, etc. Do a complete visual and check for 24 volts, does the indoor unit run? Transformer may be bad.... No indoor unit - no outdoor unit, most of the time the outdoor unit gets its 24 vac power from the indoor unit which runs them both, look for fuses (like car fuses)..

Apr 26, 2008 | Heating & Cooling

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