Feel free to discuss your heat pump defrost problem here. Or help us solve some of the problems presented.Click below to see contributions from other visitors to this page... Heat Pump Defrosts at 45 degrees and too often. I recently installed a Airtemp VT48D-36k 3.0 ton Heat pump. The outside unit defrosts at 45 dgrees and higher and does it way to often approximately … Trane heat pump shuts down at 0 degrees fahrenheit The new Trane heat pump cuts off completely at 0 degrees. The installer was told that this 15 seer model is designed to shut down because it can no longer … blows cold air too long Trans outside unit 8 years old 5 ton. When it defrosts it blows cold air for about 30 minutes House temperature drops about 5 degrees everytime it defrosts. Insulated pipe in basement drips. There is a slight drip from the insulated pipe that runs across my basement ceiling which connects the outside heat pump equipment to the inside equipment. High temperature frequent defrosting My new Goodman heat pump defrosts even at outside temperatures of 42-46 degrees.

Very Cold Vent Air (56 degrees) during Defrost Even though Heat Strips are On I have a new Trane XL-15 3.5 ton heat pump. It works fine except during defrost. When conditions are: 65 degrees inside; cold air Really cold air forcefully coming up through registers when defrost cycle is on..temperature drops 2 full degrees in house ...system says" auxillary heat … york model ef4h does not go into defrost  I have a york model e4fh heat pump in the house i just purchased durning the summer the ac stopped company came and looked at it and said a wire had came … won't go into defrost Goodman SSZ140361AF We have changed the defrost sensor and board but still won't go into to defrost How to determine if a defrost board is functional The carrier heat pump will not initiate defrost. Make: carrier heat pump no defrost cycle ice on coil Defrost cycle not working ice on coils while heat pump is running Heater Fan Relay Problem I have an Amana SPOH6001A unit that when it is cold, the heater fan relay clicks real loud and the outdoor fan momentarily cuts out.

If the temperature … Heat Pump not Defrosting in Defrost Mode I have a older unit(Heil). The unit seems to go into defrost mode but it doesn't seem to be defrosting anything. The fan shuts off and the compressor … Defrost control board turns out side fan off during cool Model Carrier 25HBC536A300 S/N 2211E06528 While the heat pump is in cool cycle (running well) the indoor fan turns off and the compressor keeps running … Mitsubishi Heat Pump Defrost is On Too Often In winter conditions the defrost cycle operates 35 minutes apart...while the coils outside were clean and no ice or frost... the model of my mitsubishi … whirlpool model WHP4430AAE When the outside temperature drops to less than -6 degrees C, the heat pump cycles more then 7 times and the furnace cycles on and off several times. will not defrost new defrost board, refrigerant is fine, ice build up and will not defrost its a Carrier heat pump Model #38QN030330 Defrost Icing Problems - American Standard Heat Pump This unit is an American Standard heat pump, 2.5 ton 13 seer, R-22.

It ices up every time it is 42 degrees or colder and raining outside. will not defrost  Not rated yetYork model YHJD30S41S2A will not defrost when outside temps. get near 32 degrees in side air continues to cycle from blowing warm air to cold air and … Defrost Cycle Too Short Not rated yetLast winter my York heat pump was not going into defrost mode. hvac induction unitI was able to force defrost by jumping the pins on the control board. ductless mini split air conditioner consumer reportsDefrosting took quite …liebert ac units tech support Unit won't heat or cool--they want to replace defrost panel Not rated yetLennox. Intermittant problem with the air conditioning not working correctly. It blows cold air for awhile, eventually it just blows coolish air, the …

defrosting cool mode Not rated yetRheem RQNC 048 going into defrost mode while in AC mode Defrost turns on when in the cooling mode Not rated yetI have a 3-ton Bryant 664A, and the system seems to reverse when it is supposed to be cooling. It will start out cooling well (intake is about 86 degrees, … Goodman heat pump blows ice cold air during defrost cycle Not rated yetGoodman Model PHKJ036-1F Hi, i have a 7 year old 2.5 ton Goodman residential heat pump that is blowing ice cold air during the defrost cycle. defrosts too frequently Not rated yetI want to change my defrost interval time on a Lenox HP 26-030. How do I do that? heat pump not working Not rated yetIn heating mode the condenser comes on and runs a few minutes then shuts off it is a whirlpool MN:W2H330A-1ASorry, that page doesn’t exist! You can try our: Quizzes  •  Courses & Training  •  Polls  •  Surveys  •  FlashcardsThe outdoor coil of a heat pump can ice up just like a freezer evaporator.

The tendency to ice up increases with humidity and low ambient temperatures. There is fortunately a convenient method of defrosting the outdoor coil. That is to make the system run in the cooling mode. The outdoor coil becomes the condenser and the ice can be melted away. To keep the heat where it is wanted the outdoor fan motor is temporarily shut off. All this happens automatically and is controlled by a solid state defrost control board. Every so often it will check the temperatures of some thermisters (temperature sensitive resisters) and if a defrost is needed it will activate the defrost mode. Otherwise it will wait for the next trial for defrost. As the system progresses in a defrost it will get to the point where clouds of steam will billow out of the unit. New heat pump owners should be advised to expect this. Otherwise nuisance calls may be placed by the unknowing customer. They have even been known to call the fire department thinking the unit is on fire. In the piping diagram above, place the unit in the defrost mode (Button 2).

Note that the outdoor coil has hot gas entering it which is going to condense into a liquid as it melts the ice build up. There is no danger to the compressor because this liquid must travel through a TXV and evaporator before getting back to the compressor. However simulate the end of a defrost by putting the system back into heating mode. Note that the compressor is now directly sucking the contents from the outdoor coil (liquid) without the benefit of any TXV or evaporator to protect it. You have just seen the need for the accumulator in heat pump systems with reciprocating compresors. There is a trend to use scroll compressors in heat pumps. The manufacturers are omitting accumulators in those units because of the scrolls ability to tolerate some liquid content in the returning suction vapours. The defrost system should get rid of all of the ice everytime it defrosts. If a predetermined amount of time expires the defrost will be terminated irregardless but there should be so little ice left that a successful and complete defrost should be easy to achieve on the subsequent defrost.