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Outdoor heatpump unit,twx736a100a2, coils freeze over solid,replaced outdoor thermastat, checked freon and replaced a relay switch at a cost of $500/for 2 service call-outs.It worked fine whole month of a very cold dec.We had 2 days of 50' weather and now its back down in low 30's and coil froze solid again! should i call another tech.?whats next? reversing valve? control board?,thanks..going broke in ohio

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Coils freezing due to dust blocked coils and or air filter or short of gas. Service your unit completely.Please do not change any spare/s without knowing exact problem. Please follow the steps given below.

Toget proper heat, keep your temp setting at 30+ degree and also mode in "heat"position. If still no heat, check your heating sensor for closed circuit by anOHMs metre.It it's with RV, check power to RV.If it's with heatingelement check power to element. If power is there but still no heat meanselement defective. Replace new heating element. Thanks. To get proper cool, keep the tips as follows:
1. Check air filter is cleaned. 2. Check indoor coil is cleaned. 3. Checkindoor blower motor is working. 4. Keep in cool mode. 5. Set temp minimum 3degrees less than room temp.6.Check compressor is working with correctpressure.
Thanks. Helpful?

Posted on Jan 04, 2011

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THERE is not a whole lott left not quite sure what all you have had done by post but i will let you know that the unit will run on a timed period based on outdoor defrost control board and once that time elapses and unit is still runnning it will check the defrost thermostat on the coils if the coils are cold enough (ie: frosted) the thermostat will send a signal back to board to go into defrost. the reversing valve actually switches back over to a air conditioner while mean while your indoor supplemental heat comes on rather it be electric or gas if they have it wired right. so that being said you could have a bad defrost control board if they have already replaced the thermostat outside. also if unit is low on refrigerant will freeze up ...lastly i want to point out not sure what your location is but when it gets down to 30 degree temps the heatpump will frost up it shouldn't be a block of ice but will frost up and look like snow on in completely normal. i tell people here in texas with heat pumps anything below 35 to go ahead and run the emergency heat just so you have warmer air and a stable home temp... yes it does use more electricity initialy ,but if you can warm a house in 2 hours with e-heat and it takes the heat pump most of the day running what is really costing you more? hope this helps and good luck to you please vote

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