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-   -   Heat Pump Ices Up when cold outside (https://www.askmehelpdesk.com/showthread.php?t=308353)

  • Jan 25, 2009, 10:20 AM
    Pappi1951
    Heat Pump Ices Up when cold outside
    My Heat pump which is a Trane and 20 year old iced up a few weeks ago. The HVAC technician said nothing was wrong , that when the temperature is below freezing I need to turn on the emergency heat.

    I did that a received a $430 electric bill this month.


    I have not had this problem for 19 years. It froze up again last week so I turned on the emergency heat again.


    What could be causing this. Do I need a new thermostat?
  • Jan 25, 2009, 10:28 AM
    hvac1000
    If the unit is freezing up or getting ice on it the defrost circuit is having a problem. Defrost timer,defrost circuit board,defrost sensor,reversing valve or the reversing valve activation coil is defective causing the problem. Call a better service company and tell the to find the defective part and fix it.

    Now I will say 19 years is a long time on a heat pump and you might consider a replacement due to age and the possibilitys of other problems happening.

    I do not believe a new thermostat will cure your problem. The qualified service person who looks at your system will be much better informed than I can be since I am not there to test your syatem.
  • Jan 25, 2009, 10:28 AM
    acetc

    You could be having a problem with the defrost control malfunctioning, this control is located in the outside unit and defrosts the unit on a time and need basis, Good luck, Mike
  • Jan 26, 2009, 11:47 AM
    dac122

    Get a new tech and have them find the problem in possibly your defrost subsystem. That system is there specifically when the temp goes below freezing to prevent exactly this situation.

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