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Carrier heat pump: aux heat does not seem to work

The "Aux HT" indicator went on, however the room temp will not go up.
I change the mode to "EHEAT", the fan on the outside unit stopped, "Aux HT" indicator is still on, however the room temp still not goes up. The air comes out of the vent is warm but not hot...

Any hint what's going on? Thanks a lot!

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  • yeqwang Dec 23, 2008

    thanks. It has been very cold these days....I did not have this problem during the last several years when it was this cold though. .

    How many square foot are you trying to heat?

    >> about 1700
    What is the outside temp?

    >> 10s-20s
    What is the inside temp?

    >> it can not go above 61~ 62 no matter how high I set.
    What size unit (BTU output) do you have?

    >> I do not know... 36000... make sense? a number I figured from the model number...

    some more info..

    When in "Heat" mode and "Aux HT" indicator is on, the fan in outdoor unit won't stop..

    When set to "EHEAT" mode, the fan does turn off.....


  • yeqwang Dec 23, 2008

    yes, I have one meter. can you tell me how to allocate them and do the measurement? I have some knowledge of electricy stuff....

  • yeqwang Dec 23, 2008

    Thanks for the direction!! This helps a lot!

    When I set it to the EHEAT mode and put my hand on the vent goes out, I can feel one side is warmer than the other side... There a pair of coils there...

    I checked the coil. It has reading on both ones.

    I will check the relay and the protection switch...

    Please let me know if you have any other thought!!



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The unit is probably to small for theare you are trying to heat.

When the Aux HT light came on that meant the heat pump could not keep up with the demand for heat. (Probably due to extreme cold, or undersized unit.)

If yu have heat, then at least one heat strip is operating. If you have multiple heatstrips, one or more could be malfuncioning.

Or it could simpy be to cold/to small fr your area and not able to keep up.

How many square foot are you trying to heat?
What is the outside temp?
What is the inside temp?
What size unit (BTU output) do you have?

Posted on Dec 23, 2008

  • 1 more comment 
  • Danny Clark
    Danny Clark Dec 23, 2008

    It sounds like you may have lost one of your heat strips.

    This could be due to a bad heat sequencer (relay) or a bad strip itself.

    If you have a volt/ohm meter I can help you diagnose which one it is.

    Do you have a meter, and would you like to procede in that manner? If not, The next step would be to replace the relay and strip, or call a tachnician.

  • Danny Clark
    Danny Clark Dec 23, 2008

    OK, Turn off the main power to the airhandler. Take the panel off so you can access the heat strips.

    You will need to locate the strips, (probably two, maybe hree strips, only the terminals will be exposed.)

    disconnect the two wires on each strip. (one wire on each terminal.) Check for continuity accross the strip. If you have continuity, the strip is fine.

    To check the heat sequencer/realy, you will need to turn power back on (Be sure to reconnect the strips just as they were connected before) and check for amperage going to the strips.

    (Make sure the t-stat is calling for heat, set on e-heat)

    Each strip should have 15 to 25 amps.

    Whichever strip does not have anyamp draw, thats the problem strip. Now if it has continuity, you know it must be the relay to that specific strip.

    The relays are usually sigle or double stack.

    The 24volt coil is at the bottom with terminals on each side.

    The realy sends power accross rom the line side to the power side to power up the strip.

    If you have 24V across the coil, and you do not have 240V on the line side of the realay, the relay is bad.

  • Danny Clark
    Danny Clark Dec 23, 2008

    how many amps did you have on each coil?



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SOURCE: Carrier heat pump: aux heat does not seem to work

you have a heat pump which removes heat from outside air when it is too cold out below 30* the unit can no longer produce heat and electric strip heaters kick in

Posted on Feb 06, 2009

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