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Heat pump auxiliary heat working partially but not fully

simonbernick
simonbernick Member Posts: 1
in A-C, Heat Pumps & Refrigeration

I just had 2 Bosch BOVD-36HDN1-M20G heat pumps with F30-WEHK15A 10KW electric auxiliary heating strips in F30-M20-BVA-36WN1 air handlers installed and it has been a nightmare trying to get the heating to work right.  I live in Chicago so the temperatures drop very low and the auxiliary heat is needed. 

I started with Ecobee thermostats but the auxiliary heat was not working even though the thermostats were calling for aux heat.  I thought it was an issue with the Ecobees so I switched to Nest thermostats and at first the issue seemed solved! But after a week of working great suddenly the auxiliary heat is not working again.  The Nest thermostats are calling for auxiliary heat and I think the strips are providing a little but not the full amount.  I say that because I am able to see how much power the house is drawing and it is about half of what full auxiliary heat usage would be.  

Is there something in the Bosch equipment or Nest programming that would cause auxiliary heat to only work partially? This is really driving me crazy!

Comments

  • ratio
    ratio Member Posts: 3,897

    It sounds more like the heat strips aren't performing correctly.

    is there any reason why the installing contractor won't come out for warranty service?

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 17,175

    You need an amp meter to put on the heat strips to see what is working and what is not. Also, a voltmeter to see if the thermostat is sending the correct signal.

    You could also have a bad defrost board or another issue.

    bjohnhy
  • bjohnhy
    bjohnhy Member Posts: 99

    How much power is your house drawing when it's supposed to be using aux heat? Did you notice what it was drawing when the aux heat was "working great".

    I'm guessing your heat strips arent activating at all. Those two HPs together can pull nearly 10kw on their own

  • EdTheHeaterMan
    EdTheHeaterMan Member Posts: 10,118

    Did the original installation have standard (non smart thermostats) when the system was first commissioned? If yes, does the problem go away when the original thermostats are connected?

    Edward Young Retired

    After you make that expensive repair and you still have the same problem, What will you check next?

    bjohnhy
  • yellowdog
    yellowdog Member Posts: 246

    I've installed a few Ecoer heat pump systems and Nest thermostats will void their warranty. Something to do with them dropping power to a certain terminal and causing the condensers to reset.

    bjohnhy

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