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doc_brown's avatar
doc_brown
Explorer
Nov 28, 2013

Comfort ZC thermostat issues

The thermostat kicked on the heater (gas mode) and after two hours it shut off and displayed no temperature but rather 00 and was not responsive when any of the buttons were pushed. I unplugged it and after an hour plugged it back in and then it displayed a temperature for zone 2 but was not responsive to pushing buttons and would not kick on and would not switch to zone 1. Unplugged it and this morning which was 10hrs later it was responsive and worked but only ran it for 2hrs. This issue has happened the past three winters both in gas and electric mode. This issue has not been a problem when the AC's were needed to cool during the summer. When using the AC's the thermostat temperatures are set and left alone. But when heating I usually change the temperature settings several times from early evening to late evening. Any suggestions?
Class A

4 Replies

  • doc_brown's avatar
    doc_brown
    Explorer
    Jan 03, 2014
    enblethen wrote:
    Some of these thermostats are effected by flourescent ballasts interfering with the signal to AC units or furnaces.
    If you have flourescent lights, turn them off, reset the thermostat, by removing fuse, wait 5-10 minutes, plug it back in and let the system reboot. This could take 15-20 minutes.
    If this solves your problem, one or more of the flourescent ballasts are going bad. Good fix is to convert to LED tubes.


    Found the interference - fluorescent light over the sink. I will be changing that out to LED's.
  • dougrainer's avatar
    dougrainer
    Nomad
    Nov 28, 2013
    enblethen wrote:
    Some of these thermostats are effected by flourescent ballasts interfering with the signal to AC units or furnaces.
    If you have flourescent lights, turn them off, reset the thermostat, by removing fuse, wait 5-10 minutes, plug it back in and let the system reboot. This could take 15-20 minutes.
    If this solves your problem, one or more of the flourescent ballasts are going bad. Good fix is to convert to LED tubes.


    It is not just fluorescent lights that cause this. It is also caused by ac ripple that is sent by another dirty 12 volt appliance. FINDING that appliance is a real time consumer. Tiffins had this problem and they were not using any fluorescent lights in the affected models. Tiffin finally dropped the ZC zone control tstat and went to separate tstas for each roof top unit. RVP is aware of the problem(no fix), but like you, they state to find the offending appliance. Tiffin tried a filter at the connections behind the Tstat, but it did not always work. Doug
  • enblethen's avatar
    enblethen
    Nomad
    Nov 28, 2013
    Some of these thermostats are effected by flourescent ballasts interfering with the signal to AC units or furnaces.
    If you have flourescent lights, turn them off, reset the thermostat, by removing fuse, wait 5-10 minutes, plug it back in and let the system reboot. This could take 15-20 minutes.
    If this solves your problem, one or more of the flourescent ballasts are going bad. Good fix is to convert to LED tubes.

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