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-   -   I am replacing mercury thermostat with honewell RtHL2401C only auxiliary heat works (https://www.askmehelpdesk.com/showthread.php?t=771908)

  • Oct 19, 2013, 01:19 PM
    Bob Backover
    I am replacing mercury thermostat with honewell RtHL2401C only auxiliary heat works
    I am replacing a mercury thermostat with Honeywell RTHL2401C. Auxiliary heat is the only heat that will work. Is it a programming problem or a wiring problem?
  • Oct 19, 2013, 04:36 PM
    Grady White
    Hard to tell. Did you follow the wiring instructions which came with the stat?

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