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Posted on Sep 10, 2011
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Only works on manual control, not the automatic thermostat function. How do we repair this? Do we need to replace the toggle switch? Addl. # on switch: 1HP1-2PH125-480VAC, 1HP3-PH125-600VAC.

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  • paminapat Sep 11, 2011

    Thank you very much, however, the thermostat seems to respond to the set temp well. The thermostat brand is Trane #E50023. What do recommend? Do you still think the toggle switch is ok?

  • paminapat Sep 11, 2011

    Excellent, timely response. Thanks McNeB!

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  • Master 2,418 Answers
  • Posted on Sep 10, 2011
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You probably need a new thermostat. You did not say make or model number. The auto function is a temp operated switch, or a thermostat. That part is most likely bad. If it will run when your turn it on. The Toggle switch is ok.

  • Anonymous Sep 11, 2011

    When you use the toggle switch does it seam to do anything? if it makes some change then it would not be bad. If nothing happens then that may well be the problem. If you have access to a volt/ohm meter, unplug it. Take the grill off and try to see if the switch has proper function with the meter. It sounds like you know how to get to the controls, not to hard to check them with a meter.

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