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I have a Honeywell TH6110D1005 thermostat. I do not use the program mode, I keep my temp set to 71° at all times when it is on the Cool setting.

Sometimes, it resets itself to 65° for no reason whatsoever. I have replaced the batteries with new red Duracells but it happened again.

It is intermittent and it can go weeks without doing this.

I can't figure out why it is happening.

  • Can you provide the thermostat with a C wire from the 24VAC transformer? – ThreePhaseEel Nov 19 '16 at 1:23
  • I am really not that sure. I don't know if the transformer is actually hooked up. – MB34 Nov 22 '16 at 19:34
  • Can you post photos of the wiring configuration at the 'stat and at the HVAC unit? – ThreePhaseEel Nov 22 '16 at 23:17

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