I want to change (digital) thermostat and replace it with (non-digital) non- programmable thermostat. The thermostat I'm wanting to use only has spots for 4 wires. Which leaves 2 remaining wires. Which are a must?

  • Shoot us a photo of the old wiring. Also model numbers of old and new. – Harper Dec 26 '18 at 20:12
  • Can you post photos of the wiring at the furnace end? Also, are you replacing a thermostat that's known-bad/malfunctioning, or trying to correct an issue with the system as a whole? – ThreePhaseEel Dec 26 '18 at 23:36

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