I am trying to install a Nest thermostat.

It says Rh not powered. I checked with a meter and I get approx 8 VAC reading.

What could be causing this?

Nest Error

The furnace itself ain't pretty.

Furnace clusterf@@@@





  • 1
    1) What did you use for neutral/return when measuring the voltage? 2) What is the voltage on that line right at the furnace? – Carl Witthoft Apr 27 '16 at 11:26
  • 1
    The wiring for the thermostat is in the bottom portion of the furnace (just about where your photo ends). – Tester101 Apr 27 '16 at 11:38
  • Can you get us a better photo of the wiring? – ThreePhaseEel Apr 27 '16 at 12:20
  • @CarlWitthoft I opened a light switch and used ground, but also checked between Rh and C. I can confirm when I get home. – ryanwinchester Apr 27 '16 at 20:44
  • I will get a better photo after work. And can check voltages again, too – ryanwinchester Apr 27 '16 at 20:44

I had a furnace guy come in the morning. He saw the furnace and said "Oh my god!"

After two hours he decided he couldn't figure it out and they sent another guy later that day.

They finally figured it out.

Since a guy who works with furnaces for a living couldn't figure it out after two hours I think I never had a chance to begin with.

So in the end, the answer was:

Call a pro.

|improve this answer|||||
  • Yeah -- what did the pros find, btw? I'm curious... – ThreePhaseEel May 1 '16 at 3:41

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