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toymech 10-24-2008 01:15 AM

heil t-stat issue
Hey great site. I have a heil ultimate III furnace in my house I bought 8 Months ago. When i moved in I put in a Noma digital 5+2 tstat, works great. Last week got a noma digital 7 day tstat, hooked it up and the furnace just cycles the draft motor on and off in about 15 sec intervals. I took it back got a new one, same thing. The old one still works fine. I am an automotive tech so I started trying to figure out what was happening. An ohm meter shows both tstat's the same. accidently (sort of) I grabbed the two wires (one in each hand) and the furnace did the cycle thing. The 7 day works fine when calling for heat, but acts up when off. Any ideas? Thanks in advance

hvaclover 10-24-2008 04:13 PM

Bleeding voltage back.

Need an isolating relay.

toymech 10-25-2008 07:01 PM

Hey Thanks. Got thinking about what you said and remember seeing an automoyive relay with a capacitor or resistor in it to stop arcing of the contacts. So I took the stat apart and sure enough there was a cap and resistor linking the two contacts together, so I cut the resistor. Works great now:) Thanks again

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