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Old 04-03-2010, 10:42 AM   #1
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Location: West Coast
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micro amp thermostat

DV-35 Empire. Direct Vent furnace.

Ever hear of a thermostat wire developing a short in it, 10 years after it was installed?

The electricity is generated by a pilot heated thermo-pile, no line voltage (110VAC)


Last edited by okrite; 04-03-2010 at 01:24 PM.
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Old 04-03-2010, 12:02 PM   #2
An old Tradesmen
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micro amp thermostat

It happens.

It also often happens that the short is in the heater itself.

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Old 04-03-2010, 03:37 PM   #3
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micro amp thermostat

Thats a millivolt system, and should have a millivolt thermostat. Have you tried to bypass your thermostat? Just remove the 2 wires and twist them together and see if the burner fires. You're dealing with less than 1 volt, so don't worry about shocks.

Usually the wire should last forever, unless someone clipped it or an animal ate through it.

Last edited by beenthere; 04-08-2010 at 03:00 PM. Reason: Removed link to another forum
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Old 04-03-2010, 09:46 PM   #4
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Location: West Coast
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micro amp thermostat

Lady said it went on one time and did not turn off. Had a pro out there twice, said he jiggled the wire and it is working OK.
Don't really like the situation.

She put in new baseboard and maybe grazed the wire with a nail. She has a cat, maybe he chewed it up. I thought the tech would fix it but said something to the tenant about having to pull sheet rock gave her a bill and left.

He said the first time he looked at it he could not get it to malfunction.

Was thinking about a wireless stat. ECS makes a battery operated wireless for that unit, so I'd have put the receiver in a cut-in box next to the heater, the stat would mount where the old one is.

Or just put a new stat and new wire closer to the D-V heater.

She 's got a gucci paint job and I'd have to drill some small holes and make few back rock patches for a whole new line. Then match the paint and all.

I have a friend in the business who seems to know a little more about these type units and their problems.

Guess I ought to check it myself and see if there is any bad insulation near the stat or heater. Maybe when they did the baseboard they bumped the wire too close to the Hx.

Beenthere said might be a short in the unit itself.

Last edited by okrite; 04-03-2010 at 10:17 PM.
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