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My Trane thermostat # TCONT800 will not respond to interactive touch commands. Batteries have been replaced. A C unit and fan are running but I can not change and mode or settings.Thermostat will not light when touched.

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Chances are you have a bad tstat But make sure you have 24 volts to the stat also. Russ

Posted on Jul 26, 2009

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I'm having a similar issue, only mine has some buttons that respond but most do not. This seems to be a common issue... Original HVAC dealer that installed is out of business. I called another Trane Authorized dealer and talked to a tech. He said the t-stat is bad and needs to be replaced. It's still under warranty but guess what, $99 to come out and write it up as broken (mandatory for warranty) then $60 to replace. It's 2 screws and 4 wires - I can install it in 5 minutes but they said no. I called around and everyone wants to charge a similar amount. Am I naive in thinking that a part that breaks under warranty should be replaced by the manufacturer for free? It just rubs me the wrong way that I'm asked to pay $160 to replace a warranted part.

Posted on Aug 05, 2010

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