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I have a heil furnace ac is working heat wont come on?

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Check the white wire is making contact well in the t-stat.
Is it gas heat or electric/heatpump
If gas then check your flame ignition system to determine if it is lighting a pilot or has a hot surface type glow element. If it does not sense the flame it will refuse to run gas for heat and or check that the electric enducer fan is comeing on before the pilot even attempts to light. It must run to prove a draft induction exist for the furnace baffles before it will attempt to start heat.
If it is a heat pump then it should fail to heat side on the reversing valve and not really need to be checked since your AC works. The call for AC has reversed the valve to even get cooling. So it is going to be heat strips failing or sequensers failing maybe even low refrigerant on a heat pump system. I know this is all a bunch to digest remember it is usually electrical and just a loose wire! So start from there and T-stats do go bad just because they can!

Posted on Oct 08, 2010

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Posted on Jan 02, 2017

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