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Anonymous Posted on Apr 14, 2014

No fan when ac kicks on Ihave a eb15b funace with a coleman ac

The fan works when heat is on but not with the ac unit

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Todd B

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  • Master 572 Answers
  • Posted on Dec 05, 2014
Todd B
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The heat will normally use a low speed on the fan, & the AC along with the fan switch on the thermostat will use the high speed. The thermostat turns that high speed on when there is a call for cooling & is the same switch if you were to manually turn the fan from auto to on. Try turning the fan on @ the thermostat. If it works, then replace your thermostat. If it doesn't, it could be a bad fan speed, a bad fan relay on a control board or external relay, or a loose or broken green thermostat wire.

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