Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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After RTH6400 installation heat strip is no longer actuated

I ahave an American Standard airconditioner-heat pump unit that has a heatstrip within the inside exchanger unit Prior to installing the programable thermostat the heat strip would engage to bring temp up quickly. Now, the heat strip does not come on at all. The manual does not seem to address a unit with both a heat strip and a heat pump. How can I get our heating/cooling system to work as it used to?

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Http://yourhome.honeywell.com/Consumer/Cultures/en-US/Products/Thermostats/Do-It-Yourself/Programmable/5-1-1/Default.htm look at the very last part of thius page and you will see that the particular thermostat does not work for heat pumps tha have auxillary heat. Sorry for being the bearer of bad news but you need to upgrade the selection to make it work right.

Posted on Jan 25, 2009

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