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We installed a programable thermostat and it worked fine with the cooling system but now the heat won't work. could it be hooked up wrong?

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  • acehigh3710 Nov 25, 2008

    we checked the wiring and it is ok, then we shut of the power for ten minutes with no luck

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Yes ,,, be sure you have a jumper from red to heat / larry

Posted on Nov 25, 2008

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Try reprogramming the thermoatat, if thats no good then have a look at how you installed the thermostat and if you have done it correctly, rectify it if you have not and try again.
if that fails the thermostat itself may be faulty

kind regards

Posted on Nov 25, 2008

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It is possible. Several system checks that you can make before deciding that would first be sure that your thermostat is switched to heat instead of cool. To the right for heat, to the left for cool.

Second test, using your up button, run the temperature up to at least 80 degrees, this would eliminate any wrong temperature settings that may be presently in the unit.

This way, if the heater doesn't come on with a manual setting, the wiring connections to the heat side could have been switched.
Bill

Posted on Nov 25, 2008

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Sorry, but there is nothing wrong with the thermostat.

The problem is in the furnace. In heat mode all the thermostat does is close one switch; heat on or heat off. The furnace does the rest. So if the furnace fires up the thermostat is working.

Your cool and "fan on" both work on a high fan speed through a relay.

Heat is at a lower fan speed, usually medium or medium high. You have something wrong in that part of the circuit. It could be several things depending on the model, age and type of furnace. It could be a bad speed relay, a bad fan switch, a bad furnace board, (speed relays are often built on to the board), or even a loose wire to the blower motor (heat) or bad winding in the blower motor (medium) so it only works on high.

You should keep the fan switch on any time you heat as the unit heating with the fan not running will cause it to overheat which is very ******* the furnace, could damage it, and is a little dangerous.

Call for service right away please.

Good Luck.

Posted on Nov 25, 2008

  • taran_2005
    taran_2005 Dec 14, 2008

    any development?

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Check all wiring to the thermostat, try aso cutting power to main system for ten minutes to reset the system.

Posted on Nov 25, 2008

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