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No auto fan when heat is on.

When the heat is on and the blower is set to auto, the blower does not work but if I set the blower at the thermostat to the on position the blower works and the heat also.

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Check to see if the t-stat is set for gas or electric. should be on the back of t-stat

Posted on Jan 25, 2009

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Posted on Jan 02, 2017

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Could be a bad blower motor resistor,mounted by the blower.

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What is difference between on an auto on thermostate


I'm not sure exactly how this applies specifically in a car, but on a home heating and cooling (air conditioning) thermostat, it is often associated with the fan or blower setting.

If for a system fan:

"Auto On" setting in a heating / cooling system would start the fan when the temperature climbed above or dropped below the setting you on the thermostat and start the heat or cooling source. Once the thermometer indicates the desired temperature had been reached, the heating / cooling source would be stopped and the fan would turn off.

"On" would run the fan all the time, regardless if the thermostat tired to start the heat or cooling source. This would result in constant circulation of the air in the space(s) and tend to keep warm or cool spots (rooms) from being created.
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Eb20b/ electric furnance/ blower wont shut-off after heat kicks out, got to kill breaker , runs all the time, installed new thermostat, no change?????? Its cold??????


Check the thermostat and make sure the fan switch is set on "Auto". If it is set on "ON" the blower will run constantly.

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so with system setting cool/ fan setting auto, the condenser runs but the indoor blower does Not? but when system setting cool /fan setting on, the condenser runs and the blower runs?

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My Goodman air handler blower will not turn on when Thermostat is on auto fan. The blower comes on when themostat is set on fan-ON. The thermostat has be replaced, also the capacitor, and the BTDR. The...


Hello,Next is make sure the thermostat is set for ELECTRIC heat.In the back there is a dip switch or sometimes a small jumper that MUST be set to ELECTRIC setting.It will give a choice GAS/ELEC it needs to be set ELEC to bring on the BLOWER on a call for heat.It doese'nt matter if you have gas or oil or wood for fuel.

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Try the fan"on/auto"function switch at the thermostat when the compressor is on.Set fan to on.Does blower run?

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Rheem RHQA Heater:Blower works but no heat.


Is there a setting on the thermostat for Auto or Fan? If so, make sure it is in the Auto setting. You will have a contactor that turns on the elements and a relay for the fan. Follow the wiring diagram to see which relay energizes the fan then unplug it to see if the fan stops.

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I have an intertherm electric furnace FEH-A020, with multispeed blower installed when A/C added. My problem is blower operation. at the end of the cooling season with fan set to auto operation the fan ran...


The model of T-stat you gave comes up as a discontinued model on Honeywell's web site, but it looks to be a manual stat that type of stat would have to be wired with a summer winter switch with electric heat, allowing it to turn on the fan with a call for heat. If yours is a programmable T-stat you would need to select electric heat or in the installers set up change the default setting for fan from unit controls fan in heat to thermostat controls fan.

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The fans are set to delay for 60-90 seconds to remove all heat from the heat exchanger/heater elements.

If the fan runs any longer than 3-4 minutes after the Emergency Heat shuts off, you may have a bad sequencing relay in the air handler.

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