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Honeywell th4000 thermostat - fan won't come on. The system set to cool and the temp is set lower than room temp.

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That problem is seldom the thermostat.check all fuses and breakers....if they're ok,its prolly an internal problem to the furnace.

Posted on Aug 24, 2008

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I have Honeywell Pro TH4000 series. The fan wiil not come on what do i do


Depends on what type of heat you have...gas, oil , electric, heat pump? Make sure it is the right thermostat for your heat source. Some thermostats have a switch on the back for fuel or electric.

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I have Honeywell Pro TH4000 series. The fan will not come on what do i do


It really depends on the circumstances. Are you just trying to turn the fan to the "ON" position from the "AUTO" position? If that is the case, there will be a problem with the thermostat, wiring to the thermostat, or the unit itself. That would sum up a "thermostat" problem for the fan not working. If your trying to call for HEAT/COOL and the fan isn't coming on, that is another issue.
You can try to see if the G terminal is hooked up on the thermostat, that's going to be your "FAN" terminal. If it is connected, you will have to go to the unit and see where it is connected. At this time, we would need to know the model and manufacturer of the unit. Thanks, hope it helps.

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Yes,
Most all the Honeywell t-stats can be calibrated...
check out this tip to find the manual for your t-stat and then how to get into the installer setup program...

Manual Honeywell How to Find Honeywell Manuals
http://www.fixya.com/support/r3894275-manual_honeywell_find_honeywell_manuals

heatman101

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check to differential setting in the thermostat and are you saying the temp in the room and the set temp is being read from the thermostat or is there another thermometer in the room your looking at

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Heat/cool wires crossed. RC- is red cool make sure the batteries are good and room temp is higher than cool setting. good luck

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