There is no off selection for the fan. It likely has on or auto, but, it possibly has "circ." This will randomly bring the fan on with no call for heating or cooling. Keep your fan selector in the auto position, system to whatever you need!
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SOURCE: installing a honeywell CM900 wireless programmable thermostat
the analog unit uses just two wires for heat. red - white. there is a heat anticipator setting that must match the burner current. check your programmable specs and follow instructions.
SOURCE: honeywell th4000 thermostat - fan
That problem is seldom the thermostat.check all fuses and breakers....if they're ok,its prolly an internal problem to the furnace.
SOURCE: Honeywell Thermostat RTH 7500
Assumed all the wiring are correct,
to change from manual switching from heat to cool, press [system] button ( left ) to go into system setting.
then press and hold the [fan] middle button untill option display 120
use up down button to select option 300 ( Manual/Autochangeover) ,
select 0 for manual, 1 for automatic. ( read caution in page 22 of installation manual )
Good luck
SOURCE: Installing Honeywell RTH7000 - I have too many wires!
check to see if the B terminal is on the new t-stat if connect to it , but this terminal refers to heat pumps and is normally use to energize the reversing valve on the outside unit and not used on ac units , but normally the tag O/B is the same terminal on therostats
SOURCE: New honeywell thermostat on new gas furnace not working
sometimes there's a differential setting anywhere from 1-3 degrees, see if you can make sure it's down to 1
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