Question about Honeywell Programmable Thermostat Heater
Furnace worked well on heat but air conditioner will not turn on
Turn fan to on position to see if fan runs. Is this new tstat. Digital or manual tstat. If digital check back of tstat to see if tstat is set to gas heat. Rus
Posted on Jun 21, 2009
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Posted on Jan 02, 2017
SOURCE: Air and heat not working!
check to see if thermostats take batteries pull the cover off and check and change them if they do. if they don't take batteries there will be a wire hooked to terminal C on the t stat. if they are new t stats they need to be programmed for your equiptment in order to work. some new digitals have a 5 minute delay after you set them. when it's in the delay HEAT or COOL will flash off and on, if it is actually calling for either one the words will be solid.
Test the thermostat: TURN POWSER OFF TO FURNACE. either at breaker box or switch mounted on furnace. make sure the door panels are all on furnace cause there is a door switch on the bottom panel that cuts power if it isn't pushed in.
while you have the cover off the t stat if the
batteries didn't fix it take wires from R and W and wire nut them together. the heat should come on after you return power to furnace
and/or making sure the power is back off
take wires off R G and Y terminals and wire nut them together AC should come on. if they do come on you have a bad t stat. if not you are losing voltage somewhere. either at the breaker box or furnace. a fuse could be blown on the circuit board on the furnace. if the fuse is blown you have a short in the stat wire. also check the fuse on that furnace switch we talked about earlier. if you have a volt meter take the bottom door panel off furnace making sure you push and hold that door switch in with a piece of tape. see if you have 120 volts going into the transformer the wires to test will be black and white. if so check to see if you have 24 volts accross the other two wires on the transformer if so see if you have 24 volts on the terminals R and C on furnace board. if so put a jumper wire on R and W heat should come on. if not it's the circuit board. any where you lose voltage is the part that is bad.
Posted on Aug 08, 2009
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