Question about Honeywell Programmable Thermostat Heater

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Thermostat will not turn on for air conditioning

Furnace worked well on heat but air conditioner will not turn on

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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

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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

TheMobilian
  • 8220 Answers

SOURCE: Furnace does not light.

Might be a bad igniter or open roll out switch.

Post your model number and start a new topic on this: http://sublimeforum.invisionplus.net/

Posted on Nov 12, 2009

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Can not get fan on to turn on. All else fine. heat only furnace. No air conditioning...only air circulation.I used to set it on "Cool" and "Fan On"and get air to circulate. Do I need new thermostat?


Since you have two thermostats that operate the heating unit and the fan, and the fact that neither will turn the blower on, I would suspect the furnace/ air handler. Turn the thermostat to heat and see if the heat and the fan comes on, if it does operate normally in heat, the fan relay or the high speed on the blower is most likely the culprit. (If the furnace is equipped with a circuit board, the fan relay is integral to the board, if it an older furnace it has a separate fan relay). If it does not operate normally in the heating mode, verify power to the furnace, see if the flame comes on, if it does: the fan motor, circuit board or the fan relay are most likely the cause. hope this helps!

Jul 20, 2015 | Heating & Cooling

1 Answer

My Ruud Silhouette gas furnace ugdg 07 model blower stays on. The heat and air both work but it is pricing my energy bill higher. Whats the cause and can I just turn off the power to the unit (what about...


Problem could be the thermostat setting in "fan on" mode. Thermostat could be shorted between Y,R and G. Fan relay points soldered together or main board shorted.

Nov 03, 2013 | Ruud Gas Furnace - Excellent Condition -...

1 Answer

I am trying to install a thermostat and I am not sure where to put all the wires... it is for american standard freedom 90 two stage - furnace and air conditioning


Should be like this:

Y from furnace goes to Y on thermostat (yellow)
C from furnace goes to C on thermostat (usually blue)
G from furnace goes to G on thermostat (green)
W1 (first stage heat) to w1 on thermostat(white)
w2 (second stage heat) to w2 on thermostat (black)

Doesn't sound like you have a heat pump but if you do "o" will also have to be connected which is the reversing valve.

Jun 21, 2011 | Heating & Cooling

1 Answer

I have a digital Total Line thermostat that has a blue, white, yellow, red and green wire. Where do I attach these wires to the Model 44300A unit?


Normally Red to R (24v coming to stat) White to W (Heat) Green to G (Blower)
Yellow to Y (Air conditioning) Blue to C (common)
This is assuming you have gas heat and central air conditioning. If you have a heat pump blue would be for that. If you have a volt meter, check voltage between red and blue with furnace turned on. It will be 24 volts approx. if blue is common.

Jan 17, 2011 | Hunter 30124 Air Conditioner

1 Answer

Can I convert a propane furnace to electric?


Actually yes! You can install electric elements in the plenum that turn on by your thermostat. The convection blower from the furnace can be used. You can also install a heat pump system that will give you both heat and air conditioning.

Feb 10, 2010 | Heating & Cooling

2 Answers

Coleman roof top a/c, is the heat controlled by thermostat


hi
on the new colman units (trane) the heat is control only from the t-stat.
i will reccomand a programble t-stat for the new unit.

thanks

Nov 02, 2009 | Coleman Mach III Air Conditioner

1 Answer

Air conditioning runs all the time


I assume this is a manufactured home, this is probably a two transformer system, either your contactor is welded in the on positon or wyou have control wiring issues, (could be the thermostat)

Jul 12, 2009 | Coleman Heating & Cooling

1 Answer

Air conditioning wont turn on either will the furnace.


not being there this hard one! but i can tell you that the thermostat controls both heat and cool.

Jun 24, 2009 | Heating & Cooling

1 Answer

I want to know the conection between the thermostat and the fan and compressor in the central air conditions


r and rc @stat to r on furnace
w @stat to w on furnace
g @ stat to g on furnace
y @ stat to y on furnace
from furnace 2wires going to out side unit typical red & white wire. red goes to y @ furnace and white goes to the neutral of the trans former . BE SAFE turn off power.

r = Red wire Hot
w= White wire heating
g = Green Fan
y= yellow cooling

if their is a B or C @ the furnace terminal board that the neutral . Tom

Jun 14, 2009 | Fujitsu 24C1 Air Conditioner

1 Answer

Air Condition will not come on. We have tried to flip the breaker but no success. The fan on the air condition inside and on the outside is not turning.


If you have one of those new digital thermostats try changing the battery. If your air conditioning is run through a central heating system the power must be on to the furnace. 24 volt control circuit gets its power from the furnace in this kind of case.

Jun 30, 2008 | Heating & Cooling

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