Question about Honeywell Programmable Thermostat Heater

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No heating system is turned on to heat but no heat comes through the ventsjust cool air.

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  • roydevesh Oct 29, 2008

    i turn it on to heat only air comes no heat

  • owenskr2002 Oct 29, 2008

    Electric heater, just installed the programable thermostat and we are having the same problem. Air is blowing out, but it isn't hot.

  • msbrown21 Oct 29, 2008

    i'm having the same problem with a newly installed honeywell rth7500. it worked fine when we first installed it earlier today and now the system just blows cool air

  • Anonymous Dec 22, 2008

    i have a 93 cherokee jeep and their is no heat comming out of the vents

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We had the same problem and then had to pay $60 to have the guys who installed our original system tell us we just had the settings wrong. We thought we had "electric heat/cool", which is what we set the thermostat for. Turns out we have "auxhilary heat pump" or something like that. We don't have gas heat, it's electric, but apparently its not basic "electric heat/cool". So try changing your settings. Good luck!

Posted on Oct 30, 2008

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1 Answer

Does the fan operation bring in outside air or just circulate air inside the space?


The fan is the same one use to circulate air thru the heat or A/C coil. When set to auto, the fan only comes on when the thermostat senses that it needs to add heat or cooling to the space. When set to on, the fan runs regardless of whether or not it is adding heat or cooling on not.

Mar 13, 2015 | Thermostats

1 Answer

Hey, I purchased your Honeywell RTH2510 Thermostat, but I didn't even think to label the wires when I took the old thermostat off. Upon installation of the new Thermostat (2510) the Air Conditioning...


The connections that you really need to reference would be at the air handler itself. That would tell you which wires go outside to the heat pump and which wires go to the air handler. I can however give you some basics that may help.

Heat Pump Wiring
Terminals/Colors/Function
R- Red- 24v power supply. (Usually a jumper between RC/RH)
G- Green- Fan
W- White- Heat (Sometimes W1-W2, first or second stage heat)
Y- Yellow- Cooling (Same applies as above i.e. Y1-Y2)
C- Common (Most people use blue unless it is used for B terminal and sometimes cooling on older 4 wire systems.
B/O- Reversing Valve for heat pump. Either powered heating or powered cooling, depending on system installed.
Aux- Also used for heat.

Note: Considering that the installer had their own way to run all wires, use different wires, connections, etc. This is just a reference to common wiring in the field.

How the most common system is hooked up:
Thermostat:
Red wire goes to R terminal
Yellow wire goes to Y1 or Y2 terminal
Green wire goes to G terminal
White wire usually goes to W1 or W2 terminal
Orange or Black wire goes to B/O terminal
Brown wire usually goes to Aux terminal
Blue wire goes to C terminal, unless its being used as stated above.

This is without using a fossil fuel kit or zone control board.

Where do they go from the thermostat?
Red
goes to the air handler transformer or board and goes outside to heat pump to power low voltage controls.
Yellow wire goes straight outside to Y terminals on heat pump unless going to a board inside first.
Green goes to the air handler fan relay.
Common goes to the air handler and outside to heat pump.
Black or Orange will go outside to heat pump terminals for reversing valve.
White usually goes outside to heat pump,and inside to air handler. Will explain reason further down.
Brown will go to the air handler to the heat relay for the emergency heat.

On a call for heat, with a powered cooling system (more common).
The R, Y, and G terminals energize, sending a signal to start the blower and pull in the contactor outside. Note that the Y terminal is usually cooling, but since this is a powered cooling system, the reversing valve is not energized, causing the system to run in heat mode. If you have powered heating, the reversing valve terminal will energize also. Depending on thermostat, if you set the temp substantially higher than room temp, it may kick on the emergency/aux heat to quickly raise the room temp. On a call for emergency/aux heat, the R, G, and E/Aux terminals are energized, turning on the electric/gas heat instead of the heat pump. This comes in handy since the heat pump can only pull so much heat from outside before its not enough to properly warm the house, usually around 30 degrees outside temp. If you are running the heat pump and the system goes into "defrost", the outside unit will send a signal back to the air handler, through the white wire I mentioned earlier, to tell the emergency/aux heat to come on while it is in defrost mode, providing heat whenever needed.

Again, this is just a reference guide to some basic wiring, but hopefully it will tell you where the problem is or at the least, give you a good start. There are variables in which things can change the wiring like a zoning system or fossil fuel kit. Even then, you should be able to get pretty close. Hope this helps and Happy Holidays!

Dec 07, 2013 | Honeywell Programmable Thermostat Heater

1 Answer

I installed a new honeywll themost and it will t witch system to cool/display shows up ut warm air till comes out/before changing did not have this issue


It sounds like you may have switched the heat and cool wires. The cool wire should be Yellow to the Y- terminal and heating wire should be the White wire to the W-terminal.

Sep 22, 2013 | Honeywell Programmable Thermostat Heater

1 Answer

Heat Pump - blows heat to set temp, then off, then kicks on to blow cold


Heat pumps defrost which is the AC mode, if the heat strip isnt working during a defrost, the air will be cold, A heat pump only feels warm if the heat strips are on too! the refrigeration cycles heat output is much less sensible to our 98F skin. heat pumps that satisfy a room setpoint are working at least, all heat pumps feel drafty to most.

Oct 28, 2012 | Honeywell Programmable Thermostat Heater

2 Answers

Flame symbol showing on theremostat


It's not your thermostat. Go to where your heating system is and give us a make and model number so we may help you.

Feb 11, 2010 | Honeywell Programmable Thermostat Heater

2 Answers

Three wire system, going to a five terminal thermostat? Wires from wall are red, white and blue. Terminal on new thermo is yellow ,green and then on the next row is,Rh, Rc, and w How does that work out? My...


The Rc and Rh should have a jumper wire between them let it in. and hook the red wire to one of them it does not matter which one as they are jumpered. The white wire goes on the "w" terminal and the Blue wire will go on the "G" green terminal to run your fan.
This should get you up and running again!

Nov 13, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

Honeywell heating system


go to the main power box and find the either breaker or fuse that runs the system and turn it off

Dec 25, 2008 | Honeywell Programmable Thermostat Heater

2 Answers

Heat pump that just blows cool air


is the condenser operating? what is the outdoor temperature? A heat pump is a cooling system with a reverse gear, most reversing valves which make this possible fail to the heat mode so it is not likely to be the problem. You should have either gas or electric back-up heat. If you switch to emergency heat do you get warm air? Really need to find out more to make an informed guess at your problem, the simple stupid would be is the circuit breaker to the condensing unit possibly tripped or shut off?

Dec 18, 2008 | Honeywell Programmable Thermostat Heater

3 Answers

Honeywell thermostat....Home cooling/heating system....Chromotherm III


On heat pumps, the normal setting is simply an air conditioner working in reverse. The EMT or AUX heat is a supplemental heating system using electric heating elements instead of the hermetic (compressor) system. As far as why the regular heat does not work it can be one of many things. low freon charge. reversing valve not functioning. The defrost cycle not working. Take your pick. you may want to call a service man to repair it as the electric (EMT) is not as efficient.

Oct 26, 2007 | Honeywell Programmable Thermostat Heater

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