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How to use a thermostat - Honeywell Air Conditioners

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Posted on May 27, 2008

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My air conditioner thermostat keeps losing power


The power for thermostat come to an from the thermostat with the red and common wire. Check for proper connection to thermostat and check thermostat wire from the thermostat to the air handler. Technicians sometimes do not install splices well and sometimes the splices comes loose. I prefer using rtv loaded wire nuts to make splices when I can find them. Another cause for this problem is bad insulation on thermostat wire allowing wire to short out. If this is your problem, you need to replace the thermostat wire itself. If these do not fix your problem, you may need to replace the thermostat itself.
Hope this helps

Oct 20, 2014 | Air Conditioners

1 Answer

I HAVE A HONEYWELL MANUAL THERMOSTAT NO BATTERIES ALL IT HAS ON THE BACK IS T8400C 1099 (2) 0710 1B HELP, IT DOES NOT SHOW ANY THING THE SCREEN IS BLANK


This model of Honeywell thermostat uses the 24v from the unit to power it. One of three things must have happened.

1. You have lost power to the furnace, therefore no power to thermostat.
2. You only have 4 wires hooked up on the thermostat and not 5. A lot of older homes had just 4 wire running to the thermostat, which will not work for this thermostat. You should have a wire connected to the (C) or (B) terminal on the thermostat, which ever one they have, I can't remember off hand. These are the Common terminals. They have to have the common from the furnace 24v power to operate.
3. Faulty thermostat, which will obviously have to be replaced.

Hope this helps and gets you to cooler days!

Jun 28, 2012 | Honeywell Air Conditioners

1 Answer

How do you install the thermostat?


Hello my name is Heath it will be my pleasure to assist you. Red wire to R terminal on the urnace and the thermostat. White furnace and the wire to W or w1 on the thermostat nd the furnace, Use the brown wire on the W2 terminal of the furnace and the thermostat., Yellow wire to the y or y1 terminal on the furnace and the thermostat, Green wire to the G terminal on the furnace and the thermostat, Use the black wire to common on the furnace and the C terminal of the thermostat, Use the blue wire on the Y2 terminal of the furnace and the thermostat if you have a two stage air conditioner.

Sep 05, 2011 | Air Conditioners

3 Answers

Installed a new Filtrete thermostat on a new Carrier high-efficiency furnace. I followed instructions exactly. It doesn't work. What did I do wrong? Furnace was installed in December. Broom handle...


Hi smargyle,

Welcome to fixya!

I can provide you with diagrams for the old Carrier therm and for the new Filtrete therm. But, I would need to know what the model numbers are for each therm plus how many speeds AC you have.

Please reply back with that information and we will get your AC back in working order.

Thanks,

Handie Andie

Jul 22, 2011 | Air Conditioners

1 Answer

Thermostat no power


Hello Friend,

No power to air conditioner ? Reset circuit breaker or change the fuse.

Thermostat dirty ? Clean the thermostat.

Thermostat faulty ? Replace the thermostat.

Thanks & Regards,
Viju

Apr 03, 2010 | Carrier Air Conditioners

1 Answer

I have a Rheem Gas Furnace with an old analog thermostat (Wires conneected to terminals R and 4 for the thermostat). I went to install a Rheem digital and programmable thermostat and it indicated that it...


if you have 2 wire at thermostat Terminals at furnace that the thermostat wire attach to should be R & W if your new thermostat has R & W terminals is should work, an easy thing to remember is the red wire on R the white wire on W. If 4 wire at thermostat at furnace green on G, Blue on Y, red on R,and white on W same at thermostat If these do not match find a thermostat with these terminals

Dec 06, 2009 | Air Conditioners

1 Answer

We have a duo therm rv analog thermostat. When we opened it up none of the 7 wires were attached. Do you know the wiring code?


red wire to the r section of the thermostat white (heat) to the w marked on thermostat Green (fan) to the g marked on thermostat yellow (a/c compressor) to the y marked on thermostat. Blue to the c marked on thermostat. Orange to the orange marked on thermostat.

Oct 30, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

How to program Honeywell thermostat for remote sensor


Remote Sensor (Setup Function 0340): If an optional outdoor sensor is installed, the thermostat can display the outside temperature. If an optional remote indoor sensor is installed, the thermostat will display the temperature at the sensor location (the internal sensor in the thermostat is not used).
\ 0 No remote sensor
1 Outdoor sensor (display only)
2 Outdoor control sensor (select heat pumps

Dec 31, 2008 | Honeywell Air Conditioners

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