Question about Honeywell Programmable Thermostat Heater

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How can I tell if the thermostat is broken or not?

The AC/fan/heat won't kick on even though the digital readout is reading (from the battery backup). Checked all the breakers - all "on". Hit all the "reset" switches... can it be the thermostat?

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Before going to electrical components ,please firstly check the power supply ,then the electrical wire to the heater and so on .

Posted on Oct 05, 2009

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My thermostat isnt kicking on my furnace. even if i use the arrow to increase it, still no heat and it isnt kicking on the furnace. even tried changeing the batteries. sometimes it will say,"return" n


Recheck that the thermostat is wired correctly. If so,switch it to fan on and see if the fan comes on if the fan does not come more then there is definitely an issue with the furnace and not the thermostat.

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I have a Frigidaire heat and ac unit. Model FAZ12HR2A. Fan kicks on but has no heat coming out?


Turn your AC on and see if it is blowing cold air. If it isn't, it is most likely the "blower" that has gone out. Also check the thermostat and try putting in new batteries (even if it appears to be working). Another thing to try is to make sure you have changed your filter. A dirty filter can block the air flow.

Nov 14, 2014 | Heating & Cooling

1 Answer

No fan when ac kicks on Ihave a eb15b funace with a coleman ac


The heat will normally use a low speed on the fan, & the AC along with the fan switch on the thermostat will use the high speed. The thermostat turns that high speed on when there is a call for cooling & is the same switch if you were to manually turn the fan from auto to on. Try turning the fan on @ the thermostat. If it works, then replace your thermostat. If it doesn't, it could be a bad fan speed, a bad fan relay on a control board or external relay, or a loose or broken green thermostat wire.

Apr 14, 2014 | Coleman Home Electric Furnace Eb15b/Eb15d

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Honeywell Thermostat RTH6350 makes heat run in AC mode after AC runs


Well, if it wasn't doing that before then you more than likely know its in your wiring. Cools down then heats back up sounds like the auto change over is on, and the heat setting is higher than the cool setting?

Mar 02, 2017 | Heating & Cooling

1 Answer

My thermostats seems to be stuck. I set the AC to 80 and it keeps running despite the room getting down to 63 degrees.


Either your thermostat is stuck or the sensor detecting the room air is broken. If their is a digital readout telling you the room is down to 63 then I would say the thermostat is stuck but cannot be confirmed without checking with a meter

Aug 17, 2010 | LG LP6000ER Air Conditioner

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I HAVE A 2007 CHEVY COBALT THE CHECK ENGINE LIGHT CAME ON I CHECKED THE COOLANT TEMP GAUGE THE DIGITAL GAUGE READING WAS ONLY SHOWING THREE BROKEN LINES. I CHECKED COOLANT LEVEL WHICH WAS FINE. ENGINE DID...


I had this problem with a 2007 Chevy Cobalt. I changed the coolant sensor and even though the check engine light went out I still had a reading of "---" on the coolant gauge. The problem is most likely one of three things: a low coolant level, a bad coolant sensor, or the thermostat needs to be replaced. The only other possible thing it could be is a bad BCM (Body Control Module) which in that case you would most likely be having other weird problems.

The Thermostat and the sensor are both very easy to get to and replace. Take off the engine cover by removing the oil cap and they are both to the rear of the engine on the driver's side. They are right next to each other.

Hope this helps!

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2 Answers

The furnace wont turn on even though it says it is


not all digital thermostats are compatible with the manufacturers circuit control boards in the furnace. Hunter has had this problem several years ago. Other than that you may have miss wired the unit. usually the furnace is used as backup heat (during defrost) or emergency heat if your heat pump konks out. Are you switching to emergency heat for a furnace call?

Nov 24, 2009 | Hunter Fan Company 5/1/1 Programmable...

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Honeywell Thermostat power light


I just had this happen to me a few days ago. I hope you find this response before you did what I did and paid an AC guy $103 for him to do about 5 minutes worth of work. Here goes.

The power is shutting off because your drip line is clogged. Your drip line is the tubing that goes from your compressor (inside) to the outside of your house. When that tube gets clogged up (with algae and dirt) then the water will backup in the line. There is a protection circuit in the line and when it detects water (because of a backup) then it shuts all power to the AC off. If you take a shop vac outside and **** all the **** out then you'll be fine. The AC guy said that when I replace my filter every month that I need to pour about 1/2 cup of bleach in the line (from the inside) to prevent algae from forming and stopping the pipe up. Hope this helps someone out there before it costs them a $100.

May 18, 2009 | Honeywell Programmable Thermostat Heater

1 Answer

No heat new thermostat


you have a short in the wireing.disconnect at air handler and hook-up short t-stat wire to t-stat,ifok chk wire to condenser

Jan 10, 2009 | Heating & Cooling

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