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I have an analog 3107541.009 kit. I havee replaced the board on the furnace and installed a new thermostat. The furnace wontt start unless I move the temp control manually.

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 230 Answers

SOURCE: will not shut off

Sounds like a stuck relay on the unit itself. Maybe there is a short in the control wire that comes from the thermostat that activates the fan.

The thermostat probably has one hot wire at all times. The thermostat then chooses which wire to send the voltage down based on your selection. One of those wires is probably for the fan only. Make sure that it is in good condition (no bare, pinched or wires)

Posted on Jun 17, 2008

motor1258
  • 6674 Answers

SOURCE: dometic air & analog thermostat control kit

Had one doing similar recently, and after a thunder & lightning storm. Nothing worked, but kept blowing 2 amp fuse in thermostat, when anything tried, heat or cool. Pulled plastic control box down from inside upper unit (AC) made sure breaker was off, took of plastic cover and smelled inside, and could smell burnt plastic smell. Replaced, control box, that got fan only working. Tried another thermostat , everything worked as it should. Turns out the lightning, or power surge, or whatever, shorted out the thermostat, and control box at same time.

Posted on Aug 14, 2008

motor1258
  • 6674 Answers

SOURCE: analog thermo.stat control kit

Have you tried removing the RH wire connected to the thermostat and try it ? This might rule out furnace as short in system. If it does the same, put RH- (heat) back on and try removing RC-(cool) , if it doesn't pop the fuse, you may have isolated the problem.?

Posted on Aug 23, 2008

  • 1 Answer

SOURCE: Blower fan runs continually.

your sensor to the fan is stuck in the closed position. This sensor kicks the fan on when a certain temp is reached in the heat chamber. It opens after cool down and apparently is stuck closed.

Posted on Jan 23, 2009

  • 56 Answers

SOURCE: Carrier Weathermaker 8000 turns off intermittently

You can find what the error code is by looking on the inside of the bloewr panel. If it is still there after all these years there is a code list right around the wiring diagram. If my memory serves me correctly it is a limit problem. But be for sure and check the code sheet.

Posted on Feb 16, 2009

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Furnace keeps blowing fuse on the board that hosts low voltage wiring.. thats only when stat is operable. when stat is without batteries the fuse doesnt blow. furnace will try and run when i connect t


You may have multiple issues concerning the heat cycle, but the first that has to be resolved is the blowing fuse. The control circuit fuse blowing indicates a short somewhere in the low voltage wiring. IF the thermostat is newly installed, I would suggest first double checking ALL the low voltage wiring to make sure ALL the wires are connected correctly and to make sure the wire connected to the R terminal is not shorted to metal somewhere. If there is a C terminal, make sure R and C are not slightly bared and touching together.

Go to the furnace and note the location of the wires on the terminal strip. Remove them and install a TEMPORARY jumper across R and W. If the furnace comes on and begins the heat cycle without blowing the fuse, the problem is within the wiring or thermostat for sure. Remove the jumper and reinstall the wires. Go to the thermostat.

Remove the thermostat then take all the wires off of the sub base, taking note as to which wire went on which terminal. Take the R wire and the W wire and twist them together. The heater should come on indicating the problem is within the thermostat. Put the batteries in with a new fuse. If it blows, the sub base is the problem. If it doesn't blow, install the wire that goes to the R terminal. Check the fuse. Put the W wire on. Check the fuse. Put the G wire on. Check the fuse. Leave the thermostat on the chair, then turn the sub base 'fan on-auto' switch. Check the fuse. If its not blown by the time these three wires are installed, you inadvertently removed the 'short' by moving the wires around during this test. The remaining wires can be installed and the thermostat placed back on the sub base.

If you completed the above list and the fuse no longer blows and your furnace still only clicks, you obviously still have issues within the furnace of a mechanical nature. The clicking is the relays on the board initiating the combustion fan relay and attempting to initiate the pre-purge cycle. If the combustion fan hums and does not start, the fan could either be blocked (by a dead bird) or is mechanically shot and requires replacement. This fan HAS to start before the ignition process can begin. Solve that issue first after the blowing fuse issue is resolved. Its kinda rare that a system has so many issues at the same time. Usually when this is the case, someone replaced the thermostat and created that issue trying to resolve the underlying issue and the original cause for no heat.

This is NOT the professional way to troubleshoot it, but you are limited in your task without the proper analog or digital multimeter.

If you are unsure of your ability to systematically go through this process, abandon the idea and call a qualified service tech to bail you out.

Dec 31, 2014 | Heating & Cooling

1 Answer

We installed White Rodgers 1F81-261 thermostat and Bryant Plus 80T furnace about 2 yrs ago. They worked fine, until now. We tried to set the thermostat to 70F when the room is ~66F. The thermostat...


Does the display seem a little dim? If so replace the batteries. Anything else may be a furnace issue not the thermostat. Look at the furnace and see if you can view any error codes on the circuit board

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Honeywell programmable thermostat - was installed per instructions in manual and now the furnace runs non-stop unless I move switch to "off." The old (round mercury switch) thermostat was wired red t


If you are unsure about which wire goes where, that may be the source of your problem. The color coding can be confusing when changing from old to new. I pulled the instructions for my Honeywell CT3400A thermostat and found you can call Honeywell Consumer Services at 1-800-468-1502 M-F 7:30 am to 5 pm CT

Mar 11, 2013 | Heating & Cooling

1 Answer

Furnace shuts down before heat temp meets thermostat. Furnace unit starts frequently. Service installed new limit switch and a new circuit board but furnace unit continues to malfunction. Same problems...


has any one checked your thermostat. as soon as the furnace shuts down then turn up the stat and see if it starts right up. i would think the stat function should have been checked also.

Feb 12, 2011 | Heating & Cooling

1 Answer

Draft inducer runs continuously, unless i turn the furnace off at the fused switch on the furnace. Turning the Honeywell thermostat to the off position does nothing to stop it, nor does removing the front...


Sounds like some one needs a new induce draft fan relay, if relay is located on the main control board you have to replace control board,follow wires from inducer motor and you will find the relay. I could help you more if i knew model # and serial # of the furnace, Good luck.

Feb 06, 2010 | York Furnace Draft Inducer Blower Fasco #...

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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 | Heating & Cooling

2 Answers

I have a DuoTherm BriskAIr 13.5K BTU. The Dometic thermostat also controls my HydroFlame 8531-IV furnace. This morning, the furnace would not come on. I checked the wiring and there is no voltage at the...


If you look at control box at roof unit, they usually use a separate set of wires for furnace. See what colors they are attached to at harness to thermostat. Some just follow other harness, and come out at thermostat. (bypass control box) Once you've determined which 2 they are, join them together & see if furnace starts, as it should. If it does, thermostat is faulty. If not, pull outside cover off & check voltages at furnace. I'm guessing by furnace model that your unit is approx 30 ft , but if it's a park model, you may have 24 volt system on furnace or 12 volt. Another way of confirming is to go to back of furnace where air intake grille is inside your unit, and locate 2 blue wires going to furnace & remove whatever wires are attached to them & connect them together. Furnace should start up.

Jul 08, 2009 | Dometic Rooftop RV Air Conditioner

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Hint number 1, get HVAC license. One mistake or misunderstanding and you could blow your house up.

Feb 21, 2009 | Heating & Cooling

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sometimes there's a differential setting anywhere from 1-3 degrees, see if you can make sure it's down to 1

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Need to know which terminals run what


Had similar problem, continuous fan, turn off power, then won't start up. Replaced thermostat, no change. The main controller board in the furnace went bad. What was weird was that it happened in the summer, while the heat was turned off. One day I noticed that the fan was running. The thermostat was in the off position, and I had to shut off power to the furnace to make it stop. I forgot about it till heating season came along and it wouldn't start up. The preliminary blower would start, the gas would click on, it would light, then quit. After tracing and checking the various safety switches, etc. it became apparrent the main board was bad. I found one on ebay, replaced it, [a simple job, unplug, a few screws, replug] and it's been working fine..good luck, John

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