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How to wire my fan limit switch? - Honeywell Air Conditioners

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Do you have a brand name and part number of the fan switch?

Posted on Oct 21, 2008

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How do I wire a induce fan motor


Induced fan motors on older units are wired through the high limit safety on the stack - in series. When the furnace calls for heat, the induced fan motor comes on and after a time the furnace will light.

Older units have a temp switch in the stack that rotates to bring on the burners and blower motor. . When there is a call for heat, the induced draft fan motor comes on and then the burners will light.

After the heat exchanger is warmed up the limit switch will bring the blower motor on. That's basically how it works - there are two circuits - one for the induced draft motor and the burners and the other for the blower and high limit.

New units have a plug on the board you just plug in.

A

Oct 04, 2014 | Air Conditioners

2 Answers

Furnace keeps tripping off on limit switch. replaced limit switch still trips, blower motor seems to work fine.


It's always possible that the limit "dial" switch is sticking leading you to believe that it's only at 150º.

How old is the furnace and when was it last cleaned.

Dec 12, 2007 | Air Conditioners

1 Answer

Where is the flame sensor on Intertherm MGHA-070abfc-01?


There is no flame sensor per se, unless it has an ignition type pilot. Only temperature activated switches employed.

The limit switch to the left of fan switch is "Nordyne" part #626259. This switch is rated at140 degrees. When the temperature inside firebox exceeds 140 degrees, switch "opens" removing power from the secondary of 24vac xfmr.

The fan switch to the right of the limit switch is "Nordyne" part #626337. This switch closes when firebox temp reaches 115 degrees. Opens at 70 degrees.

At the top to the left of fan is a smaller limit switch, which is a secondary safety switch. The increased temperature within the heat exchanger box activates this switch. It is wired in series with the thermostat wiring.

Hope this info helps.

Feb 05, 2013 | Intertherm Air Conditioners

1 Answer

Goodman gas pack unit indoor fan stays on all the time


Problem may be with the high limit switch located above the burner assembly with two wires to flat rectangular looking plate. Jumper the two wires and see if the fan quit's running. If so replace high limit switch.

Aug 22, 2011 | Goodman CKL36AR36 Air Conditioner

2 Answers

Intertherm MGH-056ABFC-91 won't kick on. Just changed thermocouple, gas valve, and thermostat this week. Changed fan motor, blower wheel, and limit switch last winter. Pilot is lit, thermostat is set. The...


At the furnace, jump the R and W (or T and T) terminals on the circuit board or gas valve. Make sure the door switch is closed with some electrical tape. By doing this we are forcing the unit to start. If it does fire, you have either a bad thermostat or a broken wire to the thermostat. If it does nothing, look for a bad fuse, check for 24 volts going to the gas valve, an open limit switch or 120 volts at the transformer.

Nov 02, 2009 | Intertherm P3RA-048K Air Conditioner

2 Answers

When I switch the T-stat to (fan on) the blower won't come on unless I move the Fan limit up close to the 100 degree mark and then I move that limit back down close to 130-135 degree and after approx. 10...


That fan switch is for the heating mode,when the burner starts, that switch won't allow the blower to come on until the combustion chamber is warm, so you won't have cold air blowing out of the ducts in the winter. It's usually set at about 120°. If your getting 24 volts to the blower relay for cooling and the blower doesn't come on then check across
the relay points for the blower and if you have
120 volts and the blower isn't running then that relay is bad and needs replaced.

Aug 13, 2009 | Air Conditioners

2 Answers

When I set tstat to call for a/c, compressor outside comes on. Blower on furnace does not. When I manually rotate fan limit switch on furnace wall, blower comes on, blows cold air, and then goes off when...


blower relay bad or no call from stat on green wire to run fan jump red on stat to green if fan comes on stat bad if no look for fan relay turning the well switch bypasses the relay hope this helps

May 24, 2009 | Air Conditioners

2 Answers

Rudd Achiever Plus - Fan runs 24/7


Sounds like one of the limit switches are stuck closed. There are two types, manual and auto reset. The limit switches are about the size of a dime and have 2 wires connected to them. The manual reset switches have a small red button between the wires. Press the buttons and make sure you find all of them. They can be rather obscure. There is also a larger limit located on the bonnet wall. It's the main limit. You need to remove the wires and do a continuity check to see if it's bad. Gas furnaces are pretty simple and with a meter, you will be able to find the one that is bad. They are not that expensive so if you don't want to check them all, you can replace all of them. You can check them too by using a small piece of wire, called a jumper wire. Remove the two wires from the limit and use your "jumper" wire to tie them together. Do this one at a time turning the unit off and back on each time.

Mar 18, 2009 | Ruud UBHC Air Conditioner

1 Answer

Two and a half ton Goodman Package Unit


goodman boards really have to have a very good ground. make sure the ground wire is securely attached. also even though you say the limits are all good, you need to check the wiring that goes from one limit to the next. they should make a loop that goes from the plug at the control board to each limit and then back to the plug. take the plug loose and locate these 2 wires. ohm them out. if it is open, your problem is somewhere in the loop. the fact that the blower is running all the time tells me the board is not getting the signal it is looking for from the limits. I have seen some goodmans that have a rollout problem at the burner box and it melted the wiring to the limits on top of the box.it is hard to see so you have to look closely. also if this is the case, you need to have someone check the heat exchanger for a crack. the rollout usually does not happen till the fan starts blowing while the burners are on. if this is the case, you do not want to run the furnace for any reason as this is a carbon monoxide risk.

Jan 27, 2009 | Goodman CLQ36AR49 Air Conditioner

1 Answer

My fan limit switch will not shut the fan off in heating (gas). The dial on the limit switch rotates till the shut off point then sticks. I have to turn it manually to shut it off.


Make sure nothing is bent and causing added pressure to keep it sticking.

You will likely need to replace the limit switch.

I don't know your model, but its probably 2 wires, 2 or 4 screws and runs about 20 to 40 bucks for the part.
Turn the power off first.

Dec 06, 2008 | Air Conditioners

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