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How to wire my fan limit switch? - Honeywell Heating & Cooling

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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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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 Heating & Cooling

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 | Heating & Cooling

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

1 Answer

Blower fan running constant after new fan and limit switch installed.more info.Honeywell-tradeline.L4064B 2210, combination fan and limit control, adjustable fan differential with manual fan switch, flush...


Here's my best shot.
Check the temperature settings for the fan switch.
The low OFF setting should be about 100 degrees.
The ON setting should be around 150 degrees and this is the setting that "makes" the ON contacts.
The HIGH LIMIT setting should be about 180 degrees.
If these are set, can you use a meter to see if the FAN ON contacts are closed?
Lastly, it appears that one hot line should go to one side of the blower and the other hot line should go to the bottom FAN terminal with the other side of the blower being fed by wiring from the top FAN terminal.
Good Luck. Gary

Feb 21, 2011 | Honeywell Heating & Cooling

1 Answer

I have a paragon 8145-20 defrost timer. do you wire the compressor to the timer? I cant seem to find a wiring diagram on how to wire this correctly


Link below has wiring diagrams and wiring manuals for 240V 8145-20
http://waterheatertimer.org/Paragon-timers-and-manuals.html#defrost

I am not expert installing defrost timers.
According to information from Paragon, 8145 is for hot gas defrosting. 8140 series are time initiated, and pressure-or-temperature terminated.
Wiring diagram does not show compressor wired to timer.

The cycle works like this:
Timer is running but defrost is not switched ON.
Fan is ON.
Timer switches ON and activates defrost cycle.
Fan turns OFF. Hot gas valve turns ON for defrosting.
Cycle limit switch is temperature or pressure sensitive.
Cycle limit switch reaches trip point, timer switches OFF.
Hot gas valve turns OFF. Fan turns ON.
So fan is off during defrost cycle.
Hot gas valve turns ON when timer switches ON.
Timer is switched OFF by pressure-or-temperature limit switch.

Dec 09, 2010 | Paragon 8145-20 Defrost Timer

1 Answer

How to properly install plenum limit switch


If this is the old style limit/fan switch. Turn power off
remove the wires and label where they got disconnected from and wire the new one in. Make note of the settings on the old limit switch so you can
adjust the new one. The limit switches come in
different lengths so get the right one.

If it is a flat bimetal disc, then I think you have only to
wires that have to be connected so hook up same
to wires from the old one. With Bimetal disc fan
limits you need to make sure you get the same
temperature reading as the old one

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I have a goodman GMP 125-5 furnace. I have


sounds like the primary limit typically behind the gas valve its larger then the others, rectangle in shape with 2 wires going to it. be careful if your bypassing limit this can create a very hazardous condition

Nov 06, 2009 | Goodman GDS80904BNA Open Flame Heater

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

4 Answers

Hunter Fan # 20723 The Westminster - lights delayed when turn on


Here is the answer I received from Hunter Technical Support.

"The light fixtures are manufactured with a limiter that prevents a higher than recommended wattage bulb from working. The limiter causes the slight delay even when the correct bulbs are is in use."

Pretty annoying if you ask me.

Jan 25, 2009 | Hunter 28096 Westminster 52" Ceiling Fan...

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