Question about Coleman Propane Forced Air Heater w/Electronic Ignition (50,000-80,000 BTU)

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The furnace states pressure switch did not close. How do I find pressure switch?

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Paul Carew

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1 Answer

Furnace will not light

If the inducer runs for a short time and shuts off and the main blower comes on and runs it could be a high limit switch or a roll out could also be a pressure switch that is stuck in the closed position. Most new furnaces have to read the pressure switch in the open position and then the closed position after the inducer fan starts. . Hope this helps.

Dec 17, 2013 | Heating & Cooling

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My dukane furnace flashes three lights on the internal circuit board inside the base unit. The error indicates a pressure switch issue. If i pull the tube leading to the unit and blow into it, the u

Most pressure switches run off of a vacuum not pressure, when the inducer starts it actually creates a negative pressure that closes the switch, most boards require the switch to be open on initiation then after the inducer starts it must close, you could **** on the tube and see if you hear it click, or test with a meter for continuity. Draft problems can cause carbon monoxide and kill so do not attempt to jump out a pressure switch or any other control other than for testing purposes. I hope this helps and if it does give me a thumbs up

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Carrier Furnace won't start up

Sequence of events: call for heat at T-stat, inducer motor turns on, negative pressure created in heat exchanger closes pressure switch, pressure switch control wire runs through all safety's (these must all be in closed/safe position) if ok then glow plug lights. Time delay then gas valve opens, flame verified by "flame rod" t-stat = :)

Apr 22, 2013 | Heating & Cooling

1 Answer

Our furnace wont blow heat. status code is 1 short dash 4 long dashes.. please help!!!!

Hello, this code means that the pressure switch is closed and wont allow the furnace to run. Sometimes the contacts on the pressure switch weld closed or the switch itself will go bad and must be replaced.

Jan 27, 2011 | Heating & Cooling

1 Answer

I have a stuck closed pressure switch error, the furnace continues to try and light but can't. Is there a way to fix this without a new pressure switch?

Not sure what you have for furnace so I can only offer generic info. Take a jumper wire with alligator clips on each end. Hook one end of jumper to pressure switch terminal but keep original wires on it as well. You will have to slide the original wire back enough to clip on the jumper. Slide the second wire back as well but do not connect the jumper yet. Tape the door safety switch closed if you have to to be able to have the furnace run. As the inducer or exhaust fan spins up to speed, take the unused end of the jumper and hook to the second terminal of the pressure switch. This will fool the circuit board and the igniter should start to glow or spark. If this works, look for any blockage of the air intake pipe, the exhaust pipe, water or ice in any of the hoses, dirty air filter or restriction of the inducer fan. Even a small leaf can collect moisture and grow in size as it ices up restricting the vacuum. As the furnace runs, check the hoses going to the pressure switch to see how much vacuum is being produced by the inducer. This is what closes the switch. If you apply a small amount of vacuum to the pressure switch, you should be able to feel and hear the switch close. If not, replace the pressure switch.

Hope this is some help. Please rate my answer!

Jan 23, 2011 | Heating & Cooling

1 Answer

PSE+G stated the problem was diagnosed as a pressure swith on my Goodman heater....any suggestions to fix? Is this an expensive job?

How do you test a pressure switch and other limit controls? This is for people who are experienced with electrical equipment and the use of a Volt Ohm meter. *Please never by pass a pressure switch or limit control. The pressure switch and limit switches are there for your safety. If you have an open limit control either the furnace has over heated or the limit has gone bad. Problems that would make a limit open up would be dirty filters, dirty evaporator coil causing a restriction in the air flow or a slow blower motor (check the capacitor on the blower motor to make sure it is good). A weak blower motor capacitor will cause the blower to run slow and eventually fail. Pressure switches, and limit switches can be tested with a meter in the same manner. With the furnace calling for heat you can test each of the terminals on the pressure switch to ground to make sure the pressure switch is closed. You should be getting between 24 to 28 volts from each terminal to ground if the pressure switch is closed. If the pressure switch is open you either have a stopped up vent, drain line (if you have a condensing furnace) or bad pressure switch. Please keep in mind there are many different types. The front terminal is burnt and discolored. This is a clue that this pressure switch has a problem.

Dec 22, 2010 | Goodman GMS90703BXA Heater

2 Answers

Hello. I have a Goodman furnace model no. GDS80453AMA. The furnace indicator light is blinking 3 times, which according to the schematic, is "pressure switch stuck open". Previously I've had the furnace...

The pressure switch requires a negative pressure (vacuum) to close the contacts. It is measuring the pressure in the inducer and indirectly ensure there is good combustion airflow throught the heat exchanger. Check for a small vacuum, in the neighborhood of 1" water column. Usually the vacuum required to close the switch is stamped on the vacuum switch. Check the vent pipe for obstructions and correct size and installation.
If the pressure aka vacuum switch does not close the furnace will not continue with ignition, for safety reasons.

Oct 18, 2010 | Goodman GMS80453ANA Open Flame Mid-Size...

1 Answer

Get error code #4 & furnace won't start up

A pressure switch is a safety, which in this case is being used to verify that your furnace is drafting properly. Yours in particular is sticking in the closed position even after the call for heat is satisfied. The control board checks to make sure the switch is open the next time there is a call for heat, and when it sees that the pressure switch is already closed even before the draft inducer motor comes on, it knows there is a problem....hence the error code. When you are rapping on the furnace, it is causing the contacts to open, eventhough you're not tapping on the pressure switch itself. Usually you will see a rubber hose attached to the pressure switch and 2 or three wires depending on what type of switch it is.

I hope this helps!

Oct 14, 2009 | Heating & Cooling

1 Answer

Pressure switch

Hi AB, I am mr.grzz,
thanks for your questions, well first off there is no fixing the pressure switch, it will have to be replaced, you will need your model and serial number on the furnace, make of furnace, to order a new one from a parts supplier, fairly easy to replace.first make sure the power is off to the furnace, undo the two wire leads on it, then the two screws holding it in place, remove the one or two small hoses attached to it, if you remove it before you go to look for a part, that would be best, there is a rating on it, just follow these steps in reverse to put in place, hope that helped ya, thanks again, mr.grzz

Jan 16, 2009 | Honeywell HE260A1010 Whole House...

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