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Furnace kicks on but wont fire up. blinking light code indicates pressure sensor error. checked outside pipes. air coming out of one. see no visible blockages in intake

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Hello, check the small hose going from the inducer to pressure switch, make sure it is not loose, kinked or have water in it, if this checks out good then the switch itself is bad and must be replaced.

Posted on Mar 27, 2011

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Furnace will not light


Most furnaces can be reset by turning the power off and back on.
The pressure switch senses pressures in the furnace to make sure the exhaust fan or draft inducer is operating properly. if not the furnace shuts down. check the inlet and exhaust terminals outside for obstructions (I.E: leaves,frost or snow) check the drains to make sure they are not clogged . Hope this helps.

Dec 30, 2013 | Heating & Cooling

1 Answer

Goodman gmp0503 unit has status light blinking slowly all the time. The indoor blower wont even come on when you switch from auto to fan on thermastat. The status light says for one blink to check gas...


Take a jumper wire and jump out the R and W terminals on the furnace. The heat should come on. If it does not, you have a bad board. A steady blink indicates no call for heat. You may have either a broken thermostat wire or a bad thermostat if unit fires when you jump it.

Mar 20, 2011 | Goodman Heating & Cooling

1 Answer

The blowers are turning on but there's no fire, what could this be?


If the room air blower is blowing air but not warm, it is an indication that there is a problem with the unit and an error code is blinking on the board. To view the code, look thru a small viewing port in the lower panel. Count the blinks and then find the panel that has the wiring diagram glued to it. On the diagram you will find a diagnostic chart to correspond with the number of blinks.

This may also help:
On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Jan 17, 2010 | Goodman GMS90703BXA Heater

1 Answer

My central heat is not heating It still blows


If the room air blower runs but the heat is not working, this is an indication that the heater has stored an error code. Your furnace has a diagnostic light that will blink a code. You should be able to view the LED thru a small viewing port in one of the front panels. If you have to remove a panel to get to it, it may erase the error code. If it does, tape down the door safety switch and cycle the furnace with the panel off. Once you get the error code, look on the wiring diagram for a diagnostic code chart. It may give you a starting point to help you. I am also including some other tips that may help.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

Dec 30, 2009 | Coleman Propane Forced Air Heater...

1 Answer

Furnace kicks off and right back on


If this is a newer furnace, an indication of an error is that the room air blower stays on. Get in front of the furnace and see if you can see any blinking lights. Try not to remove any panels as you will erase any error codes. There should ba a small viewing port that you can look through. Once you count the blinks, look at the wiring diagram for the error code chart. It may give you a starting point. Can you tell us a make and model number of the system?

Dec 29, 2009 | Heating & Cooling

1 Answer

Three blinks on gas furnace, will not maintain flame


3 blinks indicates a pressure switch error. Check or replace air filter, condensate hoses for blockage, check small hose uo to pressure switch(s), check the vent pipes to make sure they pitch back to the furnace, check the air intake and exhaust pipes for any blockage outside. If all looks good, jump out pressure switch as soon as the exhaust fan starts to turn and see if unit starts. If it does, replace pressure switch.

Dec 01, 2009 | Goodman Heating & Cooling

4 Answers

York 92 % eff. furnace shuts down on # 3 error (pressure switch)


i have fixed almost every one of pc9 -----we have installed in our company,code three{flashes} at first new presure switches installed, same thing,york knows about this,induction motor bearings,could be bad.our local york dist, has boards,inducer, ***.motor, dual press.switch,free.as is known as the only way to fix.after all else is ruled out.one local competator called us if we wanted to join class action suit . good luck.furnaces work good at first, season or two then bam

Nov 28, 2009 | York Furnace Draft Inducer Blower Fasco #...

1 Answer

Coleman furnace wont fire


Check inside the door panel next to the wiring schematic, you should find the diagnostic codes. Look up 7 blinks. This should narrow down the problem. ( It sounds like a bad hot surface ignitor).
Good luck.....

Mar 31, 2009 | Coleman Propane Forced Air Heater...

1 Answer

Goodman GMS90904CXA Wont ignite, light blinks 3 times


Ok, you either have a inducer fan issue or a pressure switch issue or a plugged vent pipe. The inducer turns on to establish a draft for the exhaust. If it is not working you will get this error code. If the pressure switch does not sense pressure caused by the inducer, it will give this code. If either the intake pipe or exhaust pipe is blocked (even y just a little) it will give you the same error code. If the condensate hose or receptical is plugged, again it will give you this error code. Good Luck!

Oct 20, 2008 | Goodman GMS90703BXA Heater

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