I have a york furnace model no G2FD024H17G it stopped blowing warm air, so I opened furnace and the error code is 4 red flashes, which indicates possible dirty air filter (among other things). The air filter was infact very dirty. how can I reset the furnace so it will start heating again.

https://fireplacehubs.com/york-furnace-red-light-blinking-7-times/

https://upgradedhome.com/york-furnace-red-light-is-blinking/

The "4" only indicates which program is currently running. This thermostat does not display furnace error codes.

In a heating system that uses hot wire ignition for natural gas or propane, this behavior may indicate the furnace failed to detect a flame when the cycle starts. You may get warm air briefly, but because the flame detector isn't working, the system shuts down. After a while, it purges any gas and tries again. The controller board in the furnace may have an indicator light that flashes an error code - look for a label on the access panel that describes what it means.

One common cause of this problem is a buildup of contaminants on the flame sense rod (often the same rod that heats red-hot to ignite the gas). Turn off the power to the furnace, wait for it to cool, then inspect the rod. If it has a whitish film on it, clean that off with Scotch-Brite (TM) or similar product (don't use sandpaper). The flame sensor works by measuring a tiny electrical current through the flame. A buildup of combustion products on the sensor blocks this current.

Warning: if you are not absolutely certain about which part is what in the furnace, don;t take any chances, call in a professional. This is a critical gas safety component.

Trane XV80 hard lockout, 2 flashes, Can't be reset - DoItYourself ...

www.doityourself.com > ... > Gas and Oil Home Heating Furnaces

Jan 10, 2013 - The only way I can get diagnostic Red LED light to reset is to switch ... a2 flash with absolutely no operation from the furnace does seem to ..... inducer gets a demand you should get a pressure switch error code 3. ... the flame sensor wire and giving the furnace a heating demand after resetting power twice. Luxaire Furnace Blowing Cold - 8 Red LED Flashes
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7 Tips and Tricks to repair your Furnace DIY - YouTube

? 13:25
https://www.youtube.com/watch?v=rAtcvPqUsBA
Dec 18, 2012 - Uploaded by JRESHOW .
cause this fault. 2 RED FLASHES: This indicates that thenormally open pressure ... The furnace will lock out for one hour and then restart. 7 RED FLASHES: This fault code indicates that the flame could not be established. This no-light ... problem. Bothheating and cooling operations will be affected. Check

Gas furnace fault or error codes for common furnaces - Gray ...

www.grayfurnaceman.com/-ifc-failure-codes.html
Here are error codes found on many York, Trane, Luxaire, Lennox, Carrier, ... If younotice 5 red colored flashes on your York Furnace, it signifies that your

Look at the back of the service panel to the unit. It should have the troubleshooting led codes on it.

Hi,
One of the limit switch in the furnace is tripped or went bad....
Try to find all of the reset switches and push the little red button on the top to reset them...
If that don't work you will need to take an electric meter and test each switch to see which one is bad...

heatman101

Remove the lower panel and look for a wiring diagram pasted to it. On that diagram there will be an error code diagnostic chart. Depending upon which model you have it could be an open overheat switch caused by a dirty filter or a bad fuse.

That blinking light may be the diagnostic light. Count the blinks next time it fails. Carrier units will have two different blinks depicting the error code such as one blink followed by a pause than 3 blinks giving you an error code of 13. Then look at the wiring diagram, it will have an error code chart telling you where to start with your diagnosis. You already know that if you remove the cover it erases the error code, so look thru the small window first.

has anyone worked on this furnace because the error would indicate that the positive 120 volt and the neg 120 volt is swapped , these units will also do this when the ground wire to the furnace or gas valve or furnace or @ the panel is lose , corroded , or missing , the gnd must be present to open valve , I am aware that ac is is not usually polarity sensitive but in this case it most certainly is ...have seen many time and know it to be true