Question about Heating & Cooling
I have it working walk away then it stops start all over again working on it i have taken the pressure switch out blew air in both directionsafter a few minutes you can hear the valve put it back together glow plug lite up the flame rolls out just washed out drain tube hope that works but any ideas as to what i can do to keep this from happening again and fixing the problem already have a week in this was and its cold here in upstate ny i live 1/4 of a mile from lake Ontario cant afford to replace again as i said year and half old
One tip is to inspect very carefully the actual barb connectors that the rubber hoses connect to on the pressure switches. They can become slightly restricted with oxidation or other particulate rendering them ineffective. HOWEVER, your comment that the flame "rolls out" has me concerned. Flame roll out is usually caused by a flu blockage. Many times, if the flue is not covered with a screen, small birds roost in them and hunker back farther and farther for warmth then die from carbon monoxide. If they die at or close to a fitting, they can fall down to the first elbow or 45 and create just enough blockage to effect the pressure switch, but not enough blockage for you to determine without cutting off the flu pipe and physically inspecting.
Another thing that causes flame roll out is a plugged p-trap in the condensing coil drain at the bottom of the blower assembly. It could cause flooding of the condensing coil which cause restriction of air flow through the system, resulting in tripping out on pressure switch.
You may have to cut the flu off in two places depending on how sophiticated you flue is. Usually its not too bad but you'll need pvc glue and primer and a couple pvc couplings to reinstall it. DO NOT operate the furnace with the flu disconnected.
If you find this as the cause, you may want to install a screen over the flu opening but use 1/4" mesh as too fine of screen (screen door) will create too much restriction and also effect the sensitive pressure switches.
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Posted on Jan 02, 2017
OK, if the furnace is not lighting for even a few seconds, you have either a bad gas valve, bad wire, bad control module or no gas. The pressure switch is not the issue. Check all wires to the gas valve and look for 24 volts across them when the ignitor glows and you hear the click. Then test for 24 volts to ground. It could be a bad ground wire.
Posted on Oct 21, 2008
SOURCE: My furnace stopped working.
Replace pressure switch. If you blow any air into the pressure switch it has been damaged,check air ports for debris by looking never ,never blow on air switch they work on a very small pressure or vaccum,where your breath is to much pressure and also loaded with unwanted humidity.
Posted on Mar 04, 2011
Replacing the board, flame sensor, and pressure switch, and cleaning out the induction motor was definitely a good start. Other things to check would be a blocked or restricted flue pipe, I have ran into a few bird nest before!, and you also want to check or replace the hose that runs from the inducer to the pressure switch if you haven't already. To be honest, most of the time I clear out the nipple on the inducer where the hose goes with a small piece of wire and it works. The last thing I would suggest is making sure the new pressure switch is rated for what you need. Alot of the revisions on furnaces actually call for less than the original pressure just for this problem. Hope this helps and good luck!
Posted on Jul 03, 2011
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