help to diagnose pilotless heater problem

jpplumber · 01-01-2007, 06:19 PM

i found what I think is the limit, a silver canister with 2 red wires attached coming from the blower moter...I hope that was it because i jumpped these two wires with no improvement,I see the vacuum hose and will inspect that.

#CARRIERMAN · 01-01-2007, 06:29 PM

Hi jpplumber

Wrong place, the piece I am talking about is mounted on the front of the flat plate almost dead center of the furnace. Give it another shot and I will check back in.

Rusty

jpplumber · 01-01-2007, 06:37 PM

the only 2 other red wires i noticed were on the diaphram switch with the vacuum hose coming off the inducer but i don't think you mean that either, i'll look again.

jpplumber · 01-01-2007, 06:46 PM

OK, I found the flat plate behind the gas valve and jumpped the wires,no improvement.

#CARRIERMAN · 01-01-2007, 07:58 PM

Hi jpplumber

Look around the burner area and see if there are some about dime size pieces with wires coming off of them. In the center of these will be a small button. Push in hard on this button and see if it snaps. If it does try the furnace again. I will check back in shortly

Good luck
Rusty

jpplumber · 01-01-2007, 08:38 PM

I really appriciate this. I pushed the buttons and turned it on, did not notice any clicks, turned it on and the moter came on as usual and shut down in about a minute instead of running on. I did make a discovery...I pulled the vacuum hose from both ends and tried blowing and sucking heard the vacuum switch click but could get no air throught the side attached to the inducer. I sucked on the hose to activate the switch again and turned the heater on and it fired up for about a minute, should I try jumping these two wires off the vacuum switch

trollmastergeneral · 01-01-2007, 09:00 PM

Quote:

Originally Posted by trollmastergeneral

Does the furnace light up at all or just inducer motor turns on.If only the ventor motor comes on then shut off power .Remove the small rubber hose attached to housing. Take a small pick and make sure the ventor hose conector is not pluged. Then put hose back on after inspecting it for holes.

I would shut off the the power and use a paper clip to check the vent conector where the rubber conects to the ventor motor for a blockage

jpplumber · 01-01-2007, 09:10 PM

I tried that already but with a heavier wire and it stopped when i assume it hit metal, I don't know how far the wire should go in or how easily debris is dislodged, but I tell you I can neither blow or suck on the fan side of the hose but the switch side clicks. I'll try a smaller wire.

#CARRIERMAN · 01-01-2007, 09:43 PM

Hi jpplumber

Like trollmaster suggested, see if the port is clear. If it is, start the furnace up. Once the inducer starts up for about 5 seconds, jumper the wires together on the pressure switch. If you do this too soon you will send it into an ignition lockout. If when you do this the furnace fires up and runs properly. You will need to replace pressure switch. But before you do it is crucial that you verify the pressure port is open on the inducer nipple. You should be able to put the hose on it and freely blow through.

Good luck
Rusty

trollmastergeneral · 01-01-2007, 09:48 PM

Quote:

Originally Posted by jpplumber

I tried that already but with a heavier wire and it stopped when i assume it hit metal, I don't know how far the wire should go in or how easily debris is dislodged, but I tell you I can neither blow or suck on the fan side of the hose but the switch side clicks. I'll try a smaller wire.

Well when that ventor motor turns on.It draws a vacuum on the presure switch so if that is pluged you may have to carefully drill it out if you cant use a wire to dislodge the block.

jpplumber · 01-01-2007, 09:52 PM

The port was blocked,

I guess I should have noted small pick, everything seams fine now. Thanks for your help, patience and the education.

trollmastergeneral · 01-01-2007, 10:08 PM

Thats what were here for.

letts have a round of aplause for carrierman and trollmaster

have a good day

#CARRIERMAN · 01-01-2007, 10:09 PM

Hi jpplumber

I would like to say Excellent. Trollmaster This is what I was talking about, this is why these people come here. Good job.

Rusty

acefurnacefixer · 01-01-2007, 10:48 PM

You got the furnace running alright, but did you correct the issue? P.S. I hope you dident leave the silver cannister thingy

jumpered out(oh boy).

jpplumber · 01-02-2007, 09:03 AM

No I did not leave the other wires jumpped, I put them back after I tried the first time. I assume the issue is resolved unless I want to clean the inside of the inducer housing covered with crud I assume...but I also have plenty of paper clips

to clean the vacuum tube connector. Could this plugged tube also affect the AC or is this inducer fan only for the heater? In Texas we rely on our AC far more than the heater. Thanks again.