Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Search this Thread Display Modes
Old 11-15-2007, 11:23 PM   #1
Newbie
 
Join Date: Nov 2007
Posts: 11
Share |
Default

Heil ignition problems


I have a Heil furnace circa 1990 with an electronic intermittent pilot. when the furnace tries to kick on the ignition module fires and the pilot briefly lights for a split second. then all goes dead.

I've checked for voltage at the gas valve and have 24 volts on the two hot wires - one is only hot during spark off (or is it spark on, can't remember). the other on stays live when I unplug it, and there's a constant humming sound until i plug it back in.

anyway, it's as if the pilot gets a short shot of gas, then goes out. then the thing tries to fire again a couple seconds later, and just keeps repeating.

I don't see a thermocouple/flame sensor. but there must be one, right?

not sure what to do next.

sky jumper is offline   Reply With Quote
Old 11-16-2007, 12:30 PM   #2
Newbie
 
Join Date: Nov 2007
Posts: 11
Default

Heil ignition problems


ok, after further research & troubleshooting I've found the following:

the gas valve (honeywell 8204) appears to have bad valve coils. I ohmed them and got infinite resistance. the identical set up for the 1st floor shows about 20ohm for both the PV and MV coils.

strange thing - the pilot does briefly light. and I've verified that there is definitely a shot of gas coming out of the pilot line (smell test) - not much, and it quickly dissipates, but it's there. and yet the coil appears to be blown. how's the gas getting out??

anyway, I feel confident the gas valve needs to be replaced. any tips on how to do this??

sky jumper is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Drywall problems in new house BettyCv Building & Construction 39 05-28-2010 01:51 PM
This may help someone with carrier ignition problems AweMan HVAC 15 02-09-2009 01:20 PM
Are you having ice problems? Grumpy Roofing/Siding 27 02-17-2008 03:51 PM
my ac keeps blowing boards on my heil furnace sally HVAC 2 07-23-2005 07:14 PM




Top of Page | View New Posts

Copyright © 2003-2014 Escalate Media. All Rights Reserved.