York Diamond 90 - Ignitor Tests Good But Does Not Light.


Old 09-22-14, 01:38 PM
Thread Starter
Join Date: Sep 2014
Location: USA
Posts: 1
Received 0 Votes on 0 Posts
York Diamond 90 - Ignitor Tests Good But Does Not Light.

The ignitor will not light. I tested it for continuity and if memory serves me it reads about 75 ohms.

An AC voltmeter connected to the plug coming from the PCB reads zero volts.

I hear relays click and motors run but no glow from the ignitor.

I had this problem the last 2 years. After sitting all summer I get the same problem. For some reason it seems to fix itself and start working.

Last year it started working when I disturbed the bundle of wires going to the PCB. And it worked properly all winter. That fix didn't work this year.

My gut feeling is that I have a bad relay contact. I don't want to buy a new PCB only to find out I have a bad sensor or something.

My questions are these: 1) Which relay supplies power to the ignitor? 2) What switches / sensors would prevent the ignitor relay from pulling?

Or better yet maybe this is a common problem and someone knows the exact fix.

And BTW I'm getting 4 flashes on the red LED

Sponsored Links
Old 09-23-14, 06:19 PM
Grady's Avatar
Forum Topic Moderator
Join Date: Jan 2005
Location: Delaware, The First State
Posts: 13,928
Received 0 Votes on 0 Posts
Somewhere on the furnace, usually on the inside of the blower compartment door, should be a key to the blink code. If you can find it, please tell us what the 4 blink code is. Sometimes the key is on the board itself.

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

Thread Tools
Search this Thread
Display Modes
Ask a Question
Question Title:
Your question will be posted in: