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Lennox G27M3-75A

mesotracker

By mesotracker
in DIY Appliance Repair Help

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mesotracker

mesotracker

Posted
Posted

This is my first post, thanks for having me aboard!

My problem was with a Lennox G27M3 75A 80% furnace. I forgot the age, and the serial number, but my problem arose when it came time to replace the boards. It has a blower control board, and the surelight control board, easy enough.

Since the furnace was built, both boards have been updated, and the updated board comes with a harness to connect to the other, old board. The problem arises when you need to order BOTH boards. The old wiring, obviously does not work, and neither of the update harness will allow you to connect up each board to each other. I called Lennox tech support, and their expert answer was as follows:

"at this time we do not make a harness to connect two new boards together, I guess you will just have to figure it out and do the best you can!" I kid you not...that is verbatum!!

I spent 8 hours rewiring,splicing and taping and finally got it all working. I was so close to condemning it due to parts no longer available.

Ive sent a letter to lennox, in addition to the phone call, and I advise all other techs who come across this to do the same. If they want us to fix their equipment, they must supply us with parts!!

thats my rant, and Im sticking to it!

  • 3 weeks later...
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niko851

niko851

Posted
Posted

Hey there -

Just curious - were you trying to find OEM only? I've ran into this numerous times and never had an issue getting a harness to match up. Maybe I have just been lucky :):). However, I do have MANY retro-fit harnesses taking up space if that tells you anything! Glad it did work out for you after the extensive work but check out some of the online wholesalers. This is generally where I obtain my stock, rarely OEM, and in case it's an ASAP item, they have a local brick & mortar.

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