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I have a lennox merit series furnace (12 years old) and the

Customer Question
fan will not run in...
I have a lennox merit series furnace (12 years old) and the fan will not run in on position or auto, and furnace will not run. It all ran well with AC this past summer. I cleaned the flame sensor yesterday before trying the furnace. Any ideas where to start troubleshooting?
Submitted: 2 years ago.Category: HVAC
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Answered in 5 minutes by:
10/31/2015
HVAC Technician: airheatman, HVAC Technician replied 2 years ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8,772
Experience: Furnace, A/C and heat pump specialist.
Verified

Will anything at all work right now? AC or anything?And what type thermostat do you have ,digital or mechanical?

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Customer reply replied 2 years ago
No. I think it's a mechanical thermostat. I came with the unit and the house 12.5 years ago.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Troubleshooting often requires meters and test equipment.Do you have a multi meter for testing voltage? If not you can get an inexpensive one at Walmart for about 15 bucks, if you have or would like to obtain a meter to troubleshoot , I will be happy to guide you.Without a meter , there are a limited number of things we can check if you are able to do a visual inspection and can do some hands on troubleshooting.Please let me know and we can go from here.

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Customer reply replied 2 years ago
I do have a harbor freight tester. And I would be willing to try any types of testing or inspecting
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Your furnace has a control board located in the blower compartment that will help us in troubleshooting. Look and see if there is a little window to look through on bottom panel and see what light is doing. Here is a chart.I will guide you from here.

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Customer reply replied 2 years ago
No light in window, I checked already
Customer reply replied 2 years ago
Are you still there. There is no light red or green?
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

OK if no light is on at all we are not getting power to the furnace control board. Lets remove that panel and check power coming in.

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Customer reply replied 2 years ago
OK, panel is removed
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Are you fAMILIAR WITH A TRANSFORMER , WHAT IT LOOKS LIKE?

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Customer reply replied 2 years ago
Not real sure, but I'm willing to learn:)
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

OH here is the transformer. It will have 2 wires coming in to LINE and two wires leaving from LOAD.

We want to verify 120v into line and 24v out of load

http://www.repairclinic.com/PartDetail/b367p36/Lennox-Furnace-Transformer/17W56/2345689?modelNumber=G40UH-36A-070-5&ss=a36b367d1238076&mr=1

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HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Keep in mind door switch will need to be held ot taped in to get power to furnace

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Customer reply replied 2 years ago
Going to try phone, it's easier than running up and down the stairs.
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

Thanks for letting me work wit you.Feel free to follow up for 30 days at no additional cost. Bonus always appreciated if you feel justified

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Customer reply replied 2 years ago
Fuse blown. Thanks for the help!!! A+++++
HVAC Technician: airheatman, HVAC Technician replied 2 years ago

If my answer has been polite, professional,and thorough, please click one of the ratings before you go. If you still need help let me know!.Expert is not paid for assisting you until you rate answer

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airheatman
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8,772
8,772 Satisfied Customers
Experience: Furnace, A/C and heat pump specialist.

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