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My Lennox furnace nor Aircondition could not start

  • Last Updated:
  • Oct 5th, 2020 11:28 am
Banned
May 22, 2019
1469 posts
2121 upvotes

My Lennox furnace nor Aircondition could not start

My thermostat turns to heat, furnace not starting regardless what temperature I set; when I turn it to cool, no matter what temperature I set, it does not start.

I can hear low pitch sound from the furnace box, no reading is shown.

Is it due to my blower problem? Or my thermostat could not control the furnace?

Any clue how I can further diagnose the problem?
DC2FFBA6-5F2E-4550-9E1C-CAB59BFBEF67.jpeg
512C4958-830C-4608-93C6-9C586459D453.jpeg
World cup is coming
5 replies
Sr. Member
Jan 19, 2013
708 posts
626 upvotes
Ottawa
See if the control board is throwing an diagnostic code??
Also looks like right side drain plug is leaking
Probably a low voltage fuse tripped or bad thermostat if both heat/cool arent working
Deal Addict
Jun 16, 2009
4517 posts
3449 upvotes
Vaughan
Check to see if there is any lights flickering from the glass eye piece at the bottom of furnace. If you see no lights at all, it could be your furnace main switch OFF or your breakers might have tripped.
ilovetoyota wrote: My thermostat turns to heat, furnace not starting regardless what temperature I set; when I turn it to cool, no matter what temperature I set, it does not start.

I can hear low pitch sound from the furnace box, no reading is shown.

Is it due to my blower problem? Or my thermostat could not control the furnace?

Any clue how I can further diagnose the problem?DC2FFBA6-5F2E-4550-9E1C-CAB59BFBEF67.jpeg

512C4958-830C-4608-93C6-9C586459D453.jpeg
Certified HVAC Pro. Committed to Customer, not brand. Past RFD Review
2024 AC, Furnace, Heat Pump and Water Heater Groupbuy
Member
May 12, 2003
371 posts
262 upvotes
GTA
OP, can you PM me the model number

I had a similar issue a few years ago. The culprit was a frozen coil, which would melt water on top of the furnace, and it shorted my board.

Had to replace the board.

I have an extra if that's what your issue is. PM me. My Model was EL296UH090XV36C
Last edited by ssj4_ootaku1 on Oct 5th, 2020 10:47 am, edited 1 time in total.
Deal Addict
Dec 4, 2011
2565 posts
2828 upvotes
Montréal
If you look through the eye piece you should see flashing characters, write them down and you can look at the chart on the cover to at least see if the problem is your furnace or thermostat
Deal Fanatic
May 5, 2008
6315 posts
3092 upvotes
Manitoba
Lennox are garbage 🗑

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