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Give me a few more details as to what is happening and how you have diagnosed issue to be with board.
Let me ask you this. When blower runs but fails to provide heat, do you get an error code on the board ?
Turning power off and back on resets any error codes until the issue happens again. For example if the pressure switch opened prematurely we would get 2 blinks followed by 4 blinks on the led on board
Ok when power is on to furnace but no call for heat we should have a 1/4 second flash followed by 4 seconds off.
On call for heat, the lights should be a constant 1/2 second bright followed by 1/2 second dim the entire heat cycle unless something fails. If it fails we should get a code determined by blinking lights.
If we are getting no lights when it fails and if it does not reset immediately upon restoring power , the it definitely seems board is failing.
Is this something you are wanting to find online and replace yourself or are just verifying the diagnosis? If you are wanting to replace yourself, look on board for a number like 63W57 or similar and I will assist you in locating.
Can you provide the rest of the numbers in model after the G61MP?
Take a look at this board and see if has all the terminals yours has.I a showing available from AC Parts direct:
I am showing OEM part was 86W81.
All parts also has it listed.Click this link and scroll down .You will find it listed by part you gave me on left side of page
I have not heard of the website either,I think I would trust one of the ebay sellers with high feedback before a surplus site.Didyou look at some on Ebay yet?
Check these out and let me know if they match your board.
It appears the old board has been discontinued. Even from the Lennox parts store (which I don't usually recommend due to pricing), is showing the board has been replaced with that upgrade kit.The only way you may find the old board would be to find a used one on an old unit somewhere.
Thermostat would not make the lights go off on board..If thermostat were failing to send signal, the lights would go back to the pulse (no call for heat).
You might check power wires and ground to be sure they are secure. Erratic behavior is common for a failing board.