Having an issue with "what I believe" is a YORK furnace in my home built by LANAR - mod# G8C 10020 MUD11A.
Problem is that the blower (recently replaced 2 months ago), is now running continuously. Following the blower replacement by a service tech, I believe the unit was operating normally... but now, neither the A/C or the Furnace will cut on. Pulled the cover panel off the unit in the attic (hence the model number), and there is a circuit board with a continuous blinking RED light. From what I can only guess based on troubleshooting info posted on the panel, this "could be" a "TWINNING ERROR - INCORRECT 24V PHASING".

This is beyond my expertise, and will likely have to call for outside help for repair. If anyone can confirm that the model number is a YORK, and/or could offer any advise for problem solving and/or part replacement, would sincerely appreciate your response.

Call a heating and pluming company I had the same problem and it was more than 1 thing wrong the circuit board was bad lights blinking and 2 of the valuves 1 on the furnuce and 1 on the outside unit were bad

Thanks for your response. Since posting my problem, I did flip the breaker off, since this was the only way to stop the blower from running. After about an hour or so, closed the breaker, and the furnace did kick in and started heating. Ran fine initially, but later (guessing within the next hour or so), noticed just air blowing from the ceiling registers - no more heat and blower still running.

As indicated in my original post, the continuously running blower is the same whether in cool or heat mode - the a/c will not cut on either, or if it does, will not cool for long (as with the furnace). Maybe it is just the board and could try and replace it---if I can find one.