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Member Post posted an update
May 26, 2026 (edited)
York YT main control board issues
I’ve got a york YT with the codepak microcomputer controls, we had the micro board go bad, had it rebuilt and installed a new time clock chip. Now it attempts to start without a call or turning on the oil pump. Anyone have this issue before?
Member Post, Member Post and 2 others5 Comments-
is it the BRAM Chip? Sounds like its locked in Diagnostic mode where you can check outputs like relays solenoids etc. in this mode the logic hi comes on for the Starter and attempts to start the motor but no oil pump is on you only do this to check outputs so motor should be disconnected for diag test. sounds like in logic its turned on its either I or O. I will see if I have the service manual for this vintage
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Apologies first book was a K machine not a T
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@brian-medley I appreciate it, I’ll be reading through that tonight to find an answer.
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