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Munchkin 926 upgrade gives F13 error
Hello...I am a reasonably handy homeowner with a Munchkin T80M installed in 2004. It has been having trouble detecting flame (F10 error) at random intervals, including when we are out of town, which is a huge problem. I learned that an upgrade to a 926 board would improve the flame sensing reliability by increasing the sensing voltage and using the spark rod as an alternate sensor.
I bought the 926 upgrade board (Munchkin 7250P-731 Control/Display Replacement for 925 Controller) by mail from a supplier to remain nameless. This board is supposed to be programmed for the model of boiler it will go into.
Installation was trivial, but the board gives me an F13 error (fan speed too low). I put the old board back, and it is running without any problem.
Unfortunately the supplier was not helpful...they insist that I must have a fan problem, that I could have damaged the new board, etc., etc.---basically, customer is always wrong. I also wrote to HTP, because they had been very helpful to me with tech support when the boiler was first installed. Unfortunately, they responded telling me that I should hire a contractor.
Back in 2004-06, heatinghelp.com (which had a different layout then) was also a great source of information and advice! I have not been back for some years. My question is, what would cause the F13 error with the new board but not the old one? Could the board have been programmed by mistake for a different model with a different fan? (The supplier denies it.) Is there any other possibility and anything to check?
Thank you very much,