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An Alpine ALP080 furnace keeps locking out with a fault 27 code. Hired a plumber to service (thankfully only charged for cleaning) didn't find anything wrong and they only thing he knew about the fault code was what it said in my manual. The fault says possible sage control. I noticed 2 part numbers one for the transformer and the other for the control itself (hard to find). Wondering if this is a DIY fix or if I should call back the plumber.