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Trane XE90 - pressure switch error (with pic)
Hi, My Trane XE90, model TUC100C948B7 just threw me a code - Pressure Switch Error (3 flashes) last nite. I opened the panel and took this picture (attached) questions 1, What is B (a silver round thing), is this a pressure switch? 2, What is A (look like a motor) connects to the...