honeywell st9120u wiring diagram

Minggu, 26 Desember 2021 Edit

Tried two different ST9120U boards could not get it to work. First tech came out and diagnosed that it needed a new circuit board So I said OK do the work.

Resideo St9120u Universal Electronic Fan Timers Installation Guide Manuals

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. Next tech brought a new Honeywell S8610U ignition control and a new Honeywell ST9120U universal board to replace the ST9120B 1005 board. This year just clicking cycling and no ignition.

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