HoneywellFan + inducer timer for furnaces that already have a separate ignition module
ST9120U1011
Universal electronic fan timer (not an IFC)
Igniter
None — this board does not fire the burner
Motor
Heat/cool circulator plus combustion blower. PSC-class loads on the Resideo sheet.
Replace list
- All ST9101, ST9120, ST9141, and ST9160 electronic fan timers (Resideo).
- 40+ existing ST91xx fan timers via the instruction-sheet harness list.
Will not replace
- Any integrated furnace control (50A55, S9200U, HK42FZ, PCBBF, ComfortBridge). Those boards already include the fan timer.
- Two-stage communicating IFCs. Outdoor defrost boards.
Field notes
- If the furnace has one board that does gas + blower, you do not want this carton.
- If the furnace has a separate S89 / S8610 / 50E47 module plus an ST91xx timer, this is the timer half.
- DIP-switch heat/cool delays. Replaceable fuse. Not a 50A55 substitute.
Plates that name this carton
No FieldBench plate lists this as a pick. It may still replace an older silk — read the replace list above.