HoneywellHot-surface ignition module only — fan timer stays on the furnace
S8910U1000
Universal HSI module (not an IFC)
Igniter
120 VAC HSI (Norton 201/271 class). Local or remote flame sense.
Motor
No blower relays.
Replace list
- Over 800 White-Rodgers, Robertshaw, and Resideo HSI modules (Resideo).
- Resideo S89 / S890 family. White-Rodgers 50E47 / 50F47. Robertshaw HS780.
Will not replace
- Integrated furnace controls (S9200U, 50A55-843, ICM282B, PCBBF).
- Intermittent-pilot systems (S8610U). 80 V nitride-only modules unless the sheet names them.
Field notes
- S8910U3000 is the later carton and supersedes S8910U1000 on many counters — same job.
- If the dead part is only the ignition module and the ST91xx / analog fan timer is still good, use this — not S9200U.
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.