Honeywell ST9120U1011 Universal Electronic Fan Timer Furnace Control Board

Product Description

Genuine Honeywell ST9120U1011 Universal Electronic Fan Timer, designed for residential gas-fired forced-air heating systems.

This universal replacement control board integrates combustion blower and circulating fan operations, provides adjustable heating and cooling fan delays, and features LED diagnostics for easier troubleshooting.

According to the original Honeywell cross-reference chart, this universal fan timer replaces 41 existing Honeywell control models.

Manufacturer: Honeywell
Model: ST9120U1011
Series: ST9120U
Board Marking: ST9120U 1.2
Product Type: Universal Electronic Fan Timer / Furnace Control Board

Full Replacement Cross-Reference — All 41 Model Numbers

The following 41 models are listed on the original Honeywell replacement chart.

ST9101 Series (2 models)

• ST9101A1014

• ST9101A1022

ST9120 Series (18 models)

• ST9120A2004

• ST9120C2002

• ST9120C2010

• ST9120C2028

• ST9120C3000

• ST9120C3018

• ST9120C4008

• ST9120C4016

• ST9120C4040

• ST9120C4057

• ST9120C5005

• ST9120C5013

• ST9120D3009

• ST9120G2024

• ST9120G2032

• ST9120G4004

• ST9120G4038

• ST9120U1003

ST9141 Series (3 models)

• ST9141A1002

• ST9141A1028

• ST9141B1001

ST9150 Series (6 models)

• ST9150A1003

• ST9150B2000

• ST9150B2018

• ST9150B2026

• ST9150B2034

• ST9150C4057

ST9160 Series (12 models)

• ST9160A1002

• ST9160B1001

• ST9160B1019

• ST9160B1027

• ST9160B1035

• ST9160B1043

• ST9160B1050

• ST9160B1068

• ST9160B1076

• ST9160B1084

• ST9160C1000

• ST9160C1018

Total: 41 Honeywell replacement model numbers.

Honeywell ST9120U1011 — Replacement Compatibility Chart

Honeywell ST9120U1011 Universal Electronic Fan Timer replaces the following 41 Honeywell control models, according to the manufacturer's cross-reference chart.

Important: These are manufacturer-listed replacement part numbers. Proper installation may require wiring conversion, adapter harnesses, and DIP switch adjustments. Verify compatibility with the specific furnace before installation.

These are manufacturer-published replacement references. Installation may require wiring conversion, adapter harnesses, and DIP switch adjustments according to the original control model.

Compatible HVAC Systems

Designed for compatible residential gas warm-air furnace applications, including selected equipment from:

• Rheem

• Armstrong

• Ducane

• ICP (International Comfort Products)

• York

• Goodman

• Bard

• Snyder General

• Nordyne

• Skymark

• Consolidated Industries

• Trade-branded furnace systems

Compatibility must be verified using the original fan timer model number and furnace wiring specifications.

Technical Specifications

Adjustable Timing Settings

Heating Fan:

• Fan ON delay: 30 or 60 seconds

• Fan OFF delay: 60, 120, 150 or 180 seconds

Cooling Fan:

• Fan ON delay: 4 or 30 seconds

• Fan OFF delay: 30 or 60 seconds

Post-purge timing: 5 seconds

Timing selections are configurable using the onboard DIP switches.

Key Features

• Universal replacement for 41 listed Honeywell control models

• Controls combustion blower and circulating fan

• Adjustable heating and cooling fan delays

• Electronic air cleaner and humidifier connections

• LED status and fault diagnostics

• Replaceable fuse

• Supports compatible thermostat systems

• Optional continuous low-speed fan operation

• Designed for professional HVAC replacement and repair

Important Compatibility Information

Please verify your existing control board model number before purchasing.

Although this universal board replaces the models listed above, installation is not necessarily plug-and-play. Some applications require model-specific wiring adapters, connection changes, and DIP switch configuration.

All installations should be performed by a qualified HVAC technician following the furnace manufacturer's wiring diagram and the Honeywell installation instructions.

Please contact us before purchasing if you need additional photos or product identification information.