The Honeywell S8701A1042 is a Direct Spark Ignition (DSI) lockout module engineered to provide dependable ignition control for gas-fired heating appliances. With a 21-second trial-for-ignition timing sequence, this module initiates a spark, monitors for flame establishment, and locks out safely if ignition is not confirmed — protecting equipment and occupants from unburned gas accumulation.
Key Features
- 21-second trial-for-ignition period for reliable flame establishment
- Automatic lockout on ignition failure — requires manual reset for safe restart
- Direct Spark Ignition (DSI) design eliminates the need for a standing pilot
- Integrated flame sensing for continuous monitoring during burner operation
- Compact, durable construction suited for residential and light commercial gas heating systems
- Drop-in replacement for compatible Honeywell S8701 series applications
How DSI Lockout Works
Upon a call for heat, the S8701A1042 energizes the spark igniter and gas valve simultaneously. If a flame is not sensed within the 21-second trial period, the module de-energizes the gas valve and locks out, preventing further ignition attempts until the system is manually reset. This lockout function is a critical safety feature that guards against gas buildup in the heat exchanger.
Typical Applications
- Residential and commercial gas furnaces
- Gas-fired unit heaters
- Rooftop heating units
- Other gas appliances utilizing DSI ignition systems
Why Choose the Honeywell S8701A1042
Honeywell ignition modules are trusted throughout the HVAC industry for their consistent performance, long service life, and straightforward installation. The S8701A1042 is a proven solution for technicians seeking a reliable OEM-quality replacement to restore safe, efficient ignition control to gas heating equipment.
