Product Description
White-Rodgers 50D50U-843 Universal 24V IP + DSI Spark Module
The White-Rodgers 50D50U-843 is a versatile universal replacement ignition control designed for both 24V intermittent pilot (IP) and direct spark ignition (DSI) applications. It is built to help simplify service calls by covering a broad range of legacy ignition modules while also offering modern setup and diagnostic features that can make troubleshooting and replacement easier in the field.
24V Intermittent Pilot (IP) 24V Direct Spark Ignition (DSI) 1000+ Cross-Reference Coverage White-Rodgers Connect App 7-Segment Diagnostics Field Service Universal Replacement
Important: Universal replacement does not always mean direct one-to-one installation without setup. Please confirm ignition type, wiring, timing, flame sensing, and appliance requirements before ordering or installing.
Why the 50D50U-843 Is a Popular Replacement Choice
Broad replacement flexibility This universal ignition module is designed to replace a large range of older intermittent pilot and direct spark controls, making it useful when an original part is obsolete, difficult to source, or no longer practical to keep in stock.
Helpful setup and diagnostics The module supports setup through the White-Rodgers Connect app and includes a 7-segment display to help technicians work through configuration and fault-code information more efficiently.
Built for real field service needs Contractors often choose universal controls like this to reduce truck stock complexity and increase the chances of restoring heat without waiting on a model-specific ignition board.
Cross-Reference and Replacement Search
The White-Rodgers 50D50U-843 is commonly used as a universal replacement across multiple ignition control families. If you are replacing an older control, use the search box below to look for a specific part number, brand family, or common reference number.
Search by full part number, partial number, or brand family.
S8610U3009 Honeywell / Resideo
S8610U1003 Honeywell / Resideo
S8610U1011 Honeywell / Resideo
S8610A1009 Honeywell / Resideo
S8600M3006 Honeywell / Resideo
S8600 Series Honeywell / Resideo
S86 Series Honeywell / Resideo
S90 Series Honeywell / Resideo
35-60 Fenwal
35-61 Fenwal
35-615516-111 Fenwal
35-605635-113 Fenwal
35-60J106-021 Fenwal
35 Series Controls Fenwal
780-715 Robertshaw
Selected Robertshaw Ignition Controls Robertshaw
G779 Family Johnson Controls / York
325-42681-00 Johnson Controls / York
025-42681-000 Johnson Controls / York
S1-02526363700 Johnson Controls / York
031-021283-000 Johnson Controls / York
LH33EP040 Carrier / ICP
LH33CZ010 Carrier / ICP
LH33CZ007 Carrier / ICP
LHCM600 Carrier / ICP
LH33WP001A Carrier / ICP
B13707-24 Goodman / Amana
80K12 Lennox / Allied Air
80K1201 Lennox / Allied Air
36G57 Lennox / Allied Air
36G5701 Lennox / Allied Air
49W66 Lennox / Allied Air
X852601 Lennox / Allied Air
SP10763C Rheem / Ruud
625040 Rheem / Ruud
625042 Rheem / Ruud
62-23554-02 Rheem / Ruud
CNT04722 Trane / American Standard
CNT4722 Trane / American Standard
CNT04721 Trane / American Standard
CNT4721 Trane / American Standard
50D50-843 White-Rodgers
50D50-801 White-Rodgers
50B48 Series White-Rodgers
50B49 Series White-Rodgers
50C49 Series White-Rodgers
50D49 Series White-Rodgers
Selected UTEC Controls UTEC
Selected BASO Controls BASO
Additional Legacy IP / DSI Controls Multiple Brands
No matches found in the visible cross-reference list. Try searching with fewer characters, a shorter root number, or a brand family such as Honeywell, Fenwal, Carrier, Trane, Lennox, Rheem, Goodman, or White-Rodgers.
Cross-reference note: This section highlights many of the common numbers buyers search for, but it is not intended to be a complete engineering compatibility guide. Final application match should always be verified before installation.
Common Service Symptoms
Furnace will not ignite When a heating system is calling for heat but the ignition sequence does not complete successfully, the ignition control may need to be tested and replaced if found defective.
No spark during startup A failure to produce spark at the proper point in the ignition cycle can indicate a problem with the ignition module, wiring, flame sensing, or related controls.
Repeated ignition retries If the system attempts ignition multiple times and then locks out, the ignition control path is often one of the components checked during diagnosis.
Intermittent pilot issues Pilot-related ignition failures, nuisance shutdowns, or unstable ignition sequences may point to a worn or failing control module in compatible systems.
Direct spark ignition problems DSI applications that click, try to light, or fail to prove flame consistently may require evaluation of the ignition board and associated system components.
Fault-code troubleshooting The 50D50U-843 includes expanded diagnostics that can be helpful when replacing an older board with limited or less clear troubleshooting feedback.
Contractor and Technician Use Cases
Reduce truck stock complexity Universal ignition modules can help service companies carry fewer model-specific boards while still covering a wide range of legacy applications.
Replace harder-to-find ignition controls This type of control is especially helpful when an original OEM board is discontinued, delayed, or impractical to source for a time-sensitive repair.
Support multiple equipment types Contractors working across furnaces, boilers, unit heaters, and other gas-fired equipment often prefer flexible controls that can be configured to match many older applications.
Improve field troubleshooting Modern setup and fault-display features can save time when compared with replacing older controls that offered less diagnostic feedback.
- Useful for HVAC service technicians handling residential and light commercial heating repairs
- Helpful for boiler service, gas furnace repair, unit heater service, and compatible specialty heating applications
- Commonly chosen when a technician needs a versatile replacement option for multiple older ignition control families
- Relevant for facilities maintenance teams and service professionals working on supported gas-fired equipment
Compatibility and Application Coverage
The 50D50U-843 is promoted for a broad range of heating-related applications. Actual compatibility depends on the original ignition strategy, voltage, wiring, flame sensing method, timing requirements, and overall appliance design.
Gas Furnaces Common for compatible intermittent pilot and direct spark furnace control replacements.
Boilers Used in selected boiler ignition applications where the original sequence and requirements match supported settings.
Water Heaters Can be used in certain gas-fired water heating applications when the original control arrangement is compatible.
Unit Heaters Often useful in gas unit heater repairs where a configurable universal control is preferred.
Infrared and Tube Heaters Applicable in supported systems where installation requirements align with the original control setup.
Other Gas-Fired Equipment Some cooking, laundry, and specialty heating equipment may also use compatible ignition control strategies.
Before ordering: confirm 24V control requirements, intermittent pilot or direct spark operation, wiring style, flame sensing method, original part number, and the sequence/timing needed for the application being repaired.
Frequently Asked Questions
What does the White-Rodgers 50D50U-843 do?
The 50D50U-843 is a universal 24V spark ignition module designed for intermittent pilot and direct spark applications. It manages ignition sequencing and related flame-proving functions in supported gas heat systems.
Is the 50D50U-843 used as a replacement for Honeywell S8610U controls?
Yes. It is commonly selected as a universal replacement option for Honeywell S8610U-style intermittent pilot controls. Final compatibility should still be confirmed for the original equipment and installation requirements.
Can this module replace Fenwal 35-60 or 35-61 controls?
It is commonly referenced for those control families in universal replacement applications. Configuration and installation should always be matched to the original system requirements before startup.
What kinds of equipment may use this ignition module?
Common application categories include gas furnaces, boilers, water heaters, unit heaters, and certain other gas-fired systems that use compatible intermittent pilot or direct spark ignition strategies.
How can I confirm this is the right replacement for my equipment?
The safest approach is to verify the original part number, ignition type, wiring layout, flame sensing method, voltage requirements, and timing sequence before ordering or installing.
Technical Snapshot
- Low voltage circuit: 24 Vac, 50/60 Hz
- Line voltage circuit: 120 Vac, 50/60 Hz
- Supports intermittent pilot and direct spark ignition applications
- 7-segment display for expanded setup and diagnostics
- White-Rodgers Connect app compatibility
- Designed as a universal replacement for a broad range of legacy ignition controls
Need Help Confirming the Right Ignition Control?
If you are replacing an older Honeywell, Fenwal, Robertshaw, Carrier, Johnson Controls, Lennox, Goodman, Rheem, Trane, or White-Rodgers ignition module, compare the original part number and system requirements before installation to help ensure the right fit.
