Description
Because it’s made specifically for single-stage Trane systems with 120V hot surface ignitors, the White-Rodgers 50A55-3797 is a solid grab-and-go replacement for many older Trane furnaces that are still in service today.
Key Features & Benefits
OEM Trane Replacement
Built as a direct replacement for several high-volume Trane integrated furnace controls (CNT02789, CNT02891, CNT03799, D341122P01, D341235P01, D341235P03) and matching White-Rodgers 50A55-474 / 50A55-476 / 50A55-571 boards, so you can fix common models with one part.
Integrated Heating Control
One board manages the burner, inducer motor, and 2-speed PSC blower, coordinating the full heating cycle, so the furnace runs like the original factory setup.
Supports Add-On Air Cleaner and Humidifier
Provides dedicated 120V outputs for a whole-home electronic air cleaner and humidifier (up to 1 amp), so you can keep IAQ accessories powered without extra controls.
Diagnostic Indicators
On-board status LED and fault codes help you quickly see what the furnace is doing and where it stopped in the sequence, reducing guesswork and repeat trips.
Safety Timings and Adjustable Fan Delay
Uses factory-standard safety timing for ignition and lockout, plus selectable fan-off delays, to protect the heat exchanger and keep comfort and airflow where they should be.
Fuse Protection on The Control
A built-in 5-amp automotive-style fuse helps protect the low-voltage side of the control from shorts or wiring issues, instead of sacrificing the transformer.
Frequently Asked Questions
| My furnace has a 120 V or an 80 V ignitor, does it matter? | It matters. 50A55-3797 is for 120 V HSI systems only. If your OEM uses an 80 V ignitor, use the correct 80 V-output control instead. |
| Does it work with standard 24-V thermostats (including Wi-Fi)? | Yes, terminals R, C, W, Y, G support conventional single-stage stats. Communicating/proprietary bus thermostats are not supported. |
| What comes in the kit? | The control module, instructions, and an OEM cross-reference sheet. Harnesses/standoffs are not listed. Reuse or source as needed. |
