Description
Looking to replace your aging Carrier or ICP furnace control board? If you’re pulling out a Carrier/ICP HK42FZ0xx, 325878-751, or a CEPL13xxxx series board, the 50M56U-751 is a direct-fit. With harness adapters included, there’s no need to rewire.
Designed For
- Single-stage furnaces
- PSC blowers
- 120V hot surface ignitors
Not For
- Two-stage or ECM systems
- Twinning with other Carrier boards
- Conversion from other ignition types
Key Features & Benefits
Fast & Clean Board Swaps
Wiring adapters are included for both old-style block plugs and newer in-line harnesses.
One Board for the Whole Furnace
Runs the gas valve, ignitor, inducer, blower, humidifier (120V or 24V), and electronic air cleaner, giving you one integrated control instead of multiple add-ons.
Covers Common Blower Motor Types
Works with furnaces that use standard PSC blowers as well as many Variable Speed and ECMx motors.
Easy Troubleshooting
A system diagnostic LED with fault recall lets you pull stored fault history, speeding up diagnosis after lockouts or intermittent issues.
Continuous Fan and Comfort Options
Offers a low-speed continuous fan option and dehumidification mode, so you can fine-tune comfort and airflow without extra controls.
Built-In Transformer Protection
A replaceable automotive-style fuse protects the low-voltage side, helping prevent transformer damage from shorts or wiring mistakes.
Factory-Style Timings
Uses Carrier single-stage, standard timings: pre-purge, fan-on, fan-off, and post-purge.
Key Specs
- Application: Single stage integrated HSI furnace control kit for Carrier/ICP gas furnaces
- Ignition Type: 120V hot surface ignition (HSI)
- Control Voltage: 24–25 VAC, 50/60 Hz
- Controlled Loads: Gas valve, ignitor, inducer, blower, humidifier (120V & 24V), electronic air cleaner
- Fan Options: Low-speed continuous fan; separate heat and cool fan outputs
- Diagnostics: LED status indicator with fault recall
- Low-Voltage Protection: Replaceable automotive-style fuse
- Operating Temperature Range: -40°F to 176°F (-40°C to 80°C)
- Mounting: Surface-mount, multi-position
Frequently Asked Questions
Does the kit include the interconnect harnesses, adapter harnesses (including the 11-pin ‘flip’ harness), and mounting hardware?
The kit includes the 50M56-751 control board, a full set of interconnect/adapter harnesses (including the 11-pin “flip” harness), installation instructions/OEM cross-reference, and a small bag of accessories, so you typically have all the wiring pieces and basic hardware needed for the swap.
If the old board is an earlier style with different plugs, do the included harnesses cover older blocks or Molex connectors?
The included wiring adapters are designed to handle both the old block-style and newer in-line main harness connectors used on Carrier/ICP single-stage boards.
