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Green rectangular circuit board with components and connectors

KXINXIANG

KXINXIANG 50A55-743 gas furnace control board accessory

SKU CH-DWDR-F72NA MPN 50A55-743

Automatic gas-cut ignition control board monitors obstructions, shuts off gas flow and retries ignition for compatible Amana and Goodman furnaces

  • TypeHVAC›Furnace Parts & Accessories›Circuit Boards
  • Direct replacement for Amana and Goodman furnace boards
  • Automatic gas-cut ignition monitors and analyses system obstructions
  • Rapid gas-flow shut-off protects against unsafe conditions
  • Automatic ignition retry restarts furnace after fault correction
  • Operates on 25 VAC 50/60 Hz input and 120 VAC control voltage

Replacement Furnace Control Board

The 50A55-743 is a new gas furnace control board designed to replace OEM parts in Amana and Goodman furnaces. It matches a wide list of manufacturer part numbers including B18099-26, PCBBF110S, and ICM286. HVAC technicians and homeowners repairing compatible units can use this board to restore ignition control. It is not for buyers who need a universal board for brands outside the listed compatibility.

Automatic Gas-Cut Ignition Operation

The board functions as an automatic gas-cut ignition control system that continuously monitors and analyzes system obstructions. It rapidly shuts off gas flow when a fault is detected and automatically retries ignition after the fault is corrected. Input voltage is 25VAC at 50 or 60 Hz, while control voltage is 120VAC. It is not for installers who require a board with different voltage ratings or without the auto-retry safety feature.

Direct OEM Replacement Installation

Installation involves swapping the existing control board with this direct replacement using the original mounting points and wiring connections. Correct polarity for the 25VAC input and 120VAC control voltage must be observed to avoid damage. Verifying the furnace model against the compatible part number list before ordering prevents fitment issues. It is not for users who cannot safely work with line-voltage furnace wiring.

Highlights

  • Direct replacement for Amana and Goodman furnace boards
  • Automatic gas-cut ignition monitors and analyses system obstructions
  • Rapid gas-flow shut-off protects against unsafe conditions
  • Automatic ignition retry restarts furnace after fault correction
  • Operates on 25 VAC 50/60 Hz input and 120 VAC control voltage

Specifications

TypeHVAC›Furnace Parts & Accessories›Circuit Boards

Questions about this item

How much power does the 50A55-743 board draw while the furnace runs all day?

The board operates on 25 VAC at 50/60 Hz for its logic circuit and switches 120 VAC for the gas valve and igniter; power draw is determined by those connected loads.

Which existing furnace parts must be present for this 50A55-743 replacement to function?

You need a 25 VAC transformer, a 120 VAC gas valve, a hot-surface igniter, a flame sensor, limit and rollout switches, plus the original wiring harness that matches the board's terminal layout.

Will the 50A55-743 work with the original B18099-26 board's wiring and flame-sensing method in my older Goodman unit?

Yes, the 50A55-743 is listed as a direct replacement for B18099-26, B1809926S and PCBBF110 series boards, using the same 25 VAC input, 120 VAC control voltage and flame-rectification sensing.

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