ICP Control Circuit Board for SUP18E230V1IA — B0353101 w/ Mounting Plate | Ships Today

Overview

This is the genuine ICP/Tempstar/Heil control circuit board (OEM part B0353101) with its matching control board mounting plate (B03529) for the SUP18E230V1IA. The board is the brain of the unit — it reads thermostat demand, sequences the compressor, fan, and defrost functions, monitors safety inputs, and energizes the appropriate relays and outputs. When the board fails, the unit may be completely dead, ignore thermostat calls, run components out of sequence, lock out on faults, or behave erratically. Replacing it with the exact OEM board and bracket restores correct, factory-spec control logic and clean mounting in the cabinet.

Specifications

Compatibility

Built as a direct OEM-fit replacement for the ICP SUP18E230V1IA and other Tempstar/Heil/Comfortmaker units engineered around this board. Match the printed board number to your original before ordering, as control boards are revision-specific.

Installation Guide

1. Safety First — Disconnect power and verify zero voltage with a multimeter.
2. Access — Remove the electrical service panel.
3. Document — Photograph every wire harness and terminal on the old board before disconnecting.
4. Remove — Unplug the connectors, remove the screws holding the board and plate, and lift the assembly out.
5. Install — Mount the new board on its plate, reattach to the cabinet, and reconnect each harness exactly per your photos.
6. Test — Restore power and run a full heating and cooling cycle to confirm correct sequencing.

Signs You Need a Replacement

• Unit is completely unresponsive to thermostat calls.
• Components run out of sequence or fail to stage.
• Repeated fault lockouts or blinking diagnostic codes.
• Visible burn marks, scorched traces, or swollen components on the board.

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.