ICP Defrost Control Board for YJ024G1 — Heat Pump Timer Board | Ships Today

Overview

This OEM defrost control board (part #34332101) is the genuine replacement timer board for the ICP YJ024G1 heat pump. The defrost board monitors coil temperature and run time to determine when frost is building on the outdoor coil, then initiates a defrost cycle — reversing the system, shutting off the outdoor fan, and energizing auxiliary heat — before returning to normal operation. It also coordinates the contactor, reversing valve, and fan based on thermostat demand. When this board fails, the heat pump may ice over, fail to defrost, short cycle, or stop responding to the thermostat entirely. As the brain of the outdoor unit's heating logic, a faulty board is a common cause of poor winter performance.

Specifications

Compatibility

Direct-fit OEM replacement for the ICP YJ024G1 and compatible Tempstar, Heil, and Comfortmaker heat pumps using part 34332101. Match the board's part number and connector layout before ordering.

Installation Guide

1. Safety First — Disconnect power at the breaker and outdoor disconnect, then verify zero voltage with a multimeter.
2. Access — Remove the condenser service panel to reach the control box.
3. Document — Photograph every wire and plug on the board, and note the defrost timer pin setting.
4. Remove — Disconnect the harnesses, release the standoffs or screws, and lift out the old board.
5. Install — Mount the new board, set the defrost timer pin to match the original, and reconnect all harnesses per your photos.
6. Test — Restore power and confirm normal heating, cooling, and (if testable) a forced defrost cycle.

Signs You Need a Replacement

• Outdoor coil ices over and never defrosts
• Heat pump short cycles or won't respond to the thermostat
• No defrost cycle initiates in cold weather
• Visible burnt traces, scorched relays, or corrosion on the board

Shipping & Returns

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