ICP Defrost Control Board for WCH5484GKA200 — Heat Pump | Ships Today

Overview

This OEM defrost control board (part number 1173636) governs the defrost cycle on your ICP WCH5484GKA200 heat pump. It reads the coil temperature sensor and accumulated run time, then commands the reversing valve and auxiliary heat to melt frost off the outdoor coil in cold-weather heating. A failed board can let the coil ice over, skip defrost, lock into a continuous defrost, or stop energizing the compressor and fan. Since it controls the 24V circuit that ties the whole outdoor unit together, a bad board often masquerades as other faults — installing a new board restores proper defrost timing and full heat-pump heating capacity.

Specifications

Compatibility

Direct OEM replacement for the ICP/Tempstar/Heil WCH5484GKA200 heat pump condensing unit and related models sharing the same defrost board platform. Verify the part number and connector layout against your existing board.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the condenser control panel to expose the board.
3. Document — Photograph every harness, jumper, and sensor lead before unplugging.
4. Remove — Unplug the connectors, release the standoffs or screws, and lift out the old board.
5. Install — Mount the new board, match any defrost-time jumper to the original setting, and reconnect each harness per your photo.
6. Test — Restore power, run a heat call, and confirm normal operation plus a forced defrost cycle.

Signs You Need a Replacement

• Outdoor coil freezes up and never defrosts
• Unit stuck in a continuous defrost cycle
• No compressor or fan output on a valid call
• Erratic reversing valve operation or weak heating

Shipping & Returns

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