ICP Defrost Control Board for RYMA75H001A — Heat Pump | Ships Today

Overview

This is a genuine OEM defrost control board (part 1052757) for the ICP/Tempstar/Heil RYMA75H001A heat pump. The defrost board is the brain of the outdoor unit's heating cycle — it monitors coil temperature and run time, controls the reversing valve and defrost relay, and cycles the unit out of frost buildup so it can keep producing heat. A failed defrost board causes a heat pump to ice over, lose heating capacity, or run the auxiliary heat continuously, driving up energy bills.

Specifications

Compatibility

Fits the ICP, Tempstar, Heil, and Comfortmaker RYMA75H001A heat pump and related models using this defrost control. Always match the OEM part number to your existing board, as defrost board pinouts and timing differ between platforms.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
2. Access — Remove the outdoor unit's electrical service panel.
3. Document — Photograph every wire and connector on the board before disconnecting.
4. Remove — Unplug the harnesses, release the mounting standoffs/screws, and lift out the old board.
5. Install — Seat the new board on its standoffs and reconnect each connector exactly per your photo.
6. Test — Restore power and verify the unit completes a normal heating and defrost cycle.

Signs You Need a Replacement

• Outdoor coil ices over and won't clear
• Heat pump won't switch into or out of defrost
• Auxiliary/emergency heat runs constantly
• Reversing valve doesn't shift on a defrost call

Shipping & Returns

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