ICP Defrost Control Board for RYMA10H001A — OEM 1052757 Heat Pump Board | Ships Today

Overview

This is a genuine OEM defrost control board (part number 1052757) for the ICP Tempstar Heil RYMA10H001A heat pump. The defrost control board governs the outdoor unit's defrost cycle — monitoring coil temperature and accumulated run time, then commanding a reversal into defrost mode to clear frost from the outdoor coil in cold weather. A failed board lets the coil ice over, kills heating capacity, prevents the reversing valve from energizing, or causes the unit to run nonstop without defrosting. Typical symptoms include a solid sheet of ice on the outdoor coil, no switch between heating and cooling, no emergency heat, or continuous operation. This board runs on a 24V control circuit and installs as a direct, plug-in replacement for the original.

Specifications

Compatibility

This board is the factory-specified defrost control for the ICP/Tempstar/Heil RYMA10H001A heat pump. Because ICP-family equipment (Tempstar, Heil, Comfortmaker, Arcoaire) shares control platforms, this OEM part frequently services related models — verify against your nameplate or existing part number before ordering.

Installation Guide

1. Safety First — Disconnect power at the outdoor disconnect and breaker, then verify zero voltage with a multimeter before touching wiring.
2. Access — Remove the outdoor unit's control-panel cover to expose the defrost board.
3. Document — Photograph every wire and terminal position before disconnecting.
4. Remove — Label and unplug the low-voltage harness, defrost thermostat, and sensor leads, then unscrew the old board from its standoffs.
5. Install — Mount the new 1052757 board, reconnect each wire exactly as photographed, and match the defrost timing pin setting to the original.
6. Test — Restore power and verify the unit heats, energizes the reversing valve, and initiates a defrost cycle on demand.

Signs You Need a Replacement

• Outdoor coil ices over and never defrosts.
• Heat pump won't switch between heating and cooling.
• Reversing valve solenoid fails to energize during defrost.
• Unit short-cycles or runs continuously with no heat.

Shipping & Returns

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