ICP Defrost Control Board for RYMA10N001 — OEM 1052757 Heat Pump Board | Ships Today

Overview

This is a genuine OEM defrost control board (part number 1052757) for the ICP Tempstar Heil RYMA10N001 heat pump condensing unit. The defrost control board is the brain of a heat pump's outdoor defrost cycle — it monitors coil temperature and run time, then commands the unit to reverse into defrost mode to melt frost off the outdoor coil during winter operation. When this board fails, the heat pump can ice over completely, lose heating capacity, short-cycle, or fail to switch between heating and cooling. Symptoms of a bad defrost board include a frozen outdoor coil, no auxiliary/emergency heat, the reversing valve not energizing, or the unit running continuously without defrosting. This board operates on a 24V control circuit and is a direct, plug-in replacement for the original.

Specifications

Compatibility

This board is the factory-specified defrost control for the ICP/Tempstar/Heil RYMA10N001 heat pump. ICP-family equipment (Tempstar, Heil, Comfortmaker, Arcoaire) frequently shares the same control platform, so this OEM part may also service related models — always verify against your unit's 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 any wiring.
2. Access — Remove the outdoor unit's control panel cover to expose the defrost board.
3. Document — Take a clear photo of every wire and terminal position before disconnecting anything.
4. Remove — Label and unplug the low-voltage harness, defrost thermostat lead, and sensor connections, then unscrew the old board from its standoffs.
5. Install — Mount the new 1052757 board, reconnect each wire exactly as photographed, and confirm the defrost timing pins match the original setting.
6. Test — Restore power and verify the unit enters heating, energizes the reversing valve, and initiates a defrost cycle on demand.

Signs You Need a Replacement

• Outdoor coil freezes over and the unit never defrosts.
• Heat pump fails to switch between heating and cooling modes.
• Reversing valve solenoid does not energize during defrost.
• Unit short-cycles or runs continuously with no heat output.

Shipping & Returns

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