ICP Defrost Control Board for YJ018GB1 — Heat Pump | Ships Today
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Overview
This is a genuine OEM defrost control board (part number 1069364) for the ICP / Tempstar / Heil YJ018GB1 heat pump. The defrost board is the brain of the outdoor unit during heating season: it monitors the defrost thermostat and coil temperature, times the heating run cycle, and initiates a defrost cycle to melt frost off the outdoor coil by energizing the reversing valve and stopping the outdoor fan. It also coordinates the compressor and auxiliary heat. When the board fails, the heat pump may ice over completely, run inefficiently, short-cycle, or fail to switch between heating and cooling. Symptoms often include a frozen outdoor coil, weak heat output, or an outdoor unit that runs but never defrosts.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1069364 |
| Type | Defrost Control Board |
| Brand | ICP / Tempstar / Heil |
| Control Voltage | 24V |
| Function | Defrost timing, reversing valve and outdoor fan control |
| Fits Model | YJ018GB1 |
Compatibility
Designed for the ICP / Tempstar / Heil YJ018GB1 heat pump and other compatible ICP-family outdoor units that use this defrost control board. Verify the original board part number and connector layout before installing.
Installation Guide
- Safety First — Disconnect power at the outdoor disconnect and breaker, then verify zero voltage with a multimeter.
- Access — Remove the service panel from the condensing unit to reach the control box.
- Document — Photograph every plug, terminal, and wire on the existing board before disconnecting.
- Remove — Unplug the connectors, release the board standoffs or screws, and lift out the old defrost board.
- Install — Seat the new board on the standoffs and reconnect each harness and wire exactly per your photo.
- Test — Restore power, confirm the unit runs in heating, and verify a defrost cycle initiates (test pins can force defrost).
Signs You Need a Replacement
- Outdoor coil ices or frosts over and never clears
- Heat pump short-cycles or will not switch between heat and cool
- Weak or no heat output during heating season
- No defrost cycle even when frost is present
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days