ICP Defrost Control Board for YJ036G1 — Heat Pump Defrost Board | Ships Today
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Overview
This is the genuine OEM defrost control board (part number 34332101) for the ICP / Heil / Tempstar YJ036G1 heat pump. The defrost board is the brain of the outdoor unit in heating mode: it monitors the defrost thermostat and run time, then initiates and terminates defrost cycles, energizes the reversing valve solenoid, and switches the condenser fan and compressor as needed to clear frost from the outdoor coil. A failed defrost board causes the most common cold-weather heat pump complaints — a coil that ices over solid, a unit that never defrosts (or defrosts constantly), or a system that loses heating capacity. Replacing the board restores proper defrost timing and protects the compressor from running against a blocked, iced coil.
Specifications
| Spec | Value |
|---|---|
| Part Number | 34332101 |
| Type | Defrost Control Board |
| Brand | ICP (Heil / Tempstar / Comfortmaker) |
| Control Voltage | 24 VAC |
| Function | Defrost timing, reversing valve & fan control |
| Fitment | OEM Replacement |
Compatibility
Direct factory replacement for the defrost control board in the ICP / Heil / Tempstar YJ036G1 heat pump and related ICP-family outdoor units that use this board. Match the part number and connector layout to your original board before installing.
Installation Guide
- Safety First — Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter.
- Access — Remove the condenser service panel to reach the control box.
- Document — Photograph every connector and wire on the existing board before disconnecting.
- Remove — Unplug the harnesses, release the board's mounting standoffs or screws, and lift out the old board.
- Install — Seat the new board on the standoffs, then reconnect each harness to its matching terminal per your photo (note defrost sensor, reversing valve, fan, and 24V connections).
- Test — Restore power and confirm normal heating operation; initiate a test/forced defrost if the board supports it to verify the cycle.
Signs You Need a Replacement
- Outdoor coil ices over and never clears in heating mode
- Unit defrosts too frequently or stays in defrost too long
- Reversing valve or condenser fan not energizing on schedule
- Loss of heating capacity or short-cycling in cold weather
Shipping & Returns
Ships same day on orders placed 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