ICP Defrost Control Board for YD048GA Heat Pump — OEM Module | Ships Today
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Overview
This OEM defrost control board (part number 34330100) manages the defrost cycle on the ICP/Tempstar/Heil YD048GA heat pump. It monitors the defrost thermostat and elapsed run time, then commands the reversing valve and shuts off the outdoor fan to melt frost off the outdoor coil during heating operation. A failed defrost board leaves the outdoor coil iced over, kills heating capacity, and can trip the system on high pressure. The board also coordinates compressor timing and fan control on the outdoor unit.
Specifications
| Spec | Value |
|---|---|
| Part Number | 34330100 |
| Type | Defrost Control Board |
| Brand | ICP / Tempstar / Heil / Comfortmaker |
| Function | Defrost timing, reversing valve & fan control |
| Application | Heat Pump Outdoor Unit |
Compatibility
Direct OEM replacement for the ICP/Tempstar/Heil YD048GA heat pump and other ICP-family outdoor units that use the 34330100 defrost board. Match the part number and connector layout to your existing board before ordering.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage at the board with a multimeter.
- Access — Remove the condensing/heat-pump unit service panel.
- Document — Photograph every wire harness and plug position on the old board before disconnecting.
- Remove — Unplug the harnesses, release the standoffs or screws, and lift out the old board.
- Install — Mount the new board, then reconnect each harness and plug exactly per your photo.
- Test — Restore power, run a heating cycle, and confirm a normal defrost sequence and fan operation.
Signs You Need a Replacement
- Outdoor coil stays caked in ice or frost during heating
- Heat pump never enters or never exits defrost mode
- Reduced or no heating output with the outdoor fan misbehaving
- System trips on high pressure or short-cycles in heat mode
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