ICP Defrost Control Board for YJ048G1 — Heat Pump | Ships Today
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Overview
This OEM defrost control board (ICP part #34332101) is the brain of the defrost cycle on your ICP YJ048G1 heat pump. It monitors the defrost thermostat and ambient conditions, times the heating/cooling cycles, and energizes the reversing valve and outdoor fan to melt frost off the outdoor coil in winter. When this board fails, the heat pump may ice over completely, run defrost too often (wasting energy and short-cycling), or never defrost at all. A faulty board can also leave the compressor or reversing valve unpowered, causing intermittent no-heat complaints that are easy to misdiagnose. This direct OEM replacement restores correct defrost timing and protection logic.
Specifications
| Spec | Value |
|---|---|
| Part Number | 34332101 |
| Type | Defrost Control Circuit Board |
| Brand | ICP (Tempstar / Heil / Comfortmaker) |
| Function | Defrost timing, reversing valve & fan control |
| Application | Heat pump outdoor unit |
| Fitment | OEM direct replacement |
Compatibility
Designed for the ICP YJ048G1 heat pump and matching Tempstar, Heil, and Comfortmaker outdoor units using this defrost board. Match the OEM part number and connector layout to your existing board before ordering.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, verify zero voltage with a multimeter.
- Access — Remove the condenser service panel to reach the control area.
- Document — Photo every plug, harness, and wire on the old board before disconnecting.
- Remove — Unplug each connector, release the board standoffs or screws, and lift the old board out.
- Install — Mount the new board, then reconnect each harness to its matching terminal per your photo.
- Test — Restore power, run a heating cycle, and confirm normal defrost operation and fault-free LED status.
Signs You Need a Replacement
- Outdoor coil ices over and never defrosts.
- Unit defrosts constantly or short-cycles.
- No 24V output to the reversing valve or fan during defrost.
- Board shows fault LED codes, scorching, or burned traces.
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