ICP Defrost Control Board for YG018G — Heat Pump OEM | Ships Today
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Overview
This is a genuine OEM defrost control board (P/N 34332101) for the ICP / Tempstar / Heil YG018G heat pump. The defrost board is the brain of heat-pump operation: it monitors the outdoor coil temperature and ambient conditions, then initiates and terminates the defrost cycle to melt frost and ice off the outdoor coil during heating. It also coordinates the reversing valve, condenser fan, compressor, and any auxiliary/emergency heat staging. When this board fails, the outdoor coil can ice over and choke airflow, heating performance drops, the compressor short-cycles, or the system fails to switch between heating and cooling. Symptoms include a heavily frosted outdoor unit that never defrosts, a unit stuck in defrost, no compressor operation, or a board with visibly burnt traces, scorched relays, or a blown fuse.
Specifications
| Spec | Value |
|---|---|
| Part Number | 34332101 |
| Type | Defrost Control Board |
| Brand | ICP (Tempstar / Heil) |
| Control Voltage | 24V |
| Function | Defrost timing, reversing valve & fan/compressor control |
| Fit | OEM Direct Replacement |
Compatibility
Direct OEM replacement for the ICP / Tempstar / Heil YG018G heat pump and other ICP-family outdoor units that specify the 34332101 defrost board. Confirm your existing board's part number and connector layout before ordering, as defrost boards are model-specific.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
- Access — Remove the outdoor unit's electrical/control service panel.
- Document — Photograph every wire harness and connector position on the existing board.
- Remove — Unplug the connectors, release the standoffs/screws, and lift out the old board.
- Install — Seat the new board on the standoffs and reconnect each harness exactly as photographed.
- Test — Restore power, run a heating cycle, and confirm proper defrost initiation and termination.
Signs You Need a Replacement
- Outdoor coil ices over and never enters defrost
- Unit stuck in defrost or constantly reversing
- No compressor or fan operation in heat-pump mode
- Visible burnt traces, scorched relays, or a blown onboard fuse
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