ICP Defrost Control Board for YG018GC1 — Heat Pump | Ships Today
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Overview
This is the OEM defrost control board (ICP part 34332101) for the ICP / Tempstar / Heil YG018GC1 heat pump. The defrost board is the brain of the outdoor unit's defrost cycle — it monitors the defrost thermostat/sensor, runs the timing logic (typically selectable 30/60/90-minute intervals), energizes the reversing valve coil, and controls the contactor and auxiliary heat during defrost. A failed board can leave the outdoor coil iced over, prevent the unit from switching modes, cause no-heat conditions, or trigger continuous defrost. Replacing the board restores proper defrost timing and protects the compressor from running into a frozen coil.
Specifications
| Spec | Value |
|---|---|
| Part Number | 34332101 |
| Type | Defrost Control Board |
| Brand | ICP (Tempstar / Heil / Comfortmaker) |
| Control Voltage | 24V |
| Function | Defrost timing, reversing valve & contactor control |
| Fitment | OEM Direct Replacement |
Compatibility
Direct OEM fit for the ICP YG018GC1 heat pump and other ICP-family heat pumps (Tempstar, Heil, Comfortmaker, Arcoaire) that specify defrost board 34332101. Match the connector layout, terminal labeling, and defrost timer pin selection against your existing board before installing.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
- Access — Remove the condenser control/access panel to reach the defrost board.
- Document — Photograph all wiring, plug positions, and the defrost timer jumper/pin setting before disconnecting.
- Remove — Unplug the connectors, release the mounting standoffs/screws, and lift out the old board.
- Install — Mount the new board, reconnect every plug per your photo, and set the defrost timer pin to match the original.
- Test — Restore power, initiate a defrost (or force one), and confirm correct mode switching and timing.
Signs You Need a Replacement
- Outdoor coil frosts or ices over and never defrosts.
- Heat pump won't switch between heating and cooling.
- Unit stuck in continuous defrost or never initiates defrost.
- No response from the board, blown onboard fuse, or burnt/scorched components.
Shipping & Returns
Ships same day on orders placed before 3 PM CST. 30-day returns on unused parts. 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