ICP Defrost Control Board for YJ018G — OEM 34332101 Heat Pump Timer | Ships Today
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Overview
The ICP defrost control board (OEM part 34332101) governs the defrost cycle on your ICP / Tempstar / Heil YJ018G heat pump. It tracks outdoor coil temperature and accumulated run time, then triggers a defrost cycle by energizing the reversing valve and stopping the outdoor fan so frost melts off the coil. A failed board causes one of two problems: the unit never defrosts and ice chokes the coil, dropping heating capacity; or it defrosts excessively, wasting energy and short-cycling. The board runs on a 24V control circuit and coordinates the compressor, reversing valve, and supplemental heat.
Specifications
| Spec | Value |
|---|---|
| Part Number | 34332101 |
| Type | Defrost Control Board |
| Brand | ICP / Tempstar / Heil |
| Control Voltage | 24V |
| Application | Heat Pump Defrost |
| Fitment | OEM Replacement |
Compatibility
Engineered as a direct OEM fit for the ICP / Tempstar / Heil YJ018G heat pump and matching ICP-family units that originally used part 34332101. Confirm your existing board's part number before ordering.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker; verify zero voltage with a multimeter.
- Access — Remove the outdoor unit's electrical access panel.
- Document — Photograph every wire and terminal before disconnecting.
- Remove — Label and unplug each connector, remove the mounting screws, and lift out the old board.
- Install — Mount the new 34332101 board, reconnect every lead to match your photo, and set defrost timer pins to match the original.
- Test — Restore power and confirm the unit completes a normal defrost cycle.
Signs You Need a Replacement
- Outdoor coil ices over and never clears in heating mode
- Unit defrosts too frequently or runs continuously
- No reversing-valve or fan response during defrost
- Burn marks, corrosion, or cracked traces on the board
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