ICP Defrost Control Board for YC036GA — Heat Pump Defrost Timer | Ships Today
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Overview
The ICP defrost control board (OEM part 34332100) is the brain of the defrost cycle on your YC036GA heat pump. It monitors the outdoor coil temperature sensor and a timing interval, then energizes the reversing valve and stops the outdoor fan to melt frost off the coil during cold-weather operation. When this board fails, the system either never defrosts (coil ices over and heating capacity drops) or defrosts constantly (short cycling, high bills, hot/cold swings indoors). It operates on a 24V control signal and includes the relays and logic that coordinate the compressor, fan, and reversing valve during defrost.
Specifications
| Spec | Value |
|---|---|
| Part Number | 34332100 |
| Type | Defrost Control Board |
| Brand | ICP (Tempstar / Heil / Comfortmaker) |
| Control Voltage | 24V |
| Function | Time/temperature defrost logic |
| Fit | OEM Replacement |
Compatibility
Designed as the factory replacement for the ICP YC036GA heat pump and other Tempstar, Heil, and Comfortmaker units that originally shipped with board 34332100. Always confirm the printed part number on your old board matches before installing.
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 position before disconnecting anything.
- Remove — Label and unplug the low-voltage connectors and sensor leads, then unscrew the failed board from its standoffs.
- Install — Mount the new 34332100 board, reconnect each wire exactly per your photo, and seat the defrost sensor securely on the coil tube.
- Test — Restore power and force/observe a defrost cycle to confirm the reversing valve and fan respond correctly.
Signs You Need a Replacement
- Outdoor coil ices over and never clears in heat mode
- Unit defrosts far too often (short cycling, steam clouds)
- Reversing valve or outdoor fan won't switch during defrost
- Visible burnt traces, scorched relays, or corrosion 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