ICP Defrost Control Board for YD030GA Heat Pump — OEM 34330100 | Ships Today
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Overview
The ICP defrost control board (OEM part 34330100) governs the defrost cycle on your YD030GA heat pump. It tracks outdoor coil temperature and compressor run time, then triggers the reversing valve and auxiliary heat to melt frost off the outdoor coil in cold weather. A failed board causes the coil to ice over, the unit to lock out, or the system to run without ever defrosting. It runs on a 24V control circuit and ties into the defrost thermostat, reversing valve coil, and contactor.
Specifications
| Spec | Value |
|---|---|
| Part Number | 34330100 |
| Type | Defrost Control Board |
| Brand | ICP / Tempstar / Heil |
| Control Voltage | 24V |
| Application | Heat Pump Defrost |
| Fitment | OEM Replacement |
Compatibility
Direct OEM replacement for the ICP/Tempstar/Heil YD030GA heat pump and other units in the same family that originally shipped with defrost board 34330100. Match your existing board's part number before ordering.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
- Access — Remove the control panel cover from the outdoor unit.
- Document — Photograph every wire and terminal on the old board before disconnecting.
- Remove — Label and unplug the low-voltage connectors, release the mounting standoffs/screws, and lift out the failed board.
- Install — Seat the new board on the standoffs and reconnect each wire exactly per your photo.
- Test — Restore power and confirm a normal heating cycle and an on-demand defrost cycle.
Signs You Need a Replacement
- Outdoor coil ices over and never defrosts
- Heat pump won't switch between heating and cooling
- Auxiliary/emergency heat runs constantly
- No 24V output to the reversing valve or contactor
Shipping & Returns
Ships same day on orders placed 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