ICP Defrost Control Board for YD024GA — Heat Pump | Ships Today
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Overview
This is a genuine OEM defrost control board (part #34330100, "DEFROST CONTROL BOARD") for the ICP / Tempstar / Heil YD024GA heat pump. The defrost board is the brains of the outdoor unit in heating mode: it monitors the defrost thermostat/sensor, runs the selectable defrost timer (typically 30/60/90 minutes), energizes the reversing valve and compressor, and turns the outdoor fan off so accumulated frost melts off the coil. When the board fails, the heat pump either never defrosts — letting the outdoor coil ice over and starving the system of heat — or defrosts constantly, hammering efficiency and comfort. Symptoms of board failure include a frozen outdoor coil, auxiliary/emergency heat running far too often, or the unit failing to switch between heat and defrost cycles. A new board restores proper defrost staging and heating performance.
Specifications
| Spec | Value |
|---|---|
| Part Number | 34330100 |
| Type | Defrost Control Circuit Board |
| Brand | ICP / Tempstar / Heil / Comfortmaker |
| Control Voltage | 24V |
| Function | Defrost timing, reversing valve & fan control |
| Timer Options | Selectable defrost interval (jumper-set) |
Compatibility
Fits the ICP/Tempstar/Heil YD024GA heat pump and related ICP-family heat pumps originally equipped with defrost board 34330100. Confirm the printed part number and connector layout on your existing board before ordering.
Installation Guide
- Safety First — Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter.
- Access — Remove the condenser service/control panel to reach the board.
- Document — Photograph every wire, connector, and the defrost timer jumper position.
- Remove — Unplug the harnesses, release the standoffs/screws, and lift out the old board.
- Install — Mount the new board, set the timer jumper to match the original, and reconnect every harness per your photos.
- Test — Restore power, run a heat call (or forced defrost), and confirm proper defrost initiation and termination.
Signs You Need a Replacement
- Outdoor coil ices over and the unit never defrosts
- Heat pump defrosts too frequently, killing efficiency
- Auxiliary/emergency heat runs constantly in heat mode
- No reversing-valve or fan response during the defrost cycle
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