ICP Defrost Control Board for YE042G — Heat Pump | Ships Today
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Overview
This is a genuine OEM defrost control board (part number 34332101) for the ICP / Tempstar / Heil YE042G heat pump. The defrost board is the brain of outdoor heat pump operation: it monitors the defrost thermostat and timer, energizes the reversing valve coil, controls the compressor contactor, and cycles the unit into and out of defrost so ice does not build up on the outdoor coil during heating season.
When this board fails, the symptoms are wide-ranging — the heat pump may not run at all, may ice over and never defrost, may stay locked in defrost, or may fail to switch between heating and cooling. Power surges, moisture intrusion, and failed relays on the board are the usual culprits.
Specifications
| Spec | Value |
|---|---|
| Part Number | 34332101 |
| Type | Defrost Control Board |
| Brand | ICP / Tempstar / Heil |
| Application | Heat Pump Outdoor Unit |
| Fitment | OEM |
Compatibility
Direct OEM replacement for the ICP/Tempstar/Heil YE042G heat pump and shared-platform Comfortmaker/Day & Night models using the same defrost board. Match the printed board part number and connector layout to 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-box cover to expose the board.
- Document — Photograph every connector and wire position; note any DIP-switch or jumper settings.
- Remove — Unplug the harness connectors, release the standoffs or screws, and lift out the old board.
- Install — Mount the new board, transfer any jumper/DIP settings, and reconnect each harness per your photo.
- Test — Restore power and confirm normal heating operation and a proper defrost cycle.
Signs You Need a Replacement
- Outdoor unit does not power up or run in heating
- Coil ices over and the unit never enters defrost
- Unit gets stuck in defrost and blows cold air
- Heat pump will not switch between heating and cooling
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