ICP Defrost Control Board for YE018G — 24V Heat Pump | Ships Today
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Overview
The ICP defrost control board (OEM part 34332101) is the brain of the defrost cycle on the YE018G heat pump. It monitors outdoor coil temperature and elapsed run time, then energizes the reversing valve and stops the outdoor fan to melt frost off the coil so the system keeps heating efficiently in cold weather. Operating on 24V control voltage, it manages defrost timing, the auxiliary/emergency heat relay, and compressor anti-short-cycle protection. When this board fails you will typically see the outdoor unit ice over and stay frozen, the system locked in defrost or never entering it, no auxiliary heat, or the compressor failing to start. Replacing the board restores correct, automatic defrost operation.
Specifications
| Spec | Value |
|---|---|
| Part Number | 34332101 |
| Type | Defrost Control Board |
| Brand | ICP (Tempstar / Heil / Comfortmaker) |
| Control Voltage | 24V |
| Function | Timed/demand defrost, reversing valve, aux heat relay |
| Application | Heat pump outdoor unit |
Compatibility
Engineered as the OEM replacement for ICP family heat pump model YE018G, including matching Tempstar, Heil, and Comfortmaker badge-engineered units that share the same chassis and part number 34332101. Always confirm the number printed on your existing board before ordering.
Installation Guide
- Safety First — Disconnect power at the breaker and the outdoor disconnect, then verify zero voltage with a multimeter.
- Access — Remove the outdoor unit's control-panel service cover.
- Document — Photograph every wire and terminal position before disconnecting anything.
- Remove — Unplug the low-voltage harness and sensor leads, release the board mounting screws/standoffs, and lift the old board out.
- Install — Mount the new board on the same standoffs and reconnect each lead exactly per your photo, including the defrost thermostat sensor.
- Test — Restore power, run a heat-pump heating cycle, and confirm the unit enters and exits defrost normally.
Signs You Need a Replacement
- Outdoor coil ices over and never clears
- System stuck in defrost or skips defrost entirely
- No auxiliary or emergency heat during defrost
- Compressor or outdoor fan will not energize
Shipping & Returns
Ships same day before 3 PM CST. 30-day returns. 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