ICP Defrost Control Board for YG048GC1 — Heat Pump | Ships Today
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Overview
This OEM defrost control board (part number 34332101) is the electronic brain of the ICP/Tempstar/Heil YG048GC1 heat pump's defrost system. In heating mode, frost and ice accumulate on the outdoor coil; the defrost board monitors coil temperature and elapsed run time, then periodically reverses the system into a brief cooling cycle to melt that ice and restore efficient heat transfer. It coordinates the reversing valve, condenser fan, and auxiliary heat during each defrost event. When this board fails, the heat pump can ice over completely, lose heating capacity, run constant or excessively long defrost cycles, or skip defrost altogether. Typical failure symptoms include a heavily iced outdoor coil, weak or no heat, the fan stopping at the wrong time, or the reversing valve failing to switch on schedule. Installing a fresh OEM defrost board restores correct, timed defrost operation and protects the compressor and coil from ice damage.
Specifications
| Spec | Value |
|---|---|
| Part Number | 34332101 |
| Type | Defrost Control Board |
| Brand | ICP / Tempstar / Heil |
| Control Voltage | 24V |
| Function | Heat Pump Defrost Timing & Sequencing |
| Fitment | OEM |
Compatibility
Direct OEM replacement for the ICP/Tempstar/Heil YG048GC1 heat pump condensing unit. This defrost board is used across a range of ICP-family outdoor heat pump units; verify the existing board's part number and connector layout against 34332101 before ordering.
Installation Guide
- Safety First — Disconnect power at the outdoor disconnect and breaker, then verify zero voltage with a multimeter before touching the control box.
- Access — Remove the condenser service panel to expose the defrost board.
- Document — Photograph every wire harness, sensor lead, and jumper/timer pin setting on the old board.
- Remove — Unplug the connectors, note the defrost timer pin selection, and unscrew the board from its standoffs.
- Install — Mount the new board, set the defrost timer pins to match the original, and reconnect every harness and sensor per your photo.
- Test — Restore power, initiate a forced defrost (or run in heating), and confirm the board sequences the reversing valve and fan correctly.
Signs You Need a Replacement
- Outdoor coil fully iced or frosted over in heating
- Defrost cycles never run, or run far too long/often
- Reversing valve or condenser fan mistimed during defrost
- Reduced heating output or short cycling
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