Tempstar Defrost Control Board for TCH430AKA1 — Heat Pump | Ships Today
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Overview
This is a genuine OEM defrost control board (part number 1086070) for the Tempstar TCH430AKA1 heat pump. The defrost board is the brain of the outdoor unit during heating: it monitors the defrost thermostat and a timed interval, then initiates a defrost cycle to melt frost off the outdoor coil. During defrost it reverses the valve, shuts off the condenser fan, and can energize auxiliary heat so the home stays comfortable. It also manages the compressor contactor and anti-short-cycle timing. When this board fails, the heat pump may ice over in cold weather, never defrost, lock out, or short-cycle — and a frozen outdoor coil quickly kills heating capacity.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1086070 |
| Type | Defrost Control Board |
| Brand | Tempstar |
| Control Voltage | 24V |
| Application | Heat Pump Defrost Control |
| Fit | OEM Direct Replacement |
Compatibility
Direct OEM replacement for the Tempstar TCH430AKA1 heat pump condenser. This defrost board is used across many ICP-family heat pumps (Tempstar, Heil, Comfortmaker, Arcoaire). Match the OEM part number 1086070 and confirm the timing-pin and terminal layout against your existing board before installing.
Installation Guide
- Safety First — Disconnect power at the breaker and outdoor disconnect; verify zero voltage with a multimeter.
- Access — Remove the condenser electrical panel to expose the board.
- Document — Photograph every wire and connector, and note the defrost timing jumper/pin setting on the old board.
- Remove — Unplug the harness connectors, release the board standoffs, and lift out the old board.
- Install — Mount the new board, set the defrost timing pin to match the original, and reconnect each harness per your photos.
- Test — Restore power, run the unit in heating, and force or observe a defrost cycle to confirm correct operation.
Signs You Need a Replacement
- Outdoor coil ices over and the unit never defrosts.
- Heat pump short-cycles or locks out in heating mode.
- No changeover to defrost despite frost on the coil.
- Burn marks, scorched traces, or a failed relay on the board.
Shipping & Returns
Ships same day on orders placed before 3 PM CST. 30-day returns on unused parts. 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