Tempstar Defrost Control Board for TCH436AKA1 — Heat Pump OEM | Ships Today
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Overview
This is a genuine OEM defrost control board (part number 1086070) for the Tempstar TCH436AKA1 heat pump. The defrost board is the brain of heat-pump operation: it monitors the coil temperature sensor and accumulated run time, then initiates and terminates the defrost cycle by switching the reversing valve, de-energizing the outdoor fan, and energizing auxiliary heat. When the board fails, the outdoor coil ices over and stays frozen, the unit loses heating capacity, the reversing valve mis-sequences, or the defrost cycle never starts or never ends. A failed defrost board is a frequent cause of poor heat-pump performance in cold weather. This OEM replacement restores correct defrost timing and reversing-valve control.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1086070 |
| Type | Defrost Control Board |
| Brand | Tempstar (ICP / Heil) |
| Control Voltage | 24V |
| Function | Defrost Timing & Reversing Valve Control |
| Application | Heat Pump |
| Fitment | OEM Direct Replacement |
Compatibility
Direct OEM replacement defrost board for the Tempstar TCH436AKA1 heat pump and matching ICP / Heil / Comfortmaker units that use this board and connector layout. Match the part number and connector pinout to your existing board before ordering.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
- Access — Remove the control-panel service panel on the condensing unit.
- Document — Photograph every plug, harness, and terminal on the board before disconnecting.
- Remove — Unplug the wiring harnesses and unscrew the old board from its standoffs.
- Install — Mount the new board, then reconnect each harness and sensor exactly per your photo.
- Test — Restore power, initiate a defrost test, and confirm proper reversing-valve and fan sequencing.
Signs You Need a Replacement
- Outdoor coil ices over and won't defrost.
- Defrost cycle never starts or never terminates.
- Reversing valve mis-sequences or auxiliary heat won't engage.
- Visible burn marks, corrosion, or failed relays on the board.
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