Tempstar Defrost Control Board for T2H348GKA200 — 24V Heat Pump Board | Ships Today
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Overview
This OEM defrost control board (part number 1173636) is the electronic brain of the Tempstar T2H348GKA200 heat pump's defrost cycle. Operating on 24 volts, it monitors the outdoor coil temperature and run time, then commands the reversing valve, condenser fan, and auxiliary heat to clear frost and ice from the outdoor coil during heating season. When this board fails, the heat pump can ice over solid, blow cold air in heat mode, short cycle, or skip defrost entirely. Common symptoms include a frozen outdoor coil, no defrost cycle, the reversing valve failing to shift, or auxiliary heat that never engages. Replacing a faulty defrost board restores efficient, reliable heat-pump heating.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173636 |
| Type | Defrost Control Board |
| Brand | Tempstar (ICP / Heil) |
| Control Voltage | 24 V |
| Function | Defrost timing & reversing-valve control |
| Fits Model | T2H348GKA200 |
Compatibility
Direct OEM replacement for the Tempstar T2H348GKA200 heat pump. This 24V defrost board is shared across many ICP-family outdoor heat pumps (Heil, Comfortmaker, Arcoaire) built on the same control platform. Verify the original part number 1173636 before ordering to ensure correct defrost timing and terminal layout.
Installation Guide
- Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
- Access — Remove the outdoor unit's control panel cover.
- Document — Photograph every wire and connector on the board before removing anything.
- Remove — Unplug the harness connectors, release the board standoffs/screws, and lift out the old board.
- Install — Seat the new board on the standoffs and reconnect each harness exactly per your photo, including the defrost thermostat sensor lead.
- Test — Restore power and confirm normal heat-pump operation; force a defrost test if accessible to verify the cycle.
Signs You Need a Replacement
- Outdoor coil ices or frosts over and never defrosts.
- Heat pump blows cold air in heating mode.
- Reversing valve fails to shift during defrost.
- Unit short cycles or auxiliary heat never engages.
Shipping & Returns
Ships same day on orders placed 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