Tempstar Defrost Control Board for T4H560GKD100 — Heat Pump Timer Board | Ships Today
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Overview
This is the genuine OEM Defrost Control Board (part #1173636) for the Tempstar T4H560GKD100 heat pump. The defrost board is the brain of the outdoor unit in heating mode: it monitors the defrost thermostat and the timer interval, then initiates and terminates the defrost cycle by energizing the reversing valve, locking out the auxiliary fan, and bringing on backup heat as needed. It also handles compressor time-delay protection. When this board fails, the heat pump can ice over and lose capacity in cold weather, never enter or never exit defrost, or fail to protect the compressor with proper anti-short-cycle delays. A scorched relay, a failed timer, or storm/surge damage are the usual culprits.
Specifications
| Spec | Value |
|---|---|
| Part Number | 1173636 |
| Type | Defrost Control Board |
| Brand | Tempstar |
| Control Voltage | 24V |
| Functions | Defrost timing, reversing valve, compressor time delay |
| Application | Heat Pump Outdoor Unit |
Compatibility
Direct-fit replacement for the Tempstar T4H560GKD100 heat pump and shared across ICP-family (Heil, Comfortmaker, Tempstar) heat pumps using this control platform. Always confirm OEM part number 1173636 and the board's connector layout against your existing board before ordering.
Installation Guide
- Safety First — Disconnect power at the disconnect and verify zero voltage with a multimeter before opening the control box.
- Access — Remove the service panel to expose the defrost control board on its standoffs.
- Document — Photograph every wire and plug connection on the board; note any DIP-switch / defrost-interval settings.
- Remove — Unplug each harness, release the mounting standoffs, and lift out the failed board.
- Install — Mount the new board, set the defrost interval to match the original, and reconnect each harness per your photo.
- Test — Restore power, confirm normal heating operation, and force a defrost (per service instructions) to verify the cycle starts and terminates correctly.
Signs You Need a Replacement
- Outdoor coil ices over and the unit never defrosts
- Heat pump gets stuck in defrost or won't switch to heating
- No 24V output to the reversing valve or no compressor time delay
- Visible burn marks, scorched relays, or surge damage on the board
Shipping & Returns
Ships same day on orders placed before 3 PM CST. 30-day hassle-free 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