What are the specs for this Control Board?

The correct replacement for Tempstar model T4H424GKD200 — Heat Pump | Ships Today is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Tempstar equipment which lists the model number T4H424GKD200 — Heat Pump | Ships Today.

Is this control board compatible with Bryant or Payne systems too?

Many Tempstar parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

Tempstar

Tempstar Defrost Control Board for T4H424GKD200 — Heat Pump | Ships Today

Name: Tempstar Defrost Control Board for T4H424GKD200 — Heat Pump | Ships Today
Brand: Tempstar
SKU: 1173636-GEN
Price: 135.00 USD
Availability: InStock

SKU: 1173636-GEN Brand: Tempstar

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Overview

This is the genuine OEM defrost control board (part number 1173636) for the Tempstar T4H424GKD200 heat pump. The defrost control board governs the outdoor unit's defrost cycle — monitoring coil temperature and accumulated run time, then commanding the reversing valve and outdoor fan to melt frost and ice off the outdoor coil during heating operation. It also enforces compressor timing, anti-short-cycle delays, and auxiliary heat staging. A failed board leaves the coil iced over, the unit running nonstop without heat, or the defrost cycle never initiating or never terminating. Installing the correct OEM board restores proper defrost logic and protects the compressor from damage.

Specifications

Spec	Value
Part Number	1173636
Type	Defrost Control Board
Brand	Tempstar (ICP / Heil family)
Control Voltage	24V
Application	Heat Pump — Defrost Control
Fitment	OEM Replacement

Compatibility

Direct OEM replacement for the Tempstar T4H424GKD200 heat pump. This board (1173636) is shared across closely related ICP-family heat pump platforms including Heil and Comfortmaker. Verify the part number printed on your existing board before ordering.

Installation Guide

Safety First — Disconnect power at the outdoor disconnect and breaker. Verify zero voltage with a multimeter.
Access — Remove the control panel access cover on the outdoor unit.
Document — Photograph every wire and connector on the existing board before disconnecting.
Remove — Unplug the harnesses, release the mounting tabs or screws, and lift out the old board.
Install — Mount the new board in the same orientation and reconnect each harness exactly per your photos.
Test — Restore power, run the unit in heat mode, and confirm the defrost cycle starts and ends correctly.

Signs You Need a Replacement

Outdoor coil ices over and never defrosts.
Unit runs continuously in cold weather without heating.
Reversing valve or outdoor fan unresponsive during defrost.
No status LEDs or erratic fault-code blinking 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

Tempstar Defrost Control Board f...

$135.00

Frequently Asked Questions

Does this Control Board fit my Tempstar T4H424GKD200 — Heat Pump | Ships Today?

Yes. This is the factory-specified OEM control board for the Tempstar T4H424GKD200 — Heat Pump | Ships Today. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the control board on my Tempstar T4H424GKD200 — Heat Pump | Ships Today?

Difficulty: Advanced (1–2 hrs)
Step 1: Turn off breaker. Step 2: PHOTOGRAPH all wire connections before touching anything. Step 3: Label each wire with tape. Step 4: Disconnect all wires, remove old board. Step 5: Mount new board, reconnect all wires matching your photo exactly. Step 6: Restore power and test all modes. Exact part number match is critical.

My HVAC system is completely dead. What could be wrong?

Completely dead HVAC (no LED on board) = failed control board or blown fuse. Check board fuse first (3A or 5A, costs $1–$5). If fuse is good and board has power but no LED, board is dead. Always photograph wiring before replacing.

Is this control board compatible with Bryant or Payne too?

Many Tempstar parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Tempstar control board?

OEM essential. Control boards are model-specific with precise firmware and connector layouts. Aftermarket boards rarely match all functions and can cause intermittent failures or safety issues. Always match the exact OEM part number.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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