What are the specs for this Control Board?

The correct replacement for Tempstar model T4H430GKC100 — 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 T4H430GKC100 — 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 T4H430GKC100 — Heat Pump | Ships Today

Name: Tempstar Defrost Control Board for T4H430GKC100 — Heat Pump | Ships Today
Brand: Tempstar
SKU: 1173636-GEN
Price: 149.00 USD
Availability: InStock

SKU: 1173636-GEN Brand: Tempstar

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Overview

This genuine OEM defrost control board (P/N 1173636) is the brain of the Tempstar T4H430GKC100 heat pump's defrost cycle. During heating, frost builds on the outdoor coil; the defrost board monitors run time and coil temperature (via the defrost thermostat/sensor) and periodically reverses the system into a short cooling cycle to melt accumulated ice, energizing the reversing valve and shutting the outdoor fan as needed. A failed board leads to a coil that ices over and blocks airflow, a heat pump stuck in defrost, no defrost at all, or no outdoor unit operation. Symptoms include heavy ice buildup, weak heating, the outdoor fan running when it shouldn't, or no response on a call for heat.

Specifications

Spec	Value
Part Number	1173636
Type	Defrost Control Board
Brand	Tempstar (ICP / Heil)
Control Voltage	24V
Function	Defrost timing & reversing valve control
Fitment	OEM

Compatibility

Direct-fit OEM replacement for the Tempstar T4H430GKC100 heat pump and other ICP-family outdoor units (Heil, Comfortmaker, Arcoaire) that specify the 1173636 defrost board. Verify your existing board part number before ordering.

Installation Guide

Safety First — Disconnect power at the breaker and disconnect, then verify zero voltage with a multimeter.
Access — Remove the outdoor unit's electrical service panel.
Document — Photograph every wire and connector on the board before disconnecting.
Remove — Unplug the harness connectors and unscrew/unclip the old board from its standoffs.
Install — Mount the new board and reconnect each connector exactly per your photo.
Test — Restore power, confirm normal operation, and initiate a defrost test if accessible.

Signs You Need a Replacement

Outdoor coil ices over and stays frozen
Heat pump stuck in defrost or never defrosts
Outdoor fan or reversing valve behaving erratically
No outdoor unit operation on a call for heat

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

Tempstar Defrost Control Board f...

$149.00

Frequently Asked Questions

Does this Control Board fit my Tempstar T4H430GKC100 — Heat Pump | Ships Today?

Yes. This is the factory-specified OEM control board for the Tempstar T4H430GKC100 — 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 T4H430GKC100 — 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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