What are the specs for this Control Board?

The correct replacement for Tempstar model T4H448GKB100 — OEM 1173636 | 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 T4H448GKB100 — OEM 1173636 | 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 T4H448GKB100 — OEM 1173636 | Ships Today

Name: Tempstar Defrost Control Board for T4H448GKB100 — OEM 1173636 | Ships Today
Brand: Tempstar
SKU: 1173636-GEN
Price: 129.95 USD
Availability: InStock

SKU: 1173636-GEN Brand: Tempstar

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Overview

This is the OEM defrost control board (part number 1173636) for the Tempstar T4H448GKB100 heat pump. The defrost control board is the brain of the heat pump's defrost cycle — it monitors outdoor coil temperature and run time, then commands the reversing valve, auxiliary heat, and outdoor fan to clear frost from the coil during cold-weather operation. When this board fails, the unit cannot defrost properly, leading to ice buildup on the outdoor coil, reduced heating capacity, short cycling, or a heat pump that locks out entirely. Replacing it with the genuine OEM board restores correct defrost timing and protects the compressor.

Specifications

Spec	Value
Part Number	1173636
Type	Defrost Control Board
Brand	Tempstar
Fits Model	T4H448GKB100
Control Voltage	24V
Application	Heat Pump Defrost Control

Compatibility

Designed as the factory replacement for the Tempstar T4H448GKB100 heat pump. The same board is shared across many ICP-family (Tempstar / Heil / Comfortmaker) heat pumps of this series — always confirm your existing board's part number reads 1173636 before installing.

Installation Guide

Safety First — Disconnect power at the outdoor disconnect and verify zero voltage with a multimeter before touching any wiring.
Access — Remove the control panel access cover on the outdoor unit.
Document — Photograph every wire and terminal on the existing board before disconnecting anything.
Remove — Label and disconnect the low-voltage and sensor leads, then unclip or unscrew the failed board from its standoffs.
Install — Mount the new 1173636 board, reconnect each wire exactly per your photo, and seat the defrost sensor.
Test — Restore power and confirm the unit runs in heat mode and initiates a normal defrost cycle.

Signs You Need a Replacement

Outdoor coil ices over and never clears during heating
Heat pump short cycles or won't switch out of defrost
Auxiliary/emergency heat runs constantly
No 24V output to the reversing valve or outdoor fan

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...

$129.95

Frequently Asked Questions

Does this Control Board fit my Tempstar T4H448GKB100 — OEM 1173636 | Ships Today?

Yes. This is the factory-specified OEM control board for the Tempstar T4H448GKB100 — OEM 1173636 | 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 T4H448GKB100 — OEM 1173636 | 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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