What are the specs for this Control Board?

The correct replacement for Tempstar model T4H448GKD100 — 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 T4H448GKD100 — 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 T4H448GKD100 — OEM #1173636 | Ships Today

Name: Tempstar Defrost Control Board for T4H448GKD100 — OEM #1173636 | Ships Today
Brand: Tempstar
SKU: 1173636-GEN
Price: 98.00 USD
Availability: InStock

SKU: 1173636-GEN Brand: Tempstar

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Overview

This OEM defrost control board (part #1173636) is the brain of the defrost cycle on your Tempstar T4H448GKD100 heat pump. It monitors coil temperature and run time, then commands the unit into defrost to clear ice from the outdoor coil and switches it back to heating once the coil is clear. When this board fails you'll see common symptoms like the outdoor unit freezing solid, the system stuck in defrost or never defrosting, the reversing valve not energizing, or no 24V output to the fan and compressor circuits. A faulty board can also cause intermittent no-heat calls in cold weather.

Specifications

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

Compatibility

Direct OEM fit for the Tempstar T4H448GKD100 heat pump and other ICP-family (Heil, Comfortmaker, Tempstar) condensing units that originally shipped with board #1173636. Always confirm the OEM number on your existing board before ordering.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
Access — Remove the outdoor unit control-panel service cover.
Document — Photograph every wire and terminal position before disconnecting anything.
Remove — Label and unplug all connectors, release the standoffs/screws, and lift out the old board.
Install — Seat the new board on the standoffs and reconnect each wire exactly per your photo.
Test — Restore power, force a defrost (or use the test pins) and confirm the unit defrosts and returns to heating normally.

Signs You Need a Replacement

Outdoor coil ices over and unit never defrosts
System stuck in defrost mode continuously
No 24V output to reversing valve, fan, or compressor
Visible burnt traces, scorched relays, or a fault LED on the board

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

Tempstar Defrost Control Board f...

$98.00

Frequently Asked Questions

Does this Control Board fit my Tempstar T4H448GKD100 — OEM #1173636 | Ships Today?

Yes. This is the factory-specified OEM control board for the Tempstar T4H448GKD100 — 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 T4H448GKD100 — 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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