What are the specs for this Control Board?

The correct replacement for Tempstar model TXH542GKA100 — 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 TXH542GKA100 — 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 TXH542GKA100 — OEM 1173636 | Ships Today

Name: Tempstar Defrost Control Board for TXH542GKA100 — OEM 1173636 | Ships Today
Brand: Tempstar
SKU: 1173636-GEN
Price: 149.00 USD
Availability: InStock

SKU: 1173636-GEN Brand: Tempstar

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Overview

This is the OEM defrost control board (part 1173636) for the Tempstar TXH542GKA100 heat pump. The defrost board monitors outdoor coil temperature and run time, then commands a defrost cycle to melt frost off the outdoor coil during heating — reversing the valve, stopping the outdoor fan, and energizing auxiliary heat as needed. A failed board leaves the outdoor coil iced over (killing heating capacity), runs defrost too often or never, or causes the unit not to switch modes at all. The board also coordinates the contactor and reversing-valve coil, making it central to heat-pump operation.

Specifications

Spec	Value
Part Number	1173636
Type	Defrost Control Board
Brand	Tempstar
Function	Heat-pump defrost timing & control
Application	Outdoor heat pump section
Fitment	OEM direct replacement

Compatibility

Engineered for the Tempstar TXH542GKA100 and matching ICP/Heil heat-pump platforms using this defrost board. Match the part number and connector layout to the original board before installing.

Installation Guide

Safety First — Disconnect power at the disconnect and verify zero voltage with a multimeter.
Access — Remove the outdoor unit control panel cover.
Document — Photograph every harness plug and the defrost sensor/timer pin settings before disconnecting.
Remove — Unplug each connector, note any jumper or DIP timer setting, and unclip the old board from its standoffs.
Install — Mount the new board, match the defrost timer/jumper setting to the original, and reconnect every harness per your photo.
Test — Restore power, force a defrost (per the board's test pins), and confirm proper valve shift, fan stop, and timing.

Signs You Need a Replacement

Outdoor coil ices up and stays frozen in heat mode
Unit never enters or never exits defrost
No outdoor operation despite a thermostat call
Visible burn marks, swollen relays, or cracked traces on the board

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 TXH542GKA100 — OEM 1173636 | Ships Today?

Yes. This is the factory-specified OEM control board for the Tempstar TXH542GKA100 — 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 TXH542GKA100 — 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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