What are the specs for this Control Board?

The correct replacement for Tempstar model T4H424GKB200 — 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 T4H424GKB200 — 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 T4H424GKB200 — OEM 1173636 | Ships Today

Name: Tempstar Defrost Control Board for T4H424GKB200 — 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

The defrost control board (OEM part 1173636) governs the defrost cycle on your Tempstar T4H424GKB200 heat pump. It watches outdoor coil temperature and compressor run time, then commands the reversing valve and shuts off the outdoor fan to melt frost off the coil so the system keeps delivering heat. A failed board causes ice buildup on the coil, constant or absent defrost cycles, short-cycling, or a complete loss of heating. This is a genuine 24V OEM replacement built to the original specifications.

Specifications

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

Compatibility

Direct-fit replacement for the Tempstar T4H424GKB200 heat pump and other ICP-family heat pumps sold under the Tempstar, Heil, Comfortmaker, and ICP brands that use OEM 1173636. Match the number on your existing board to confirm fitment.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter before touching any wiring.
Access — Remove the outdoor unit's control-panel service cover.
Document — Photograph every wire and connector on the old board before disconnecting anything.
Remove — Unplug the low-voltage harnesses, release the mounting standoffs or screws, and lift out the old defrost board.
Install — Mount the new 1173636 board, reconnect each harness exactly as photographed, and set any defrost-timing jumper to match the original.
Test — Restore power and verify the unit enters and exits a defrost cycle correctly.

Signs You Need a Replacement

Outdoor coil stays iced or frosted over in cold weather
Heat pump runs in defrost constantly or never defrosts
No heat output or repeated short-cycling
Burn marks, corrosion, or a damaged trace on the old 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 T4H424GKB200 — OEM 1173636 | Ships Today?

Yes. This is the factory-specified OEM control board for the Tempstar T4H424GKB200 — 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 T4H424GKB200 — 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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