What are the specs for this Control Board?

The correct replacement for Tempstar model T4H342GKA100 — 24V Heat Pump Timer | 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 T4H342GKA100 — 24V Heat Pump Timer | 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 T4H342GKA100 — 24V Heat Pump Timer | Ships Today

Name: Tempstar Defrost Control Board for T4H342GKA100 — 24V Heat Pump Timer | Ships Today
Brand: Tempstar
SKU: 1173636-GEN
Price: 124.95 USD
Availability: InStock

SKU: 1173636-GEN Brand: Tempstar

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Overview

The 1173636 Defrost Control Board is the OEM brain of your Tempstar T4H342GKA100 heat pump's outdoor unit. It monitors coil temperature and run time to initiate and terminate the defrost cycle, reversing the system briefly to melt frost from the outdoor coil during heating operation. The board also manages compressor timing, the reversing valve solenoid, and the outdoor fan during defrost. Operating on a 24V control signal, it protects the compressor with anti-short-cycle timing. When this board fails, the heat pump can frost over completely, lose heating capacity, run the compressor without defrosting, or fail to energize the outdoor unit at all.

Specifications

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

Compatibility

Engineered as a direct OEM fit for the Tempstar T4H342GKA100 heat pump and shared across many ICP-family outdoor units (Heil, Comfortmaker, Arcoaire) using the 1173636 board. Always confirm the part number printed on your existing board before ordering.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker, verify zero voltage with a multimeter.
Access — Remove the outdoor unit's control-panel access cover.
Document — Photograph all low-voltage and line-voltage connections before disconnecting.
Remove — Label and unplug each terminal, then unscrew the failed board from its standoffs.
Install — Mount the new 1173636 board and reconnect every wire exactly per your photo.
Test — Restore power and confirm proper defrost initiation and heating operation.

Signs You Need a Replacement

Outdoor coil ices over and never defrosts during heating
Compressor or outdoor fan won't energize
Reduced heating output or constant defrost cycling
Visible burn marks, corrosion, or failed relays 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...

$124.95

Frequently Asked Questions

Does this Control Board fit my Tempstar T4H342GKA100 — 24V Heat Pump Timer | Ships Today?

Yes. This is the factory-specified OEM control board for the Tempstar T4H342GKA100 — 24V Heat Pump Timer | 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 T4H342GKA100 — 24V Heat Pump Timer | 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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