What are the specs for this Control Board?

The correct replacement for Tempstar model T2H348GKA100 — 24V Heat Pump Board | 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 T2H348GKA100 — 24V Heat Pump Board | 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 T2H348GKA100 — 24V Heat Pump Board | Ships Today

Name: Tempstar Defrost Control Board for T2H348GKA100 — 24V Heat Pump Board | Ships Today
Brand: Tempstar
SKU: 1173636-GEN
Price: 144.95 USD
Availability: InStock

SKU: 1173636-GEN Brand: Tempstar

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Overview

This OEM defrost control board (part number 1173636) manages the defrost cycle on the Tempstar T2H348GKA100 heat pump. Running on 24 volts, it monitors outdoor coil temperature and compressor run time, then commands the reversing valve, condenser fan, and auxiliary heat to melt frost and ice off the outdoor coil during heating season. A failed board can leave the heat pump iced over, blowing cold air in heat mode, short cycling, or skipping defrost altogether. Common symptoms include a frozen outdoor coil, no defrost cycle, the reversing valve not shifting, or auxiliary heat that never engages. Installing a new defrost board restores efficient, reliable heat-pump heating through the cold months.

Specifications

Spec	Value
Part Number	1173636
Type	Defrost Control Board
Brand	Tempstar (ICP / Heil)
Control Voltage	24 V
Function	Defrost timing & reversing-valve control
Fits Model	T2H348GKA100

Compatibility

Direct OEM replacement for the Tempstar T2H348GKA100 heat pump. This 24V defrost board is shared across many ICP-family outdoor heat pumps (Heil, Comfortmaker, Arcoaire) built on the same control platform. Verify the original part number 1173636 before ordering to ensure correct defrost timing and terminal layout.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
Access — Remove the outdoor unit's control panel cover.
Document — Photograph every wire and connector on the board before removing anything.
Remove — Unplug the harness connectors, release the board standoffs/screws, and lift out the old board.
Install — Seat the new board on the standoffs and reconnect each harness exactly per your photo, including the defrost thermostat sensor lead.
Test — Restore power and confirm normal heat-pump operation; force a defrost test if accessible to verify the cycle.

Signs You Need a Replacement

Outdoor coil ices or frosts over and never defrosts.
Heat pump blows cold air in heating mode.
Reversing valve fails to shift during defrost.
Unit short cycles or auxiliary heat never engages.

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...

$144.95

Frequently Asked Questions

Does this Control Board fit my Tempstar T2H348GKA100 — 24V Heat Pump Board | Ships Today?

Yes. This is the factory-specified OEM control board for the Tempstar T2H348GKA100 — 24V Heat Pump Board | 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 T2H348GKA100 — 24V Heat Pump Board | 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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