What are the specs for this Control Board?

The correct replacement for Tempstar model T2H348GKD100 — 24V Heat Pump | 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 T2H348GKD100 — 24V Heat Pump | 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 T2H348GKD100 — 24V Heat Pump | Ships Today

Name: Tempstar Defrost Control Board for T2H348GKD100 — 24V Heat Pump | Ships Today
Brand: Tempstar
SKU: 1173636-GEN
Price: 119.95 USD
Availability: InStock

SKU: 1173636-GEN Brand: Tempstar

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Overview

This genuine OEM defrost control board (OEM part 1173636) manages the defrost cycle on the Tempstar T2H348GKD100 heat pump. The board monitors the defrost thermostat and elapsed run time, then reverses the system into defrost mode to melt frost off the outdoor coil during heating operation — switching the reversing valve, shutting off the outdoor fan, and energizing supplemental heat as needed. A failed defrost board leaves the outdoor coil iced over, which kills heating capacity, raises run times, and can cause the compressor to overheat or trip. Common failure signs include an outdoor unit that frosts/ices up and never clears, no defrost cycle at all, the unit stuck in defrost, or no power to the contactor coil.

Specifications

Spec	Value
OEM Part Number	1173636
Type	Defrost Control Board
Brand	Tempstar (ICP / Heil)
Control Voltage	24 VAC
Function	Heat-pump defrost timing & control

Compatibility

Direct-fit OEM replacement for the Tempstar T2H348GKD100 and related ICP / Heil / Comfortmaker / Tempstar heat pump platforms that use this defrost control board. Match the board's part number and connector layout to your existing board before installing.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker, then verify zero voltage with a multimeter.
Access — Remove the outdoor unit's electrical access panel.
Document — Photograph every wire harness and connector position on the existing board.
Remove — Unplug the connectors, release the board's standoffs/screws, and lift out the old board.
Install — Seat the new board on its standoffs and reconnect each harness to the matching terminal per your photo and the wiring diagram.
Test — Restore power, initiate a heating call, and verify the defrost cycle and reversing-valve operation.

Signs You Need a Replacement

Outdoor coil ices over and never defrosts during heating.
Unit gets stuck running in defrost mode.
No 24V output to the contactor, reversing valve, or fan.
Erratic heat-pump behavior or short cycling in cold weather.

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...

$119.95

Frequently Asked Questions

Does this Control Board fit my Tempstar T2H348GKD100 — 24V Heat Pump | Ships Today?

Yes. This is the factory-specified OEM control board for the Tempstar T2H348GKD100 — 24V Heat Pump | 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 T2H348GKD100 — 24V Heat Pump | 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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