What are the specs for this Control Board?

The correct replacement for Tempstar model T4A348GKD100 — Diagnostic Module | 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 T4A348GKD100 — Diagnostic Module | 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 Comfort Alert Control Board for T4A348GKD100 — Diagnostic Module | Ships Today

Name: Tempstar Comfort Alert Control Board for T4A348GKD100 — Diagnostic Module | Ships Today
Brand: Tempstar
SKU: 1177402-GEN
Price: 119.00 USD
Availability: InStock

SKU: 1177402-GEN Brand: Tempstar

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Overview

This genuine OEM Comfort Alert control board (part #1177402) is the diagnostic and protection module for the Tempstar T4A348GKD100 condensing unit. The Comfort Alert board continuously monitors compressor current and voltage to detect faults such as locked rotor, open windings, low or high voltage, short cycling, and missing run capacitor. It flashes coded alerts on an onboard LED so a technician can pinpoint problems quickly, and it protects the compressor by interrupting operation under dangerous conditions. Failure symptoms include no diagnostic LED activity, a compressor that won't run despite a good contactor and capacitor, false or stuck fault codes, and nuisance lockouts.

Specifications

Spec	Value
Part Number	1177402
Type	Comfort Alert Diagnostic Control Board
Brand	Tempstar
Function	Compressor monitoring & fault diagnostics
Control Voltage	24V

Compatibility

Factory replacement module for the Tempstar T4A348GKD100 air conditioner. The same Comfort Alert board is used across many ICP / Heil / Comfortmaker single-stage condensing units. Verify the OEM number printed on your existing board before ordering.

Installation Guide

Safety First — Disconnect power at the disconnect and breaker, and verify zero voltage with a multimeter.
Access — Remove the condenser control-box service panel.
Document — Photograph every wire and harness plug landing on the board before disconnecting.
Remove — Unplug the connectors, release the standoffs/screws, and lift out the old board.
Install — Seat the new board on its standoffs and reconnect each harness exactly per your photo.
Test — Restore power and confirm the diagnostic LED powers up and the unit operates normally on a cooling call.

Signs You Need a Replacement

No LED activity or diagnostic codes from the module
Compressor won't start with a known-good capacitor and contactor
Persistent false or frozen fault codes
Repeated nuisance compressor lockouts

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 Comfort Alert Control B...

$119.00

Frequently Asked Questions

Does this Control Board fit my Tempstar T4A348GKD100 — Diagnostic Module | Ships Today?

Yes. This is the factory-specified OEM control board for the Tempstar T4A348GKD100 — Diagnostic Module | 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 T4A348GKD100 — Diagnostic Module | 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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