What are the specs for this Control Board?

The correct replacement for Tempstar model TCH448AKA1 — 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 TCH448AKA1 — 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 TCH448AKA1 — Heat Pump | Ships Today

Name: Tempstar Defrost Control Board for TCH448AKA1 — Heat Pump | Ships Today
Brand: Tempstar
SKU: 1086070-GEN
Price: 164.95 USD
Availability: InStock

SKU: 1086070-GEN Brand: Tempstar

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Overview

This OEM defrost control board (Tempstar part number 1086070) is the brain of the defrost cycle on the TCH448AKA1 heat pump. In heating mode, frost builds on the outdoor coil; the defrost board monitors coil temperature and run time, then commands the unit into a defrost cycle — reversing the valve, stopping the outdoor fan, and energizing auxiliary heat as needed — until the coil clears. When this board fails, the heat pump can ice over solid, run an endless or non-existent defrost cycle, lose heating capacity, or fail to switch between heating and cooling. Because defrost logic is model-specific, installing the correct OEM board restores proper, factory-timed defrost operation.

Specifications

Spec	Value
Part Number	1086070
Type	Defrost Control Board
Brand	Tempstar (ICP / Heil)
Control Voltage	24V
Application	Heat Pump Defrost Cycle
Fitment	OEM

Compatibility

Designed for the Tempstar TCH448AKA1 heat pump and shared across ICP-family heat pumps (Tempstar, Heil, Comfortmaker, ICP) that call for OEM part 1086070. Confirm the printed board number and connector layout against your existing board before ordering.

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/service panel to reach the board.
Document — Photograph every harness, sensor, and terminal connection before disconnecting.
Remove — Unplug each connector, release the board's standoffs or screws, and lift it out.
Install — Mount the new defrost board and reconnect every harness and sensor exactly per your photo.
Test — Restore power, confirm normal heating operation, and verify the unit initiates and terminates a defrost cycle correctly.

Signs You Need a Replacement

Outdoor coil ices over and never clears
Unit stuck in continuous defrost or never defrosts
No heating, or no switching between heat and cool
Visible scorching, corrosion, or burnt traces 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...

$164.95

Frequently Asked Questions

Does this Control Board fit my Tempstar TCH448AKA1 — Heat Pump | Ships Today?

Yes. This is the factory-specified OEM control board for the Tempstar TCH448AKA1 — 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 TCH448AKA1 — 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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