Free help & advice Learn more
Thermo King  |  SKU: 845-2731

845-2731 | Genuine Thermo King® SR4 Precedent Motherboard Controller

$2,92900
Shipping calculated at checkout.
ConditionNew
Express payment options

365-day / 100,000-mile limited warranty on U.S. orders. Return conditions apply. Mandatory legal rights remain unaffected.

365-day / 100,000-mile warrantyU.S. orders · Details › 30-day returnsFrom date received · Details › Free U.S. ground shipping $100+Details › +1 (828) 233-5509Mon–Fri, 8 AM – 8 PM ET

Need a quote?

Need help with fitment or a quote? Include your part number and vehicle details.

Contact our team

A Thermo King SR-4 (Smart Reefer 4) Precedent Refrigeration Unit Motherboard/Controller 845-2731 is the main electronic control board used in a Thermo King Precedent trailer refrigeration system. It acts as the brain of the refrigeration unit, controlling the cooling system and helping maintain the correct temperature inside a refrigerated trailer.

General Specifications

Condition New
Part Number 845-2731, 8452731 
Brand Thermo King
Fits
Thermo King Precedent trailer refrigeration units.
Specifically, SR-4 multi-temperature control systems.

 

Purpose & Function

 

  • Controls cooling operation – Helps manage the refrigeration system.

  • Regulates temperature – Helps maintain the temperature set by the operator.

  • Controls electrical components – Coordinates signals between sensors, fans, compressors, and other components.

  • Monitors system performance – Receives information from sensors and helps detect system problems.

  • Manages system functions – Coordinates refrigeration operation and control settings.


Signs of a Bad Precedent Motherboard Controller

 

  • Refrigeration unit will not start.

  • Cooling system does not work properly.

  • Temperature inside the trailer fluctuates.

  • Controller screen displays alarms or error codes.

  • Unit shuts down unexpectedly.

  • Sensors or other components do not communicate properly.


About Thermo King

Thermo King is a global leader in transport temperature control systems, specializing in refrigeration units for trucks, trailers, buses, rail cars, and shipping containers. Founded in 1938, the brand is renowned for reliable, efficient, and innovative solutions that keep perishable goods at precise temperatures during transport, supporting industries like food, pharmaceuticals, and logistics worldwide.

Bosch Parts

View all