Lg Range LRE30451ST003 Won't start or doesn't start

The Magnetron Thermostat is an OEM part for LG microwaves and built-in ranges. Its primary function is to monitor the temperature and ensure that it remains within a safe operating range. If the temperature exceeds the preset limit, the thermostat will interrupt the power supply to the magnetron, preventing overheating and potential damage.

Causes of a faulty magnetron thermostat can include electrical malfunctions, component failures, or physical damage. These factors can result in issues such as erratic heating, microwave not heating properly, or the appliance shutting off unexpectedly.

Symptoms of a bad magnetron thermostat may include:

• Microwave not heating food evenly or at all
• Inconsistent or weak heating performance
• Microwave shutting off or displaying error codes related to temperature issues

This OEM LG part can also be used on Kenmore/Sears appliances. 

The PCB Assembly is an OEM component for LG ranges. It is the circuit board responsible for controlling critical range functions such as the oven, cooking elements, and display. 

Symptoms of a bad PCB assembly can include: 

• Range elements not working properly 
• Display malfunctions or failures 
• Improper functioning of oven features like bake, broil, and convection modes 

Causes of a bad circuit board tend to be normal wear and tear over time from heavy usage and heat exposure during cooking. Occasional power surges or fluctuations can also potentially cause circuit damage. 

This OEM LG part is also compatible with Sears/Kenmore.

Replacement sub printed circuit board that restores the appliance's electronic control functions by processing and routing signals between the user interface and other control modules, helping address unresponsive controls and erratic operation. What it does:

• Processes and routes control signals between the user interface and main control modules.
• Replaces a failed sub control board that can cause unresponsive buttons, blank or flickering displays, or intermittent operation.
• Can resolve specific feature failures or error codes tied to the sub board circuitry.
• Provides a direct OEM-design replacement to restore proper electronic control when the original board is faulty.

• Disconnect power to the appliance before accessing electrical components.
• Document or photograph connector locations before removal to ensure correct reassembly.
• Handle the board by the edges and use proper ESD precautions to avoid damage.