Lg Microwave LMHM2017ST Won't start or doesn't start

The Time Delay Fuse is an OEM part for LG microwaves. This fuse provides a safety mechanism by delaying the flow of electricity, protecting the microwave's electrical components from power surges and ensuring the appliance operates safely. It helps to prevent immediate damage in the event of a power surge or electrical fault, thus prolonging the lifespan of the microwave.

Over time, the time delay fuse can become damaged due to electrical surges, wear and tear, or faulty connections. If the fuse blows, it can disrupt the microwave’s ability to function correctly.

Symptoms of a bad time delay fuse include:

• The microwave not turning on
• No response from the microwave control panel
• The microwave stopping unexpectedly during operation
• Electrical issues or blown circuits in the microwave

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

This time delay fuse protects the appliance from overheating by opening the circuit when temperatures exceed safe limits. It's a direct-replacement electrical safety fuse used in heating circuits to help prevent damage and fire risk. What it does:

• Opens the circuit when the detected temperature rises above safe operating limits to stop the heating element
• Helps prevent overheating-related damage to internal components and wiring
• Can cause intermittent or no heating when failed
• Commonly associated with symptoms such as no heat, reduced or inconsistent heating, or a unit that stops running during heating cycles

• Disconnect power to the appliance before accessing or replacing the fuse to avoid electrical shock
• Locate the fuse according to your appliance's service manual or diagram and replace with the exact part number
• If the fuse is blown, inspect heating element, thermostat/thermal cutouts, and venting for underlying faults before reinstalling

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. 

This temperature-sensing safety switch monitors heat inside the microwave and opens or closes its circuit at a set point. Replacing a failed thermostat helps protect the unit from overheating and restores proper fan or heating control. What it does:

• Monitors surface temperature where it is mounted (cavity, duct, or component)
• Opens/closes its electrical circuit at a specific threshold to prevent overheating
• Can interrupt power to heating components or signal the exhaust fan, depending on design
• Symptoms can include: unit shuts off until it cools, runs but won't heat, exhaust fan won't auto-cycle or runs constantly

• Unplug the microwave; if over-the-range, remove it safely from the cabinet
• Discharge the high-voltage capacitor before servicing
• Note wire positions and transfer one lead at a time; ensure tight connections
• Mount firmly and flush to the original location/bracket for proper thermal contact