Proline Door Switch Circuit Error

Microwave shows F4 and will not start; sometimes occurs after a door slam or impact.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Failed primary or secondary door switch, Loose door switch wiring, Misaligned door latch, Broken switch actuator

Safety first: Unplug the microwave. Do not bypass door switches.

User-level checks:

Inspect the door latch hooks for visible damage.
Open and close the door firmly but gently several times to see if the error clears.
If the error changes when you press or lift the door, the switches or latch are misaligned or faulty.

Next steps:

A technician should access the door switch assembly, test each switch with a multimeter, and replace any defective components.

Hard 4/5

Door Switch Kit

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