If there is sufficient power supply, the next step is to check:

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What to do if the voltage in an apartment or private house is normal

Correct operation of the high-voltage path. The generation of input signals to the magnetron, and therefore the full heating of the internal part of the microwave, will depend on its serviceability.
The proper functioning of the magnetron itself.
The correctness of the constructed algorithms of control units and their reliability.
No heating of food when microwave is on
This sign indicates an existing malfunction of the magnetron control circuit. The fault may be a failure in the internal design system. The malfunction can also be detected in the voltage supply circuits, which cannot be assessed with the naked eye. The energy supply circuit in the high-voltage path may be disrupted.

Step 1. It is necessary to measure the voltage on the input winding
You should take care of your own safety and disconnect all the wires laos telegram data passing through the transformer terminals. This will stop the automatic power supply to the high-voltage path.

Safe voltage measurements are made immediately before working with a multimeter. This device should be switched to the voltmeter mode, where you can safely work with alternating current, and then measure the required value in volts.

Help! If the reading is zero, it is possible to conclude that there are defects on the blocking contacts side. The problem may also be in the devices transmitting the pulses. By taking measurements in the required sequence, starting from the input filter and ending with the winding, all switching points are checked.

Step 2. All elements that make up the high-voltage path are checked.
This process is quite labor-intensive, since the high-voltage path includes many different electrical components.Each of them must be examined in detail for operability and correctness of actions. In this case, the check is carried out sequentially, from one element to another.