[Ralf]

microwave turns on and everything works except it doesn't heat up the food. Anyone knows what the problem might be and if this can be repaired?

[PS Staff - Sheila]

It is either the magnetron or the transformer.

This can be fixed but it should be done by a qualified technician.

Here is a link to your microwave model JVM1870.

For a more detailed breakdown of your microwave you will need the last part of your model number.