Purchased new in 2008. Have had 3 new magnetron tubes put in up to this point and it just quit heating again yesterday. Seems like same symptoms as before. All covered by extended warranty, until yesterday. They all lasted about 1 1/2 to 2 years. This last one was just replaced 1 year ago. Any idea what would repeatedly cause the magnetron tubes to fail?
Answer Hello Don,
The most likely cause would be the high voltage transformer but without actually testing everything this is a guess. You must first realize that if there is an issue with an electrical circuit that causes excessive current flow, this excessive current flow is present in the entire circuit and any component in the circuit can be a problem. The HV Capacitor and the HV Diode can be at fault also, since they are in the same HV circuit.
when I went to heat up my coffee put it on one minute to heat everything ran as should but coffee was still cold.
You will want to check to make sure that the diode is good, the HV transformer, the magnetron thermal fuse, the magnetron and the capacitor. All of these components can cause the unit to not heat.
I have an older tappan microwave that just quit heating. Everything else works. What part(s) would it need ?
Answer Hello Helen,
You would want to check the diode, the fuse, thermal cut off and the transformer. The magnetron may be bad but these other components can also cause unit to stop heating.