What would cause low voltage transformer to overheat?

The only thing that would cause this is something in the circuit is pulling too much electricity through that transformer. So what is the transformer hooked to? Please post the make and model

What is happening is that the magnetron is shorted, causing the high voltage transformer to overheat. That is what you are smelling is the insulation getting hot. When the magnetron shorts out, it makes a loud buzzing sound. Replacement magnetrons costs almost as much as a new oven so it rarely makes sense to fix.

That noise you hear is loose laminations in the standby/controll transformer. It is no more than a nuisance.
The transformer can be replaced by contacting the manufacturer and browsing for a dealer near you.
Hope that helps.

The switch has gon bad on you. You need to replace the dimmer switch

Hi and welcome to FixYa I am Kelly. Your red LED is telling you that it was 1. overloaded. 2. has low voltage 3. overheated or 4. short in the powered circuit.

OVERLOAD LED (red): Lights up if the generator experiences
a load greater than the rated output, low voltage, overheats or
the powered circuit experiences a short. The output is stopped
even though the engine keeps running.

I do not know which of the 4 conditions caused your red light. If you have the read light with no load I would suspect low voltage from the generator / inverter. If it overheated you will also get the Red LED with no load.

Thanks for choosing FixYa.

Kelly

Hi, relays will also buzz causing units to loose transformers, I have seen this in the past years also. A 2-stage heat-pump stat? I would remove the front to expose the wiring terminals and pull the hot wire red, 24 volts and that should kill the buzz. If so, the circuitry is going out and you will need a new thermostat. I would, if you have a volt meter check the incoming voltage to the stat to make sure it doesn't exceed the proper voltage rated on the cover. Max would be 30 volts ac. If its over that, the transformer is putting out to much on the secondary side and should be replaced, or it will eventually take all of the low voltage controls out. Try removing the 24 volt hot wire and also if you have a friend that has a meter or you do, check the voltage coming in to the stat. Get back to me if it exceeds the rating, as this will cause the buzzing. It may just be faulty contacts in this stat also. I wish you the best, and ask that you are kind when rating me in helping you. Please keep me posted if you need my help.
Sincerely,
Shastalaker7
A/C Heating & Refrigeration Contractor.

Without power to the unit no sound should be generated. Make sure there are no other connections.

MAYBE you have a wall transformer behind it that is buzzing. MANY wall transformers develop buzz.

Another source is flourescent lights and even some of the low voltage halogens have noisy transformers in the base.

Sounds like a loose connection. If they all fo out, it's at the beginning of the circuit. Check all connections at the start of circuit.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

Replacing a flyback is not something I would suggest for anyone with no electronics experience. Second, lets see where the noise is coming from first. Take off the back and listen to the noise. The flyback will be at one end of the large red wires that go to the tubes. Sometimes the connection at the tube is not 100% and the noise comes from there. BE CAREFUL - there are high voltages going through this red wire that can be dangerous even with the set UNPLUGGED!! IF the noise is coming from the connection at the tube, with the set unplugged, carefully turn the rubber cap back and forth touching only the rubber part with one hand. Put the other hand in you pocket while doing this.

If the noise comes from the flyback side, if you can solder, again with the set unplugged, try resoldering the pins on the transformers. That may resolve the problem.

Keep me posted.
Dan

ok i just opened mine up on counter and found that the white wire on the high voltage transformer had been loose and melted so i put a new female spade connector on and it works fine. i suspect that from a year of use and humm from transformer had loosen it and gotten hot thus loosing connection and getting dirty causing it to overheat and burn off plastic sheilding. easy fix!!!