SOURCE: Presto Heat Dish Blows Circuit
It sounds like the heater is drawing more amps than your fuse is capable of handling. look at the i.d. plate and see what the wattage is for the appliance.
SOURCE: Presto Heat Dish
The hardest part of cleaning the dish is that you can't get your hand inside the cage surrounding the dish. What I did was to use a wire cutter to snip enough pieces of the cage off so that I could get access to the dish. If you do it carefully, it looks as if it was intended and doesn't prevent the cage from working. If you think of the cage/dish as a clock, I cut all the strips between 9 and 11, and 1 and 3. Easy to clean the dish afterwards.
That might not solve the buzzing problem, though. It didn't solve it for me.
SOURCE: presto heaters
We have one in our office where our entry is pretty close to teh main door. It used to buzz all the time after being on for maybe 10 minutes. One day I got sick of it and took a cloth and some windex and cleaned the reflecting dish, and that actually stopped it
SOURCE: Presto Heat Dish buzzer
Well, I had the same problem with my Presto Dishheater buzzing after a few minutes. After reading the post by Smpthcnerd I decided to take a look for myself.
Maybe I've done something terrible, but I think that there's a simple acceptably safe solution. The limit switch (button) at the top of the dish can be shorted by just using a straight metal bit to connect the two wires the enter and exit the limit switch. Just modify a standard electrical connector.
This keeps the tilt alarm alive, but eliminates the false overheat alarms that I was getting after about 5 minutes of operation. The heater thermostat works as normal--just cycles on and off depending on where you set the top dial.
By the way, be careful about how you place the shorted lead assembly. I taped them with good quality electrical tape and rigged them so that they are positioned in a relatively cool location behind the dish. Then I checked it after 15 min of operation to make sure the temp wasn't affecting the new wiring. You don't want the leads to short to the dish housing, needless to say. So be careful about that.
Let me know if I missed something, safety wise. It appears to work like it should, with the tilt alarm intact and the thermostat as well... My problem was a faulty limit switch that was causing the buzzing. Presto doesn't sell repair parts for the HeatDish, so wiring around the fault was the only solution I could think of. If your problem is different, then this approach will not be effective.
Good luck and stay safe.
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