Question about Presto HeatDish Compact Heater
I've heard some mention, here, about somehow by-passing the buzzer mechanism. After my dish heater has been on for maybe 10 minutes, it starts buzzing (as though you tipped it over). I turn the heat down, and it'll eventually buzz again. How exactly do you bypass the buzzing mechanism? Right at this moment, I have my heat dish apart on the floor in the den and can't figure out which part the buzzer is! LOL
Thanks for any help!
I have no doubt that a previous post meant well with the suggestion to remove and bypass the tilt (or "tip") switch but this a very dangerous thing to do. It costs the manufacturer money to incorporate these safety features. It cuts their profit margin so believe me they wouldn't include them if it wasn't absolutely necessary. To eliminate this switch would disable the unit's capability to not only warn you with the buzzer of an upset condition but also ensure that the element will stay on when lying on it's side on the floor!! The only way the heater "knows" that it has been tipped is from this switch opening up and splicing it's wires directly together will forever prevent the detection of an upset heater. If you fall asleep with the unit on and the pooch brushes past it, knocking it over, it will lie on your nice carpet or wood floor silently cooking anything it touches and the alarm won't sound even when you need it. Don't set yourself up for an easy fire.
The buzzer is wired in series with the heating element (coil) and without the two safety switches it would stay on forever (the round button-like devce at the top of the reflector dish is a temperature high limit switch there to prevent a runaway heat condition). These two switches actually short circiut the buzzer so current will flow only through the heater element under normal operation but if either switch opens current can now flow to the alarm buzzer as well. Since the buzzer adds a lot of resistance to the coil/buzzer path it severely reduces the available shared current to the point where the coil won't heat up but since the buzzer only needs a fraction of what the coil does, it sounds off.
Incidently, that high temperature switch can be tripped off (turning on the buzzer) by a dirty reflector because the dirt or crud spilled on the dish prevents full reflection of the developed heat, dramatically increasing the temperature near the limit switch (as a white surface under the sun reflects heat while a black surface absorbs it). It usually takes a few minutes for this to happen. When the switch resets the cycle repeats. However if the alarm sounds immediately for no apparent reason at start up, either switch or the associated wiring will be open circiut.
Many electrical devices that I have serviced have different sized connectors to prevent mixing up their positions when reassembling but these units use identical sized spade terminals so make sure you note their original locations before pulling them off. Transposed wires may appear normal but cause many and varied new problems. Wires normally are routed to avoid strain so if one looks like it is stretching too hard to reach it's terminal it's probably in the wrong spot.
Posted on Feb 20, 2009
For those of you that want to void your warranty or just dont care there is a fix for the buzzer problem.
If you take the three screwws in the back and the one in the top next to the heat selector switch the steel dish portion will come away from the dish back. located on the bottem of the back inside panel there is a small disk looking tilt switch that has one red wire on one end and on the other a white and two black wires. remove this component and all wires from it. take all the wires from it and remove the ends exposing solid wire. for this modification you will need a philips driver wire stripper and cutter and one medium size wire nut available at almost any hardware store. take all the loose wires and wrap them together and place the wire nut on them. be sure to tuck the wire someplace away from the dish portion when going back together. put the unit back together and plug it in and "presto" you have no anoying buzzer anymore and the heater wont go on and off like it used to. this seems to be a comen problem due to lack of insulation and poor design on heatdishes part. hope this solved your problem
Posted on Dec 25, 2008
I already fixed my buzzer issue. I took the heat dish apart and when i didnt see the red wires i started looking at the different little boxes. one box had 2 white wires going to it. i took the manufacture name off the box and googled it and found that it was the buzzer. i actually found a pic on the internet that was the buzzer. i disconnected the little black box that had 2 wires on it and now my buzzer doesnt go off. but on the high setting it still turns off for 5 minutes after being on for 10 but no buzzer. on the med setting it doesnt cut off it just dims down.
Posted on Feb 20, 2009
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.
Posted on Dec 06, 2009
I knew that I would not want to remove the alarm because of the intended purpose of notifying me if it was tipped over.
I wanted to see if dust or dirt could be triggering the alarm to go off. I removed the the screws and opened up the back. I located the alarm towards the bottom left side. I wiped and cleaned the whole inside surface in the back and then got out the vacuum and vacuumed around the alarm. I also used the long thin vacuum hose attachment and vacuumed the front heat coils'.Their is no need to cut the metal frame in the front of the unit to reach the coils. The heater works like a champ again.
Posted on Jan 28, 2016
I put a wet paper towel and used a pen to move around the towel in the dish and cleaned all dirt; now it's nice and quiet!
Posted on Dec 17, 2012
I put a fan on the lowest setting, place it right next to the temp control pointing the fan so that it blows as much away from the heat dish as possible. For my own added security I place a fire alarm on top of the box fan I use. Or place it some where I can predict the smoke to go first . Something else I have used is an auto timer at the plug in. Set it to turn off every 30 min. And back on. It's not a complete solution but it does work. What ever solution you choose I wouldn't leave the dish on when I'm not home or even unattended is risky if you ask me
Posted on Dec 27, 2011
My dish does the same thing, I just turn the knob to "off" every 6 minutes and turn it back up a second later. that way it cools down and doesn't give you a heart attack.
it's not a complete fix, but at least it doesn't involve taking the thing apart!
Posted on Feb 08, 2010
a 6ya Repairman can help you resolve that issue over the phone in a minute or two.
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Posted on Jan 02, 2017
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