Question about Presto HeatDish Compact Heater

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My presto heat dish only puts out a little heat, even on the highest setting. Then other times it puts out full heat. But seems to be operating on the lesser heat more often. I have only used it one season. Any advise?

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  • 56 Answers

Check out some of my other posts regaurding rewiring the unit as this is most likely a burnt wire or bad contact at the selector switch.

Posted on Dec 27, 2008

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Posted on Jan 02, 2017

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My presto heat dish doesn't emit enough heat anymore, even though it's only 4 months old. What do I do?


Go to the Presto website and email them. They are really helpful.

http://www.gopresto.com/information/feedback.php

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Sharp MW won't shut off


Sounds like it needs a new electronic board or PCB. Although I would consider a new microwave as your microwave is getting on in age and can be a danger to health or dangerous if something blows up.

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Burned Thermostaticaly Controled Switch


Presto Customer Service [contact@gopresto.com]

no repairs, however you do have a full year warranty. Just return it to Costco and they will exchange it for you.

Linda
NPI Customer Service

Shipments made to U.S. or Canada only

(original message)
I bought a Presto Heat Dish at Costco (Calgary) and not even a year later the control switch's filament burned out. can you send a replacement switch or provide me with a local supplier so I can return the defective unit and repair it myself?


Thanks!


Koby

Dec 07, 2008 | Presto HeatDish Compact Heater

11 Answers

Presto Heat Dish buzzer


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.

Nov 10, 2008 | Presto HeatDish Compact Heater

1 Answer

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This heater must be flat on the floor or it will buzz, and the metal dish must be clean or it will transfer heat to the safety device. If this does not solve the problem call customer service at 800-877-0441.

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7 Answers

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The switch inside is a thin piece of metal that flexes as it gets warmer / colder towards a pin that conducts power. This pin is rotated towards and away from the thin piece of metal as you rotate the dial counter clockwise / clockwise. The thin piece of metal glows when in use as resistance to electricity running through it causes it to heat up. You have seen this through the vent slats under the dial on the back of the unit. The resistance the thin piece of metal provides causes the electricity usage to be lower and the reason the unit has an 800w to 1500w power rating. The thin piece of metal is failing. You can have the heater FULL power but that is blowing lots of $$ in electric and you may not need all that heat. In the end the thin piece of metal will FAIL so the heater will no longer turn on at any setting. You can bypass the switch since the heating element and everything else is still in good working order and have a heater that works on 'high' all the time when that happens. You CANNOT order just a new switch, which would take anyone less than 5 minutes install. I thought the switch design was ingenious but poor quality metal even though it is a fraction of an oz in weight (since it is so small they SHOULD HAVE used better quality metal, it would have cost next to nothing extra) is most likely the culprit here. It is sad that the Presto Heatdish has to go to the landfill due to such a simple materials error. You will see how to bypass the switch though so it is on 'full and full time'. Maybe purchase a high wattage timer for it so you can set it to turn on in the evenings and mornings for a specified amount of time? Some good timers are around $7. Stan Horstman

Feb 03, 2007 | Presto HeatDish Compact Heater

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