Heat the micro temp unit has failed,wher can i buy a new one?

It could be low on Freon, could be siezed, could be bad commutator, bad capacitor.

The fuel gage is most likely the fuel level sending unit inside the fuel tank, the temp could be wiring or the temp sending unit on the engine, try that first.

usually when you kill the power and then when you put power back on the machine works it's the computer board that's bad.all you're doing is resetting the board just like your house computer,if something happens to it you shut it down and reboot it,that's what you're doing with the micro wave just rebooting the board.here's the funny thing about micro waves sometimes the part you're gonna change is almost the same price as a new micro wave so i would first check how much the board is,i went on sears and they have the board for 115.00 repair clinic for 235 part number WPW10216347 they don't make this model anymore but you can get a stainless micro for around 290 to 300 dollars and if you buy the same brand all you should have to do is remove the bolts up above that hold it in place and remove the micro wave and the same brand should mount the same way so you won't have to drill new holes or replace the back metal panel.if i were you i would replace the unit instead of the board repair clinic shows most of the parts for this model out of stock so it might be a while before you can get any parts for this model but this is up to you.good luck with your micro wave.one more thing when you were in there did you see alot of grease,this is usually the cause of no heat,the grease from cooking on the stove top gets into the micro wave and on the mag tube and damages it,if there was grease in there i would just replace the unit

sounds like magnatron has failed...............cheaper to buy new micro...........sorry
cheers

This is normal. It will only turn on when the temperature set is below the ambient temperature in the area around the thermostat.

Your problem may be the location of the thermostat is not ideal form the areas you are heating. this usually cause the temperature in areas vary from the thermostat to the point wher relocation of the thermostat is sometimes the best resolution.
this is often the case wher ther are multiple heating zines in a building, and one or more zones interfere with the thermostat of others,

but it also happen in single zone heating systems too.

I would start with your outdoor thermostat located in
the unit outside. I`m assuming this is a heat pump.
When the outdoor temthermostat is set to say 40F
anything lower than that and you are not using the
compressor, you are using electric heat thats located
in the air handler unit in the house.

I`m also assuming this is a split system and not a
packaged unit. If you are mechanically inclined and
you can locate the outdoor thermostat lower it below
the outdoor air temp and see if the unit comes on.

Sounds like you might have a problem with your electric heat or emergency heat

If you want to order a touch pad, (it has the micro computer built in it!) and fix it that way, you'll still have a 2-3 year old machine.
I would say it would be quicker and cheaper to buy a new one.

having found a circuit diagram, realised that the divertor valve was electrically operated.i unplugged this then unclipped the motor from the valve body,the diverter valve is spring loaded and once i'd removed the motor the spring raised the valve to divert water through the dhw heat exchanger,giving us hot water but no heating, if i refit the motor the problem comes back heating no dhw.ordered new motorised valve assembly £30 next day order .
this was a simple fix without having to drain the system down.

if micro. new then its defective
if micro. old then you need replacement or service the heating element and turn table motor

I also have a Dell 8400 heat problem . I know the problem ! I own a $1000.00 plus Raytek laser temp gun . I had some problems and started to read about all of the Dell 8400/4400 over heating problems . I out my new heat gun and started to test the temps. on the inside of my Dell 8400 ! Socket 775,Mobo Dell 0J3492,800 Bus,Bios A09.

The non-fan Radeon x300 card was 105-115.3 F after one hour !
The heat sinks over the chipset was the big problem . 107.8-124.6f after just one hour! The P4 cpu was 93-104f .
I am very lucky to have the laser temp gun I have .

The fix . I have all kinds of old fans and hard drive coolers from computers I have trashed over the years . I got new 40mm/10mm fans on the way from the bay . I had to use some old worn out fans 40mm fans to hold me over .I ordered a new video card also . THEY WORKED ! My temps dropped down to 82-85f on the chip set and video card after running the fans

I hope this helps .