Question about Bosch HME9760 Microwave Oven

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HME9750 error Er4

My microwave is not working anymore. The fuses are ok. On the lowest screen you can hardly read Er4 (in the sun). On the upper screen there is the time, but you can hardly read that too. In the manual it's saying: contact cutomer service. Can i fix it myself?

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The first thing I would suggest is a hard reset. Unplug the unit for a minute or so. Then plug it back in, set the clock and try again.

Let us know if the hard reset does not fix it.

Posted on Aug 18, 2008

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Posted on Jan 02, 2017

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Dead appliance, power on wall outlet.

YOUR SAFETY IS PARAMOUNT!

Attempt this only if you are competent.

If your appliance has absolutely no functions at all, remove it from the mains supply, remove the case and see where the mains lead goes in to the appliance and follow the cable until you find the main fuse.
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If the cook light is working and there is power to the transformer, DON'T try to measure the secodary voltage, most meters do not read that high.
You say the capacitor is OK then there is nothing else but the magnetron to suspect.
Change the magnetron if all else is OK.

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First the microwave clock etc worked but the fan and table and microwave didn't work now nothing works anymore i checked the fuses they are ok the doorswitches work also ok. what is the next step to do


Probably the failure of a high-amperage fuse inside the unit. The electronics are generally separately fused so one section can fail leaving the other functioning.
If there is no external fuseholder on the back panel, it will be necessary to remove the housing to access the innards.
The fuse that has blown may have blown because of metal fatigue but the cause could also be more serious, namely the high voltage diode (or diode bridge) that converts high voltage AC into the DC required for the magnetron or even the magnetron itself may have developed an internal short.
If you locate the fuse, buy two of them and if the first replacement fails again, then the diode(s) or magnetron has failed and with the cost of service plus parts markup, you will be better off replacing the whole unit.

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IF YOU TURN OFF POWER TO APPLIANCE AND WITHDRAW IT ABOUT 4 INCHES FROM HOUSING LOOK AT THE TOP YOU WILL SEE A PANEL WITH 2 SCEWS UNDO THIS TO SHOW BULB UNSCREW REPLACE AND REASSEMBLE.

Oct 19, 2009 | Bosch HME9760 Microwave Oven

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Outlet works but the microwave is dead, no power at all.


I had a similar problem with my Whirlpool microwave. I replaced a fuse (after reading posts in this forum) and it's working again.  I'm not sure how similar your model is, but in my case it was an in-line fuse in a wire leading down from the main fuse in the upper right corner behind the control panel.

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Sienens microwave HFT879 fault


Exactly the same problem over here, but after our house was hit by lightning, so not really surprised about the cause of the problem. If you look closely, you can still see the displays on a very low light level. I can still choose a microwave program, turn the time etc, and see the time changing, but start won't just just work.
m.de.man att zonnet.nl

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Where's the fuse?


Yup, I had the same problem. The unit just stopped working. I gather that this is a common problem with this model. I followed other posts elsewhere, and found the fuse behind and near the top of the control panel. There's a white, cylindrical plastic thing about 1.5-in long in one of the wires that run down from the main fuse in the upper right corner. Pop open the case (you may have to cut a plastic tie around it). I replaced the fuse. My microwave is working now. We'll see how long it lasts.
It's hard to tell what kind of fuse it is, but reading elsewhere, it's a 250V 4A 5x20mm slow-blow fuse.  I haven't found a ceramic one just like came out, but a 4-pack of glass fuses that fit the specs are $3 at Radio Shack. PN 270-1066. (No endorsement implied, it's just where I found something that worked.)

No, the fuse in question (and there appears to be another like it lower behind the control panel) isn't on any of the diagrams or parts lists.

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the sighn with a spoon inside is to alert you to the dangers of delayed boiling this is were the liquid in a container is heated on the outside quicker than the inside when you remove the liquid and expose it to the ambient air in your kitchen the liquid can boil over scalding your hand it doesnt have anything to do with your friends cup of tea this is pure coincidence the pop is the internal safety fuse blowing will need attn from service tech to sort high voltage safety fuse blowing means inverter or mag faults.

Aug 07, 2008 | Bosch HME9760 Microwave Oven

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