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When switched on mains fuse blows. Why? - Rancilio Epoca ST

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Could be a bad heater in the boiler.You can isolate by disconnecting wiring and ohming out the element.

Posted on Jan 31, 2011

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Posted on Jan 02, 2017

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Why is the ignition fuse keeps blowing and blowing main fuse


It's called a direct short to ground. Whatever is on those fuses needs to be checked. Main fuse, is it blowing when you turn on key or when you hook battery? If with switch then trace hot wires from switch. Blown fuses are from overheating, which is what a short does.

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Citroen xsara picasso 2.0hdi battery fuse keeps blowing.


If it's the main Fuse, rated above 40Amps, then usually only two components are directly connected to this circuit. The starter motor and the alternator. Both can get critical short to ground, that may blow such fuse.The thick battery cable goes directly to the starter motor and a smaller high amp wire is looped from there to the alternator. Third less likely would be main supply to ignition key switch.

Mar 21, 2014 | 2001 Citroen Xsara

1 Answer

I have a 2005 cavilier..it keeps blowing the main 30amp fuse when the ac is turned on..any help


you need to inspect all AC WIRING, to find the SHORT, thats causing the fuse to blow ! donot put another fuse in until you locate the shorted condition, ( bad connection, frayed wire, bare wire touching metal along this circuit, you might have a bad switch, your ac has two switches under hood, one @ high pressure side and one @ low pressure side. and your main control switch, check all wires & connections

Mar 11, 2013 | 1991 Chevrolet Cavalier

2 Answers

Main fuse keeps blowing


You stated your loadtested battery? Try another known good battery as I have seen very odd things happen with these maintainence free batterys sometimes such as polarity swapping. This would cause the same main fuse blowing as if you were hooking the battery up backwards.Then begin by un plugging the ignition switch. If fuse blowing stops the problem is in the harness somewhere between the fuse and ign. switch. Possible wire pinched or rubbed through and grounding. From the ignition switch the main fuse voltage goes to the distribution(common) side of the fuse box. Inspect the wiring from the switch to the fuse box. This problem has to be pre fuse box in location otherwise the lower amperage circuit fuse in the box would be blowing. Good luck!

Dec 30, 2012 | 2007 Suzuki GSX-R 600

1 Answer

Exactly what can blow the main fuse


Hi, Anonymous you have a dead short which is usually the easiest to find. Using a test light connected to the hot side of the blown fuse holder, start probing the wire leaving the fuse holder about an inch away the test light should illuminate, keep probing towards the ignition switch until the test light no longer illuminates you are now very close to the short. For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
Main Fuse Blows The FZR Forum
View topic 92 FZR600 Keeps Blowing Main Fuse
https://www.tradebit.com/filedetail.php/2864660-yamaha-fzr-600-service-repair-manual-pdf
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-fz-owners-manuals

Apr 24, 2012 | 1991 Yamaha FZR 600

1 Answer

Why does brake light fuse blows instantly 1995 contour


sounds like a wiring problem or short,check with tester.if wiring is alright check your brake switch normally on or near the brake pedal as this can be defective.

Dec 02, 2011 | 1995 Ford Contour

2 Answers

Hotpoint Dishwasher BF1620 blew the main fuse circuit in fuse box during mid cycle wash? Re-set main power fuse circuit but now as soon as Dishwasher switched on immediately blows main kitchen power fuse...


This is happening because you have a very bad fault, a Phase to Earth short, problem. Leave machine UNPLUGGED, Breaker/Fuses OUT. do NOT use it, nor Touch it, It is possible to get severe electric shock. PLEASE get a registered serviceman to inspect this unit.

Feb 07, 2010 | Hotpoint 23 in. BFI62 Built-in Dishwasher

1 Answer

Kawasai z750, keeps blowing main fuse


Hi,

To my knowledge, there are no onboard electrical/electronic components capable of shorting and blowing the fuse with out blowing any of the secondary fuse. The main fuse could possibly blow due to a short in the wiring or an exposed/frayed wire touching the body. The three most likely areas would be:
  • wire harness leading to the regulator;
  • wire harness leading to the fusebox; and/or
  • wire harness leading to the ignition switch.
Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Nov 19, 2008 | 2005 kawasaki EL 125 Eliminator

1 Answer

Blown Mains Fuse


You should repleace the old transformer with the new one

Jun 13, 2008 | NAD C370 2-Channel Amplifier

2 Answers

Main fuse blown on CT-32G11 32" Panasonic TV, Replacement fuses continue to blow.


If the main fuse keeps blowing, check the horizontal output transistor for a shorted condition and diodes in that section as well.

Jan 12, 2008 | Panasonic CT-32G11 32" TV

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