fusebox problems? any ideas?

[dj313]

Boiler immersion heater element packed in, which caused mcb fuse to trip..

The heating immersion element is being replaced; the MCB fuses are fine; but fusebox for boiler section power output is zero, after checking.

Everything else works on fusebox except boiler power output-there are other fuses connected to this- they are ok, power into the mainwire is zero hence no output from fusebox(boiler section). Is this a safety feature hence no power output to boiler? Do i need to call the sparky?

all ideas greatfully received

 

[Qedelec]

You need to check the supply FROM the immersion MCB. It is possible that the MCB is now faulty although if its a decent make it will normally take 6000A breaking current.
If this is ok then start checking thje supply cables to the immersion. You will need at the very least a multimeter to measure voltage and continuity.

Please do not tell us you are using a neon screwdriver to check this circuit.

 

[PartPapproved]

Is this the first time the mcb has tripped? , because as said already they have a breaking capacity of 6ka(most do)but they can often only handle a couple of heavy duty breaks before they fail.

 

[kai]

Have you checked the 13amp fuse inside the fuse-connection unit to the immersion? (The Switched white box beside the immersion, with a small hatch in it for the fuse, and possibly a neon indicator too, supplying the flex to the immersion).