Immersion Tripping After New Element

[Arussell87]

Hi all,

I have looked all through the forum but do not see any issues the same as mine and I am just losing the will to live

I have no Gas in the property so we have an Immersion tank on a Modern Digital Timer. Had issues in the past and replaced the element and problem solved.

This time however the Immersion keeps tripping the MCB.

I have installed a new Heating Element and Thermostat and Wiring from the Immersion set up to the Timer using 1.5 Heat Resistant Cable.

I have tested the Element across the terminals and against the tank. I have not however checked with a meter that can push high voltage.

It only trips when the element is on. If the timer box is powered up but not in boost or on mode it does not trip.

Once the element starts up it takes 10-15 minutes for the MCB to trip. The heater is on its own circuit.

Any suggestions?

Many Thanks

 

[Johntheo5]

Are you sure its the MCB its tripping and not the RCD or a RCBO, if its the MCB what is its rating.

 

[Arussell87]

Hey John to be honest I tried to sound smarter than I am. So I have a heater trip then sockets trip then a red trip. The heater and socket ones are smaller on the board and to the left of the one labelled RCD.

 

[Johntheo5]

OK, so what's tripping, is it the (a) RCD, if not, which one is tripping, post a close up photo of your board showing the one that's tripping.

 

[ericmark]

In the main immersion heaters cause the RCD or RCBO to trip due to earth leakage, which is caused either by the immersion corroding or the seals failing, either way only cure is new immersion heater.

Other faults are the thermostat failing, but that will rarely cause anything to trip.

There are three tools used to test for earth leakage faults this one tests the trip, this one tests the element when the trip will not hold in, and this one tests the leakage when it will hold in, looking at around £70, £35, and £35 for testers, so we tend as DIY not to test but just change the immersion heater because the testers cost so much.