Electric Shower issues

[Maynarkh]

The other day my electric shower cut out when I switched it on. Power light is off on the shower and the light on the pull cord isolation switch outside the bathroom is also off.

I checked the MCB, which hadn't tripped and also the fuse in the RCD, which is also ok. Thinking the fault must be with the isolation switch I put in a new one but still no power to the shower. I checked the voltage to the supply side of the isolation switch with a multimeter and it's only showing around 5.5V. What could the problem be?

 

[EFLImpudence]

I checked the MCB, which hadn't tripped and also the fuse in the RCD, which is also ok.

RCDs do not have fuses so what is it that you checked?

Thinking the fault must be with the isolation switch I put in a new one but still no power to the shower. I checked the voltage to the supply side of the isolation switch with a multimeter and it's only showing around 5.5V. What could the problem be?

Presumably a disconnected wire somewhere.

Is the live at the switch 230V to earth?

 

[winston1]

Thinking the fault must be with the isolation switch I put in a new one but still no power to the shower.

Randomly changing items without ascertaining they are faulty is a waste of time and money.

I checked the voltage to the supply side of the isolation switch with a multimeter and it's only showing around 5.5V. What could the problem be?

Next check the voltage at the MCB, and work backwards till you find the problem.

 

[Maynarkh]

Next check the voltage at the MCB, and work backwards till you find the problem.

Voltage here also reading 5.5V.

 

[terryplumb]

What are you using to measure voltages present ?

 

[Maynarkh]

What are you using to measure voltages present ?

A multimeter. Did also check a second MCB to make sure multimeter was working ok and got 230V.

 

[terryplumb]

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Either a duff MCB ,or it's not switched on ! Show us pics of the consumer unit.
What is the " fuse in the RCD" that you refer to ??