If you have a multi meter check for 20ohms resistance between these two prongs with power off. If not element is knackered.
Check across the stat for continuity turning the stat up and down.
Did the plumber replace the whole thing or just the stat?
If you have a multi meter check for 20ohms resistance between these two prongs with power off.
I would hope that you have a lot more than 20 Ohms between Live and Earth!
On the thermostat yes.
The 20ohms related to the resistance through the element. You need to check both.
@Mr_Sworld started
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If you have a multi meter check for 20ohms resistance between these two prongs with power off. If not element is knackered.
Check across the stat for continuity turning the stat up and down.
Did the plumber replace the whole thing or just the stat?