As you have access to a DVM, you could check each immersion heater itself.
They should about 20 Ohms resistance if it is a 3kWatt device. MAKE SURE THE
CIRCUIT IS DEAD FIRST.

If you can get to the top outlet of the immersion cylinder check the
temperature there. The copper should get to water temperature quite quickly.


With both cylinders in a luke warm condition, turn the setting dial from one
end to the other. You should hear a click as they open and close.

Measure the depth of the thermostat tube with a pice of stiff wire or thin
wooden dowel. If the immersion is fitted in the top of the cylinder the
thermostat tubes with be quite long, If they are fitted further down and
across the cylinder they will be quite short 7" or so.

Chris.


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