Stuart wrote:

Re my previous post about my Immersion heater failing to heat and my getting the
wrong item from www.bes.co.uk.which they have now replaced letting me keep the
"wrong" item . I replaced the thermostat from it in to the exisiting immerser
which I thought was the problem but still the water didn't heat so I have just
installed the replacement immerser I got today and it appears to be working fine
.. .
I now have the old immersion heater sans thermostat which I binned .I also have
the other immerser with thermostat .

Is there a way of testing immersers/thermostats other than fiting them and
seeing if they work ( if they do not you still have the problem of knowing if it
is the thermo or the heater that is faulty)

Someone mentioned using a multimeter but can someone explain exactly how you do
that please .I'd like to know out of interest if for no other reason .
thx
Stuart

Immersion heater: test resistance between the 2 mains Terminals, and
from terminals to Casing. T-C should be open circuit, any significant
conductoin and its liable to blow fuses or rcd. T-T should be 20 ohms
for a 3kW element, higher for lower power elements. If R is much higher
its faulty.

Thermostat: the 2 terminals should be shorted at room temp, and should
go open when probe stuck into boiling water.


NT