On 01/06/2011 23:10, Grumps wrote:


How do I test the boiler stat? If the boiler is hot and I turn the stat to
min, it still runs. Is that a good indicator of a faulty stat?


Yes - either that or a wiring fault which is effectively short
circuiting the stat.

To test it properly you need to remove it from the boiler (pull the bulb
at the end of the copper capilliary tube out of its pocket in the heat
exchanger, and disconnect the wires (making a careful note of the
connections!).

You then need to dunk the bulb in an old saucepan of water on a gas or
electric hob so that you can vary the water temperature - and,
preferably, also measure it with a mercury in glass thermometer - and
check whether the electrical contacts open and close when you would
expect them to for various knob settings.
--
Cheers,
Roger
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