Triton shower pressure relief valve

I have a Triton Aquatronic 2 Ultra electric shower where the pressure relief valve has operated.
I can see that the device can be removed from the shower and is listed as a replaceable part.
It may be a bit of a hassle to remove unless I can find my right angled screwdrivers so before I dismantle it can the valve be reset or does it have to be replaced?
Currently with the shower hose removed (removing any restrictions) and the shower running without heating the pressure relief is still open.
(And before anyone advises, yes the shower is now electrically isolated both by the pull switch being off and the dedicated MCB in the consumer unit switched off)
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Is the heating tank choked with limescale?
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Andrew Gabriel
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I dunno about this particular model, but on another Triton Shower I've had, the pressure relief valve was non-resettable. IIRC it is a small nylon fitting with a rubber?? insert, which either melts or gets blown out in case the pressure gets too high.
Triton charge an arm and a leg for spares, irritatingly.
I think lack of regular descaling of the shower head caused the problem with ours.
HTH Jon
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On 05/08/2012 12:50, The Night Tripper wrote:

It appears that in all Triton electric showers that the pressure relief device is simple a plastic fitting with a hole on the middle. Into this hole is fitted a very small hard plastic ball. If there is excessive pressure the ball is pushed through the hole and it exits via the output tube and down the bath plughole never to be seen again :)
The whole assembly can be replaced in around 10 minutes and costs 8/10. There is no need to turn off the water.
I opted for buying 3 replacement balls from an Ebay seller for around a fiver. The ball take seconds to fit into the old fitting (once removed from the shower). I then de-scaled the shower head.
Everything is back up and working.
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