Shower only producing cold water

I have a 1080GSI and it has just stopped producing hot water. The water is stone cold but still comes out at the same flow as before. The flow also reduces as you turn the heat up on the shower but the water is still cold. The reduce temperature light is permently lit on the shower and this only normally happens when the water is too hot.



Any advice on how to fix this or what part is needed?
Asked 12 years ago by Anonymous

I think you may have a faulty Thermal Cut Out


A faulty TCO will have no continuity across the two terminals (The black thing on top of the heating tank)

Therefore a good TCO will have power at both connections and a faulty TCO will have power at only one.

(The function of the TCO is, if the water over heats it cuts the power off to the elements until the water cools, this can take up to 15mins)

See Video.

http://www.youtube.com/user/showerdoc#p/u/2/_zi8JbEMYMs

 

After fitting a new TCO

 

When fitting a new TCO listen to the shower, after it has completed its first on/off cycle, if when it is switched off you hear it continuing to heat (Noise like a kettle starting to boil) this will mean that there is a switch or a relay that is stuck in the on position, this is keeping an element energised and this is probably what caused the original TCO to fail.

If this is the case replace the faulty switch or relay and make sure that you switch the shower off at the isolating switch when the shower is not in use because this may cause the new TCO to fail.

Answered 12 years ago by Anonymous

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