newteam 9.5 reduce temperature light

The reduce temperature light come on water goes cold then reduce temperature light goes out and water goes back to hot could this be the tco
Asked 11 years ago by Brian

I think you may have a faulty Thermal Cut Out (TCO).

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.

(Thefunction of the TCO is, if the water over heats it cuts the power offto 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

Whenfitting a new TCO listen to the shower, after it has completed itsfirst on/off cycle, if when it is switched off you hear it continuing toheat (Noise like a kettle starting to boil) this will mean that thereis a switch or a relay that is stuck in the on position, this is keepingan element energised and this is probably what caused the original TCOto fail.

Ifthis is the case replace the faulty switch or relay and make sure thatyou switch the shower off at the isolating switch when the shower is notin use because this may cause the new TCO to fail.

Answered 11 years ago by Anonymous

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