TCO failure

My TCO switch failed (tested using a continuity test), got a new switch and successfully replaced & shower working - for now. BUT - why did it fail in the first place? What are possible root-causes? I'm on tenterhooks waiting for it to fail again!
Asked 11 years ago by Craig

Sometimes they just fail!

 

However the most common cause is a switch sticking in the onposition.....See below

 

 

After fitting a new TCO

 

When fitting a new TCO listen to the shower, after it hascompleted its first on/off cycle, if when it is switched off you hear itcontinuing to heat (Noise like a kettle starting to boil) this will mean thatthere is 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 TCO to fail.

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

 

 

 

Answered 11 years ago by The Shower Doctor

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