Lost heat on mid and high settings

My shower works fine on the coolest setting, gives nothing on the mid setting, no LED either, then on the high setting I get the same temp as on low. I have checked the elements, I get 13 and 16 ohms. So I guess it is in the switches. I can't make any sense of continuity test on different settings. I suspect it is the higher power switch not working but can't prove it to myself, could it be anything else? I get continuity on the high switch when only the lower switch is on.
Asked 9 years ago by Anonymous

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.

(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

Answered 9 years ago by Anonymous

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