no hot water
If when you say control box you mean that the light in the isolationswitch is out then it is likely that the switch needs replaced if not then I think you may have a faulty Thermal Cut Out
A faulty TCO will have no continuity across the twoterminals (The black thing on top of the heating tank)
Therefore a good TCO will have power at both connectionsand a faulty TCO will have power at only one.
(The function of the TCO is, if the water over heatsit cuts the power off to the elements)
See Video.
http://www.youtube.com/user/showerdoc#p/u/2/_zi8JbEMYMs
Answered 11 years ago by The Shower Doctor
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