tco is thermal cutout, its a switch on top of.the heater tank. pressure switch operates when water pressure is sufficient. if ur shower has a pcb then the pressure switch will be located at the bottom edge a plunger strikes the switch when the water pressure is sufficient
garryk
March 2010
why have you started another post ?
is the low pressure light lit ?
have you a multi meter ?
hi-spec plumbing & heating (essex)
February 2010
I can answer this question...
How do I access the following parts for a Triton Zantia ii?