Alternating H&C with L/pressure light

My T100xr shower is alternating between hot and then cold with the low pressure lamp lighting at the same time. Main flow is fine as per your checks, filter not blocked, I cleaned out lots of crud from heater tank with descaler, TCO is fine, changed solenoid/valve assembly about a year ago & is functioning fine. Could the problem be with the tank or the pcb as when I turn on a cold tap this does not cause the low pressure to light?

Many thanks!
Asked 10 years ago by Anonymous

Forgetting about the temperature, turn the showerfrom fully hot to fully cold. At fully hot you should have not much more than adribble coming from the hose, and on fully cold you should have a good strongflow. If you do not have this difference then you may have a faultyflow/stabilizer valve.

Answered 10 years ago by Anonymous

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