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Can you see a silver flexible pipe attached to the copper pipework?
It sounds like the connection to the pressure switch is blocked, best to drain down strip it out and clean it (unless it is actually faulty)
There should be a reset position on the main control knob, turn to that position and trun back to heating
I will dig out the manual - do you have the GC no. or age of the appliance?
This is the manual;
Page 10 - brown, white and grey wires
Page 26 for the part
ok, its that old!
No it does not have one - there is an overheat thermostat on yours and it is underneath the panel (on the under side)
Try the low pressure switch first.