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Does anyone know whats the best pump to use to recharge an expansion vessel, i wanna try that before i replace the PRV in a heatline boiler.

its got to be the supressor, took it out and still not tripped rcd. only found it cos i was flicking the switch on off a few times and started tripping straight away. thats when i removed it and found it was knacked shorting across N E.

bingo, got the fault think its called a supressor, thats why only tripping on the ch. anyone else had this?

I will have a look tmrw and keep you's posted

thanks for the quick reply, i see what you mean about the thermostat. i can see this fault driving me nuts, its an elson tank too. what can cause earth leakage? fault cable's?

Hi all, Got a customer with a horrible fault. The system is a myson housewarmer back boiler, gravity hot water, pumped central heating. randall 3020p timeswitch no room/cylinder stat The problem is the RCD is tripping aswell as 2 3amp fuses blowing. 1 fuse spur and another for the pump...