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keep getting F0 fault on my jaguar boiler but pressure is ok if i try to charge the system it suddenly jumps to 3-4 bar have changed pressure switch but still have same problem has anyone got any idea's.

Have a micron glow worm boiler which stopped working fault finding chart does not match board fitted board fitted has 2 led's only. Start boiler fan starts then both grn LED's flash and fan stops and lights just continue to flash have fitted recon board at cost £60 and same problem help before...