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Do you hear a hum from area behind the red switch? - No there is very little noise coming from boiler. When its working fine it tends to make a bit of noise. Do you hear the fan running? As above, very little noise coming from it all.Have you had the boiler serviced (most I visit have been, but...

Pilot light is on but im not getting full ignition when i turn heating on or put hot water tap on. Pressure is quite hight 2.5 / 3. Have bled radiators in case that helps but no joy. Any advice appreciated.