Potterton Puma 80e noise

[harmonia]

Occasionally noting that our combi boiling sounds like somebody is bashing a hammer around inside it. This happens 3-4 times a day but it is apparently working ok supplying us with central heating (5 rads) and hot showers. It has been corgi serviced 3 weeks ago but twice recently the lockout light has come on so I have had to reset it. We have the CH turned on constantly since the weather turned cold and I was wondering weather turning it off for short periods would help?

Should these noises concern me - any suggestions appreciated thx.

 

[ollski]

check the pressure on the gauge underneath the boiler on the right hand side, then probably think about the pump.

 

[harmonia]

Thanks, do you mean the filling loop gauge for the central heating. I took a look and it was at about 1.4 bar (black arm) so I increased the pressure to 1.8 (same as the red guide arm). I have also recently tested all the rads for bleeding but there were all tip top.

If it is the pump do you mean the pump the push the water flow around the central heating circuit?