Vaillant boiler noise after British Gas visit

Thanks John.g. I will check the start up time when I return home later and report back. Unfortunately, there is no ABV installed on the system. I will also turn up the pump speed.
 
Thanks John.g. I will check the start up time when I return home later and report back. Unfortunately, there is no ABV installed on the system. I will also turn up the pump speed.
What you might also consider doing sometime is, (ensure HW cylinder not calling for heating, switch off) with the CH is on and calling for heat, boiler on, switch off the CH demand or turn down the roomstat to shut down the boiler, see does the circ poump run on for a few minutes, 5 minutes is its default overrun time. Manually latch open the CH zone valve then refire the boiler, check for any noise or boiler codes.
 
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