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HI printed circuit board,brain of the boiler .

HI it is leaking from the ball inside i am afraid you will have to change it.

HI if the noise is coming on ignition then it can many things. 1.combustion door seal loose 2.faulty gas valve 3.soot etc on the burner if the noise is coming after boiler has ignited and it sounds like kettling then BG is right .

HI release water from the system .choose highest point radiator.add chemical in to the system .leave it running normal for few days or weeks if the system is bad. then flush when water is hot.fill water, run, flush with plain water .repeat this few times to make sure all the dirty water has...

HI if the system is sealed then the pump should be able to get the air out.i have never had air lock in sealed systems.remember water pressure over 1 bar can easily take the air to the rads where you can release it .why do you need that many air vents ? fit couple if you want but your...

HI it sounds like system is scaled up.was the system ever flushed ? if not try some descaling chemical .

HI Agile only wants whats right .

HI bi flow directional .

HI for wireless room stat you need to run mains to the base unit and stat link from the boiler to the base unit.then stat can be fitted any convenient place.

HI what do you mean by bad hot water pressure ?

HI when you open the tap boiler fires .does the flow pipe get hot ?if this happens then it might be diveter valve letting flow out of the boiler .

HI could not upload the soundfile. it could be due to buildup of scale .does it sound like kettle boiling ?

HI could be worn fan.

HI is it a sealed system ?

HI they are right .most old boilers are fitted in incorrect position.

HI it sounds like faulty gas valve.

HI i would go for pcb .

HI noise can come from many places.very difficult without more details.

HI it is very difficult to give advice with info that you have provided.what sort of valve is it ?i doubt that the valve is the cause for the boiler problem. FED UP OF COWBOYS ?TRY INDIANS .

HI why did you change the dhw heat ex ??? have you seen filter at the cold inlet valve ?