HI
if you ring manufacturer they will be able to tell you whether it will be compatible .otherwise you can always fit different models but it will take a lot longer to fit.make sure you take pics number/label wires before removal
HI
a picture would help
with these particular models there are two slots.you can use special key or a flat screwdriver. if you look carefully you will find another one as well
HI
why did you pump air in E.V ?
put that piece of junk in the bin .
banging noise when firing
usually relates to
1.faulty gas valve /setting
2.electrode faulty
3.p.c.b faulty
HI
22 mm upto the shower is better than 15mm.you will see the difference in water pressure.and make sure you shower is suitable for low pressure system as most showers are for high pressure .
HI
if your house is new then surely boiler or the system has become faulty.forget the 17/19 deg temp at the room stat.room stat could be few deg out of adjusment.
al long as your room stat is on/calling for heat the boiler/rads should be on.
HI
empty the tank .use sponge,etc clean the tank.then drain through various rads downstairs/lowest point few times until water runs clear.then add sentinel cleaner leave it running for few weeks then flush again few times.finall add inhibitor.
FED UP OF COWBOYS ? TRY INDIANS