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depends on space for access to test points. always recommend fitting the identical as its much easier

your answer is in the manual. but if you are unable to locate it. It is with detail about which burner is fitted. an 18/25 is fitted out of the box set at mid output would use 2.33lt/hour. when you say you are down to 50lt. how did you measure this? you have said basically that your heating...

you would be best to fit an esbe load unit on the wood burner. this forces the woodburner to always have a minimum 40 degree return temp and continually pumps when flow above 60 degrees but decides if flow should go to the thermal store or just on bypass around the woodburner. This type of...

you can buy all the spares for them. but a whole new unit can be bought but it about £700

So which model thermostat do you have I'm guessing CM927. Do,you have a red light flashing on the receiver Box?

get a heating engineer out as the fault is will be gas related and we are not allowed to give DIY advise on gas issues

If you use a combined feed and vent such as an airjec then no need for the Overheat kit.

Rads can be installed in conservatories and be connected to the existing system provided they have independent control. ( evohome comes in handy)

just call a local engineer to come and look at it. but the code you have given is not correct as this control box doesn't produce that code. this box only produces 3 codes. Sequence: illuminated phase dark phase Flash-Code dark phase ❘ ❚ ❚ ❚ ❚ for 10 sec for 0.6 sec for 1.2 sec Error...

that sounded like a partially blocked feed pipe to the expansion vesssel or the prv releasing. do you have to keep topping up system pressure?

my guess is that your changing of rads has meant that you didn't re balance the system or it wasn't balanced to start with. As a quick guide which should get you close is to close alll upstairs lockshild valves and open 1 turn, and repeat the same for down stairs but open 1 turn but you may...

we need the answers to muggles questions before we can give any advise, most likely there are numerous things that can be done do improve your situation

your heat loss is probably less than 20% of the ops older property.

The exchangers on the Vaillant 618 can be poweflushed, however if it has any tubes that are badly blocked then it won’t be able to shift them. But on most cases we are successful at flushing them

could be that flow and return is crossed on the boiler

adjust to all downstairs so lockshield valves are open 1.5 turns and all upstairs to 1.0 turn open. But before you do that make sure that the trv heads on the affected rads do not have the pins stuck down as this is the most common cause for rads not working

So luckyfor you it's covered under their 25 year warranty, as long as you have had it serviced every year. Always have trouble getting them to do this but be persistent

I love spell check !!

Afraid you are giving incorrect advise.

most boilers come with a spare fuse, and most boilers get skipped before the need to use them!!!