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As said Worcester have been doing open vented combis for years ,still do, BG used to fit them all the time before they discoverd the power flush.

Crydoncorgi, what do uou meen "combis dont have f+e tanks" ?

Worcester 280 are available as an open vent boiler if so then you need to check that the tank has re filled. 280 are a bit of a s.. to get the air out ,if it is pressurised and you find the fill loop try it at 2 bar till you get the air out running between dhw and ch then when ok drain back down...

8)

The 240 was never available without an expansion vess , but as kev said fitting an external one can be cheaper and qiicker. Thai "big" screw must be the by pass screw, bet it leaks now.

Got a memo some place about that satronic fault, box basically gets stuck in ignition mode and stay there never goes to lockout just holds motor and transformer on, memo gives man date of said box, will try to find info.

How did he check the pump ? could be that the impellor is detached, motor will spin ok but nothing else.

The Satronic control box usualy the 832 gives that fault, if so you may find the transformer may allso be burnt out as it tends to hold the ignition on.

Had a 24cdi doing the same thing until boiler repositioned to a 3.5M flue, allso reduced the hunting when on high fire. best keep something running on the dhw circuit to avoid build up of sediment/corrosion.

24I uses a 15/60 they allso use some 15/50 pumps on other boilers, if you turn the pump speed down it can lead to overheating of the domestic side of the heat exchanger,the domestic side of the heat ex is mains fed so can only cool down when the htg side cools down

If your diagphram is faulty it usuall leads to int hot water or none on the 9.24 its usually the complete valve ,run a bath when the heatings been off and if you can feel the flow and returns to the heating starting to heat up then its the diverter valve, when 9.24 block up and give poor hot...

It sounds as if your diverter valve diagphram has gone, if you can look from under the boiler you will see a black box atached to the end of the brass diverter valve,when you run a hot tap the plunger on the end of the valve should come out about 10mm and contact the micro switch in the black...

If your installer has fitted 10mm or worse 8mm pipes to the rads this will give a velocity noise around the system as the 24i junior is a small water content boiler,if so biger circs and a by pass can help the situation.

Nothing els to try , no hidden butons.

When you finish the system you can go into the pump mapping ,not just the pump speed but resistance behind it if you set it at perm high to start with to balance the sytem then take it down if required.

If its an old 400 and not a 400e then you have no hot water senser just a hot water thermostat that controlls the heat at the slave tank in the boiler so at min the slave tank will be 54degC app and at max 82degC, so it controlls the amount of hot water not directlt the temp. The senser fitted...

No reason or rule against putting compatment vent into a bathroom its combustion vents that are unacceptable.

The eficiancy should be ok as you can range rate the heating,if you only have a 10kw load then you can set the ch output to 33%. Why do yo mention another expansion vess when the one fitted to the boiler is more than capable ?. Make sure that it has a decent gas supply pipe with as few bends as...

If you have a balanced flue model then you have to have ventilation to the compartment of 270cm2 at high level and 270cm2 at low level into the room if you have an FSN or FSP model (fan flue ) then you can avoid compartment ventilation if you have a MINIMUM of 30mm above the turret ,250mm in...

You should not get any soot at all so sounds very much as if your combustion is out and flue blocked.