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if its indirect just leave it un connected. ( it is purely an independant coil) if this is an unvented cylinder then you should be working on it as you need to have a current G3 qualification as it is deemed as dangerous as gas

remember diversity (BS6400-1 only applies if more than 2 appliances fitted )for combi boilers is 0.8 , cookers is 0..4 30*08 11*0.4 24*.8 that only equates to 47.6kw so well within spec

Yes it will be trying to preheat the hot water but sending it round the rads and the Dhw plate.

You can manually select pump speeds 1 to 6 but pump,speed A and B are only used in the auto function. Problem is to get pump pressure of A would require a free flowing primary circuit. My guess is that system will have 22mm primaries. If that is the case then the boiler would only ramp up to...

the option of A and B is not selectable. If your system is not getting all the rads hot and it is also new it could be that you still have some airlocks. I would recommend that you change the pump speed to option 6 ( highest available). And then close all the rads. open 1 rad at a time with...

10mm pipe can supply up to 4kw of heat.

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Because the internal baffle had failed. If you replace with an oversized expansion vessel they last much longer

Have fitted loads of external,expansion vessels on mega flows and they have continued to be in use. Some of them I did over 15 years ago and still working

Replace expansion vessel

turn off isolator on heating pump. Leave hot water on. Put hand on heating return pipework. Open the valve you have just closed and you may feel the return pipework get hot . If it does it means the non return valve is not working and allowing reverse circulation.

never rely on the auto switch over valve as it will switch over when you still have upto 5% left. even more if the temp is cold. leave the bottles turned off on 2 until you run out and then switch them on.

you have altered the burner to the completely wrong settings. those are for a non bx burner head. you need to alter to these. 0.75/80/eh nozzle 10.3 bar/150psi oil pump pressure combustion head depth at 19mm. you have to use the special tool to set this air shutter start at 4.25 and...

it could be tha, but you don,t get heat leaking out past it. It draws cold water from heating back down it and cools the exchanger. Easy test is to turn the pump isolater off and see if it stops the hot water from trying to reheat

These semi blue flame burners can be setup wrongly even with an analyser. There are a number of potential issues with the setup. You have changed the photocell? Put the old one back in as a guess you have fitted the wrong type. Send us some updated pictures of it all cleaned. Main exchanger...

this needs to be fully cleaned. both the main exchanger and the secondary exchanger. it then needs the burner to be cleaned and have a new nozzle and be setup correctly using an anaylser. this is not a diy job. This is most likley caused due to boiler not being serviced reguarly . ( max about 14...

Haven't seen those issues here in norfolk. warmflow with the exchangers rotting through halfway up the main exchanger and grant slave cylinders on external models are my main problems. Leaking on the down firing worcesters on the secondary plastic exchanger casing have normally been down to...

This is the later version boiler. Might even have the Rdb bx burner. Bet he has put the wrong type photocell in. Had a few of these soot up if they haven’t been serviced for more than a couple of years

just use a standard honeywell wiring center with 12 terminals. you can get 3 or 4 (0.75) cables in to each connection point. use programmable room stats for each zone. Your heat pump normally needs volt free switching. to do this instead of live to the grey of each 2 port valve you have to...

Check that hot water pump is spinning. check that all the air is out of the circuits. ( double check the manual air vent with the system turned off) make sure the auto air vents work as well make sure system pressure is at 1.0 bar. check that the flow ( grey cable ) and store ( black shroud)...