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The circ pump has the largest load then the gas valve then controls ,seems a bit odd it was ok before the re wire. if you have a new consumer unit your trip should be in the center protecting the heavy loads (skts,cooker,shower) and the smaller more likely to be a nuisance to the other side such...

Not familiar with your model but the sudden rise in system pressure plus overheat indicated and a banging noise all sound as if your pump has or is stuck plus the fan running on is prob on overheat (pcb trying to keep the heat ex cool)

You missed spending £10.00 on an oil pressure gauge, thats the best way to see if the oil is flowing ok and if you stripped the pump down you will have prob adjusted the output . you cant clean an oil nozzel it should be replaced at least once a year as the outlet is half the diameter of a hair...

The board retails for £138.88 inc vat so you should get one at a trade price for a bit less, it takes about 15mins to change.

First off the 24i does not have a diverter valve . Ive had this fault a few times now if your ch does not even attempt to re light without switching the dhw first then its the pcb sticking in its anti-cycle mode, only one solution ,a new pcb not a hard job but not that cheap.

Are you saying some people fit non return valves on a combined feed and vent pipe ? with no auto air vent and a poss blankesd off prv !

Its a24i not a cdi jim. Should have gone to spec savers

Slow flashing ch light is a burner lockout so nothing to do with fan ,ap and hose (fast flash) .When you say sensors does that include the flame sensor if not its simpler to change then test (not less than 5 micro volts dc in series with 0.5mb flame established) if you have replaced it the only...

The diagphram kit Worcester part nuber is 87161405530 its about £12.00

Sure ,got a couple in the van will get part number.

As your boiler is set up on an open vented sytem then you pressure gauge should read zero it only comes into its own on a sealed system , however if you have a lot of head (height of tank above boiler )above 20 feet you will get say about 1/4 of a bar BUT if the expansion pipe has 90 deg bends...

£174.44 is the set price from Worcester to replace upto 3 main components (excluding heat x ) parts plus labour and if you ask at the time of booking they will service it as well, thats the price for most of the country but a bit more if in the london area or rempte part of scotland. tel number...

Sounds as if the diagphram in the diverter valve is not reaching the micro switch that tells the boiler you have turned the tap on, diagphram kit available and easy to change on the 240.

The 30cdi is the one i would go for , but if the customer has no intention of touching the boiler after its in (turning the temps up/down etc) then the si would do its only a fraction less eficiant than the cdi

That mini expanion vess fiyying is so you can comply to a forgotten building reg, basicly in case the mains inlet expands when in ch mode for a period of time,example would be on a boiler with a double matrix heat ex in a caravan, customer leaves heating on low while caravan empty dhw expands as...

Worcester and Grant both good boilers but you should consider a condensing oil boiler with the price of oil still going up. An avv flue temp for a 100,000btu oil boiler is between 200 to 240 deg C , a condensing boiler has a flue gas temp below 60deg C if set up corectly.

Id say most important is to keep it safe, follow Mi and test it fully.

You say its a 24i junior ,is that a Greenstar junior or std eficiancy. Jiminblack , trying to keep installers happy ,recalls down,call planers happy and customers happy .what fun.

I try and clean most heat exchangers with a de scaleing machine ,exept for a few such as the 400 with no conection to atach the cleaner to it cant be done remoteley and cant be done in place as its vertical and any serious scale drops down and stops the flow. If you want to force the cleaners...

Thanks for all the advice, will contact the plumbing contactors in the morning, dont want to contact building controll etc as the house is up for sale . Did a bit of snooping yesterday there are 38 houses on the site 4 the same as mine and all have at least one open vent pipe ?