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Differential probes and electrical gloves are the only safe way...

Until the op tells us what the 2 rooms usage is all discussion is pointless. I suspect the brief was vague and it generated so many options..

In the gas world we often have BS questions like this. The trick is to argue your point with the assesor and let them fill in the "correct" answer to get you through. They know the questions are often poorly phrased/nonsense etc. The correct answer in this case is A,B,C,D all those system...

£70 +V for a full service on Worcester CDis...what about the £80 in parts req. ?

No rheostats on this boiler, post a link to ebay the thermistors. On this model there are 2 heating overheat thermostats set at different trip temperatures.

Anything mentioning BS2767 part 10 is a good start. That normally implies a separate spindle nut that can be tightened down. But don't touch the Myson Matchmates...they are complete garbage (threads jam).

PTC thermistors were not unusual for boilers developed in the 90s when boiler control was less advanced. Some models had PTCs that had resistances down to a few ohms. What's the pump like?

The boiler might be full of trapped air. Run the heating and open the hot tap every minute or so. Keep reseting it and with luck it might solve the problem.

CH return filter blocked and/or diverter valve sticking would be the first items to check.. Dog of a boiler and must be one of the last still running.

IMHO The water regs are a statutory document ie. it's the law! https://www.legislation.gov.uk/uksi/1999/1148/regulation/4/made And to demonstrate a "workmanship" installation (reg 4 part 5/6) the installer should show compliance with standards such as... BS 6700:2006 Design, installation...

Looks like efflorescence...try brushing it off and with time as the wall drys the salts may stop coming to the surface.

https://www.google.com/url?sa=t&source=web&rct=j&opi=89978449&url=https://www.techtips.ie/Valeo/peugeot-citroen-and-fiat-clutch-judder.pdf&ved=2ahUKEwib_5KP1r-EAxUQaUEAHRPHDbEQFnoECA8QBg&usg=AOvVaw18o5MOfW9aRjf0CVMjIVrW My junk Zafira B had massive clutch judder when I bought it (it was...

We can't tell how butchered that box is...it could have a gaping hole into the cavity. If they're prepared to bodge that much then taking a lump hammer to the box won't worry them

Gas leaks on/around gas meters are common and the issue is whether they can find their way into the wall cavity and property. Without seeing exactly how the pipe exits the box we can't say for certain what course of action should be taken. Either way it's a bodge job. Best option would be to...

If it's in a Puma etc the back casing threads are not compatible with standard pumps AFAIR. Take a look on ebay...there's a few new Myson CP53 pumps on there at silly prices..just swap the head over.

Ok so it's got nothing to do with the Greenstar CDi boiler.... You need to get a G3 licenced plumber to sort out your unvented cylinder. As well as ther safety valve the expansion vessels probably flat/failed and given the rough installation don't be surprised if there's a few other things that...

They're always 3 bar..sound like someone's fitting the wrong one in the past.

That cable from the immersion heater needs sorting...it's been pulled out from cable clamp. Looks like you might have a shower pump...show us the other pipework around the cylinder.

Search for Megaflo baffles breaking down on here...they are not problem free.

Get yourself another heating "engineer", only by measuring static/dynamic water pressures and flow rates can you determine whether the incoming service pipework is sufficient. My own place has an imperial copper 1/2 main but with 5 bar static the flowrate is ample at say 1 bar dynamic (the...