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Typically 0.8 Bar for a standard install ie. boiler not in the basement and several floors above (that would preclude a higher pressure)). Check pressure with zero pressure on the water side of the vessel. Be amazed if that vessel's still ok....but they were tough boilers given most were illegal...

Flexible cables

Leaky alkalines

I suggest you check whether you can get your buildings & contents insurance to cover it....anything apart from a purely admin role and it's almost impossible to find a suitable policy. There have been many articles published over the last few years looking into this hurdle, estimating that...

Turn the boiler power off at the wall. A common leak is the LHS plastic manifold pin holing. The 2nd pipe (15mm) along from the RHS...follow it up into the boiler and turn the isolating valve 90 degrees. Hopefully that will stop it. Don't use the hot taps.

The trade's full of incompetence...the earth lead and spark symbol next to the electrode are more than enough to get it right, let alone the manual and shape of the electrodes.

If this is a Megaflo 2 GA then indeed the electrodes are swapped. However, this model has the dire gas adaptive system (it constantly monitors the gas/air mix using the flame sense electrode). It will be very confused as the flame current will be different between ignition & spark...

WC flush valve leaking?

It depends if you're the typical diyer that spends an hour heating the joints but you could wrap a wet rag around the street elbow joint. With pump pliers gently crimp the end of the fittings so they grip the pipe...you can then pre-fab and solder the lot in one go. Offsets look a lot nicer with...

As the scan live data is showing a pressure reading the AC system has an analog output sensor (and not a simple trinary switch) so don't go shorting out pins. Hope you didn't waste time with those diy cans...the refrigerant charge needs to be the appropriate amount for tge vehicle. We pressure...

It looks like the classic baffle problem. Do a forum search snd you'll find numerous postings going back 6 or 7 years showing pics.

Given the lack of screws on those FETS it does look like a simple mechanical bonding rather than proper heatsinking. Use Dowsil 744, it's an electronics grade silicon that only releases non corrosive alcohol solvents during cure...

What are building control charging you to get the install/flue work checked and signed off by a Hetas installer, although any installer is mad to sign off others work (when they can't really see properly whats been done), in the gas trade it's banned. This could all come back when you sell the...

Normally any flue work either remedial or new is notifiable work to the local authority under the building regs. You must be either Gas-Safe or Hetas registered to self certify your work. A roofer (or builder) will not have the knowledge or qualifications to do so...and the qualifty of the...

Google compression slip coupling...these fittings don't have a centre stop. The longer version is sold as a repair coupling.

You shouldn't need to run the pump on speed 3 especially since the boiler is designed to run with a more favourable 15 to 20 degree drop. Since the the heating side appears to function as expected (although it is only really tested when outside temperatures are down to zero) I wonder if the...

Is this an old cylinder with the primary coil designed for gravity circulation from the boiler? With 28mm primaries it would suggest so.

Connect your bathroom feed etc. to that capped 22mm pipe on the pressure reducing valve. Has the installer filled in the benchmark logbook and notified the install? You should get a building regs. compliance certificate. Pipework should be lagged...where's the expansion vessel?

Have a look at this Quantum engine throttle plate...looks like you've bent the the spring pivot...

There are a few other boiler checks that need looking at including airflow..and unfortunately it's beyond diy.