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The cyl stat only turns the cylinder zone valve motor on or off. Under a demand the stat would energise the motor. As the motor opens the valve a cam/lever also rotates and operates the microswitch when the valve is nearly fully open. It is this switch that then energises the boiler & pump ( via...

AFAIR the 400 series doesn't control the pump so a failed zone valve microswitch is the 1st item to check.

PVCu/uPVC is standard waste pipe...needs to be muPVC or cPVC ...ie. modified or chlorinated PVC.

I would suggest that for many people that couldn't be further from the truth..when did you last apply for a court judgement? 20 years ago when I issued my 1st claim it was far more straightforward but the process is now more time critical and formal. A recent claim I helped our daugher with had...

With the following knowledge you might be able to prompt the installers to resolve the issues with the threat that you'll approach local building control with a non compliant system. Have a glance at Approved Document L vol 1 This is a legal requirement and sections 8.8 & 9.8 refer to...

These traps are generally non compliant and you run the risk of drain odours as the water seal is insufficient. There are multiple reasons for loss of trap seal. Normally Approved Document H calls for a 75mm seal unless it drains into a gulley/hopper (ie. it's not under the influence if other...

Indeed..

Have a look at the hot outlet connection on top of the cylinder..there's a faint chance it's the source.

You do realise ventillation requirements of boilers comes under gas safety law...and guessing at it can have serious consequences.

Ventillation requirements for boilers will often come under "gas work" as they are based on calculations and not guessed at. The sizing of vent holes and vent positioning is also defined. Out of interest what is the exact boiler model and approximate size of this storeroom?

You've got the heating equivalent of the internet with so many routes the water can flow. Just rip it all out and lash it back up to get a basic system running. What boiler model?

You can't fit just the TRV head to the old valve...

Remember that many wet belt engines also utilise a wet belt for their oil pump drive..this can also fail and is not always changed. The Puretec engines used on many Stellantis group cars now have a chain conversion kit that hopefully solves the problems for the remaining cars life...although...

It looks like you knocked the crap out the nut too. New trackrod ends and nylocs required for you and other road users safety. With the correct tools & technique there's no need for that damage.

Hemp was banned decades ago on potable water connections. Try Loctite 55 string instead of tape.

Sure if you go mad it will blow the opposite face off the brick as the bit breaks through but so will a traditional impact/percussion drill. You've got variable speed and you can always pilot hole drill first with less risk of breakout. Once you've used SDS you will never waste anymore time with...

Get the PBH... Apply a little grease to the SDS bit (chuck end!) and let the drill do the work...you don't need to apply loads of pressure.

PTFE tape wound as a taper on the male threads or Loctite 55

Get a compression elbow and a bit of pipe and rejig the valve so it points down. Then feed the hose up through the base of the unit so it's not strained. Deburr the hole through the unit base.

Post pics of pipework and anything related..