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A very common fault on Drayton actuators is for a return spring mounting lug to break off. If you unclip the head (unless it's a very old type) you can normally pull the end of the spring through the case hole.

Get him to whatsapp a pic of it...illegal to work on unventeds without it.

Have you asked to see his G3 card?

AFAIK Kingspan just buy in and rebadge the cylinder and now that Range are in administration offer no support. https://www.rangecylinders.co.uk/ There are several merchants that specislise in parts for these cylinders..you will have no trouble obtaining correct parts.

Even the whole inlet set is rarely more than £50. The control inlet set for older cylinders often becomes obsolete but the cylinder manufacturer will have alternatives. Whilst an 8 bar expansion relief is normal for some cylinder makes I can find no reference to the Tribune ever having anything...

He's lazy and incompetent...the correct expansion relief valve is 6 bar and readilly available from many specialist suppliers. Typically £15 to £20 plus del. The dripping valve is normally due to insufficient air charge in the vessel but can be down to several other reasons. Get him back and...

Do mean you have a switch on the wall (sink) that just turns on the upper heating element? And a lower element that only turns on overnight on cheap rate electric. Perhaps the lower heater has failed or the cheap rate electric is not being enabled.

The Powermax is an unusual design and 9 out of 10 installers won't understand it. It's basically a conventional heat only boiler combined with a small unvented cylinder. This gives an (initial) exceptional hot water flowrate to feed the extra demand when all hot outlets are in operation. The...

It sounds like the appliances are all very old and obsolete in which case no sensible gas installer will want to deal with (there are also many regulations regarding flueless and open flued appliances) and in a renovation the builders/homeowner will often ignore. Just buy a cheap electric...

Professional plumber...chancer, he fitted it knowing it will eventually leak and create business. Post a pic of that lockshield spindle...it looks cheap and again will eventually leak. Merchants sell crap parts for the dross of this trade to fit and maximise income. BS2767-10 written on the cap...

The telescopic extensions always leak...the o ring inside fails. Replace it with a solid extension available in various lengths or to be cut down eg...

The pump runs for both hot water & heating. I'm not familiar with this model but you could try running the heating for 15 minutes and operating the hot tap a few times whilst it's on. Sometimes air becomes trapped in the boiler over summer (and the internal auto air vent' is either...

If he's not easy to contact (within normal working hours) surely it's time to bin him off. You should also note that a dedicated branch fitting must be utilised on the stack...a strap boss (and equivalents) are not permitted. This is from the BPF that represent most of the main pipe...

The valve has probably not undergone the tests required for suitability to connect to the public water supply and in this country most quality importers/manufacturers would also seek WRAS approval. Of course that doesn't stop 1000s of suppliers selling unapproved/untested products for the public...

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.