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Do you have an element heater in the cylinder.

Top one clockwise bottom one anti clockwise.

If the pins are jammed down thats no good, if they are hard to operate thats no good, Change the TRV bodies with the right heads and all will be ok.

You can try nipping the nut up, failing that its a drain down and remake the joint with some jointing compound, check the olive is ok whilst it is drained down.

Id get him to come back and correct that mess, and replace the tails with copper.

Correct DP, Naturally thought it was another Ferroili problem :oops:

If the guarantee is still valid call valliant, an internal leak would need an RGI to look at it.

Sounds like your diverter valve is stuck, turn the hot tap on and hold your hand on the flow pipe 22mm, if this gets hot its your diverter.

The drop in pressure is likely to be the leak from the radiator, you can turn off the radiator from the valves at each end and drain rad, if one side has a TRV fitted be sure to cap off rad valves, either half inch or three quarter inch caps. Removing the radiator and replacing with a new one...

Hot and cold flush " middle aged women's problem " Or judging by all the chemicals present in the system he probably means draining the heating system after its been running then flushing through with cold water until water from the drain cock is clean then refilling with fresh water adding...

First thing I would do before condemning anything is get the heating system cleaned out thoroughly, check rad valves and pump are operating correctly and balance system when re filled.

The filler loop has been removed, you will have to refit to pressurise.

Unlikely, a ballafix has a lip inside to stop tube going into far, take it of and try it free of pipe work.

I look after a 80ff for a customer and have done for about 10 yrs, This particular one has been faultless and put the more expensive boilers to shame. Not sure how your boiler has been looked after but a competent engineer should be able to sort it, they are a simple unit to deal with.

Cold or warm water from bath tap ? partially open the bath tap not fully and you,ll get hot water.

Its quite common to fit a tap before it feeds the combi boiler, meaning some people want an outside tap to the side of the house if its a semi or detached when the boiler is at the end of the house.

syphon for a tropical fish tank would be ideal.

Would be a bit careful there, stagnant water is a cause of legionnaire;s disease, But yes use a hose and hand protection. Get hold of a small electric pump and pump into a container you can seal.

Yes very easily.

Possible chance it may fail due to low pressure, Your plumber must be really busy not to find 5 minutes to re-pressurise your boiler.