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Hi, give me your number by private message and i'll call you

I am and i live in Surrey :)

you are correct, it should be looked at by a Gas Safe registered engineer (no longer Corgi)

It's not an air issue, take the head of the TRV and see if the pin under it pushes down, you'll need something hard like a knife blade, it's to hard for your hand and please be gentle, also check the lockshield end and see if it's open, clockwise = closed, anti-clockwise = open

delete

Totally agree,

It's not the diaphragm your looking for, it's the back end of the valve as you look at it the CH section, You'll need to drain down boiler to repair

Correct

I always use Armaflex, it is more expensive but it bends around corners so no need for cutting and fitting, use tape or cable ties every 300-500mm, job done, some will disagree as it is personnal choice but all good lagging will work fine.

If it is a check valve (non return) which it looks like it goes on the hot tap feed, it stops the cold running down the hot supply

You want to put some heat into the flue first with a blow torch or something similar for about 5 mins, then carry out the test again with all doors and windows shut, also any extractr fans in the room on, use a smoke match first, before any of this is carried out a visual inspection should be...

Thats why i specified Pegler, you'll never have a pegler brake or not work, also all gate valves should be opened all the way and then back half a turn to prevent sticking

Stop draining the tank each time, either as already said fit isolation valves to each outlet or a gate valve (Pegler) on the cold feed from the tank to the cylinder and the cold feed from the tank to the cold outlets or just bung the holes with a rubber bung, you can buy bungs from any merchant...

Drainage pipe (underground) is cheaper due to no treatment

the underground drainage pipes are not UV protected and should never be left in sunlight

god knows how you managed that then, did you turn it off during summer ?

Thats still not allowed, all you are allowed to do is disconnect a free standing cooker from the flexible hose for lets say cleaning and then connect it back up, nothing more and certainly not allowed to connect it to the mains, so i have not got the wrong end of the stick, again get an RGI...

Gas work is not DIY thats why we are so heavily regulated, do you value your familys life so little that you would risk killing them, call an RGI without fail

This is a wind up surely

I have fitted many of the Honeywell, it offers all the features you want and many more, easy to use and not ugly, only downside is the batteries only last around 6 months, i have one in my house