Help identifying outside pipe/heating

[bimsb6]

RevsPerMinute said:

Temp down on boiler. Hot water was scolding hot before.
Next you're going to tell me we are all going to die from legionnaires!

More likely to die from bad advice than legionnaires .

[forest07]

RevsPerMinute said:

Temp down on boiler. Hot water was scolding hot before.
Next you're going to tell me we are all going to die from legionnaires!

You should control the domestic hot water temperature with the thermostat on the Megaflow, leave the boiler thermostat set high.

[outnumbered]

RevsPerMinute said:

Ok, the pipe under the tundish is 22mm. The external drain is 28mm. I got SWMBO to tip a little water down the tundish Pipe and it came out of the drain.

Now,
I went to replenish the air gap in the tap and followed the procedure.
Turned off water supply- Ran the cold tap for 5 seconds until ran dry.OK
Opened lowest hot tap - About two drops from hot tap then nothing.
Went up to tank and twisted the valve open and nothing. No water and no gurgling. What to do now?


Thinking about it there has only been a slight damp patch occasionally under the external drain. Tonight there was a small puddle (more than ever before hence the investigation) Now, (about 4 hrs later) it just damp again.

Your thoughts, if you don't mind..

Where did you turn off the water supply ? If you turned it off for the whole house, then the recharge procedure won't work as it needs water pressure to recharge it. There should be a stopcock somewhere near the Megaflo that you would turn off (at least, that's how it was in our old place).

[KTF]

What is on the other side of the wall from the pipe that is leaking? Is the kitchen on the other side with the boiler higher up on the same wall?

If it was the cold water tank in the loft (if you have one) then I would expect the overflow to come out somewhere by the eaves rather than run all the way down the cavity to ground level (unless something has changed)?