On Thursday, 18 July 2019 00:24:01 UTC+1, John Rumm wrote:
On 17/07/2019 15:11, Harry Bloomfield wrote:
on 17/07/2019, John Rumm supposed :
Turn off the boiler. Top up the pressure to ~1 bar if required.
Isolate the CH flow and return. Now remove and empty the condensate
trap[1], and replace. Leave for an hour or two and see if pressure has
dropped. Check the condensate trap again. If there is a leak in the
main HX, then there will be water in there (you may even see an
occasional drip from the trap mounting point.

Isolator valves don't usually completely isolate, they will still pass
some water.

It does not really matter - if you empty the trap and the boiler is not
running, it should stay empty.


--
Cheers,

John.

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Thanks, will try trap test this weekend