Unvented Systen losing Pressure

[Syd98]

Here again..
Boiler Ideal Minimiser SE with megalflo Water Heater. System as been losing pressure, ever since the pump was changed early December.
Local engineer changed pump (grundfoss selectric), one week later we stared losing pressure, same engineer said it was pressure vesse, so we changed that, and problem seemd to go way for 48hrs, now back with a vengance, loses 1 bar overnight.
All floor boards up (no leaks) all vavles checked when cold, everything tightened, no sign of water anywhere. No discharge from PRV, plastic bag on pipe for 2 days and no water.
When re-pressurized cold system holds if no CH or HW switched on.
System only losses after boiler as been on.
3 x local engineers have all given up. tell me to get a new Boiler and megaflo.
Any other ideas...?

 

[gas4you]

Heat exchanger gone and leaking into condense pipe.

Yet another of one of the worst boilers ever made I'm afraid, Ideal certainly deserve their reputation for making carp that the end user has to pay to put right.

The only place for these boilers is the skip, that is if you can find room in it with all the new ones that Ideal are making now already in there

 

[spudkey]

Check gauge is reading corectly it may be low so you are over filling system
and loosing pressure through PRV when system is hot

 

[spudkey]

ah! just re read your post no discharge from prv

 

[Syd98]

Cheers. Re assuring..!

how can i prove that this is the case, is there any way i can test this, how much water would you expect to be discharged from the condenser outlet?

 

[frankthegasman]

to check the heat exchanger is leaking into the condense leave boiler off and go to the end of the condense pipe if there is water coming out the heat exchanger is leaking ,goodluck