Boiler losing pressure

[peter wilson]

Hello All
Have Worcester Greenstar he 30 boiler, loosing pressurer about half a bar a night. I have isolated the boiler from the CH system, and turned boiler off still loses pressure. nothing comeing through prv or epansion vessel air vent no visable leaks. Any one got any ideas
please

 

[diamondgas]

Sounds like it may be the main heatexchanger ... If it is the water will be running out of the condensate pipe and you'll never see it!

 

[peter wilson]

Hi thanks for your reply, could it be diaphram in converter valve letting ch water into hot water system. I will isolate ch system again and after pressure drop look in main heat exchanger to see if signs of any water.

 

[Billy Bob Bob]

could it be diaphram in converter valve
no

 

[diamondgas]

:iagree: Also, rather than disturb the boiler flueway, dodgy if you're not GSR, can you access the condensate pipe? With everything turned off see if you are getting any water travelling down it ... You shouldn't!

 

[arran197]

Had this before on a Baxi, the secondary heat ex had a leak which was going straight down the condense pipe. If you have isolated the boiler and it is still loosing pressure then as has been said, disconnect the condense pipe and catch anything that comes out of it. When the boiler is off, the condense pipe shouldn't run with anything.

 

[peter wilson]

Hi Steve had a look in main burn after isolating boiler and turning pressure up, yes water was coming in.Very expensive part called, worcester regards ten year guarantee my boiler was 2005, ten year guarantee was for 2007 onward. Any way pleasant suprise they offered me two possabilites a one off repair fee of £230-00 or twevlve month cover plan for £285-00 included replacment main heat exchanger and any other parts and the twevle month cover.
Phoned them to day at 12pm and took the cover plan, engineer came at 2-30pm and replaced exchanger and prv just in case also new electrodes in burner. Well happy it just shows on expensive parts there worth a call fixed price deal. Thank you for your help
Peter

 

[peter wilson]

Thanks arran for your response got sorted now as you can read in my reply to diamondgas
Cheers Peter

 

[diamondgas]

Have a warm Christmas Peter 🙂