Think my HEX is gone

[Gorners]

Just want to check thoughts of others before calling the heating engineer out. I’ve got a Greenstar 32CDI. For the last month or so the pressure has been dropping about 1 bar in 3 days. Have done all the checks on visible pipe work, can’t see any water on ceiling etc. also checked the expansion valve for drips.

It’s now started going down 1 bar in a day. I have now just had a good check of the external condensate pipe, and with the boiler not in use, it’s dripping about once every 5 seconds.

Is the only possible cause of this a cracked/pinholed HEX? Or could it be a blockage. I’m assuming with the pressure dropping as well it won’t be a blockage.

One other symptom is I hear gurgling under the boiler sometimes when it is running. Not always though.

 

[CBW]

I think you mean Hex, which we use as a short version of heat exchanger. Yep, does sound like it’s the culprit, perhaps give Worcester a call for a fixed price repair?

 

[Gorners]

I think you mean Hex, which we use as a short version of heat exchanger. Yep, does sound like it’s the culprit, perhaps give Worcester a call for a fixed price repair?

Thanks, edited. That was my plan once I’ve all but confirmed it.

 

[CBW]

What you could do, is isolate the flow and return valves under the boiler and if it still behaves in the same way then I‘d say it’s confirmed.