My Vokera Excell when i turn the hot water tap on it runs hot and then goes cold any idears please

mike, October 2006

I had intermmitant hot water problems with my 2002 linea 28. ie with shower and running baths and general washing up!, removed and descaled primary heat exchanger (only 2 posi screws with hex sides for your info) descaled with some brick acid i had and flushed out with clean water, lots of crap came out! and while it was removed it was simple to remove sensor and when removed it had plenty of scale (was 8 years old!) replaced for a tenner plus vat, built back up and water problem solved! no doubt saved myself a fortune on calling out an engineer!

Jon Holly, December 2010

Had same problem. Also now heating comes on when control is at water only. Voker blames ph of water!!!!
Anyone had similar problems?Ali

Ali, Edinburgh, July 2007

It's the heat exchanger. Had exactly the same thing and, according to Vokera, it's a sign that the primary heat exchanger (about £75) is gunked up. Changed it and everything was fine.

Treetoad, March 2007

its nothing to do with the pressure if the pressure was to low boiler gos in to lockout mode (shuts down) check the control dial on the front these boilers suffer from connection problems. (titch, whats the heating got to do with the hot water tap-----------nothing)

hi-spec plumbing, October 2006

if its a combi boiler try toppin up your water pressuer on the central heating up to roughly 1.2 bar there should be a filling loop built into it at the bottom

titch, October 2006