vokera compact 29he: DHW ok/ CH cuts out after 10mins???

[johno_uk]

After any advise, been to look at vokera compact 29HE fault. No MI present. Hot water is ok and heating works fine for about 10mins, then boiler goes back into stanby. No lockout or red/amber led. Green light flashes faster. You can then turn off/on and will repeat the cycle. On first look, everything looked ok: Flue, APS, thermostat. Spoke to Vokera tech line, who reckons it has to be dirty venturi or gas valve. Cleaned out the venturi and replaced the gas valve (was stuck on min burner pressure) and set to correct min/max burner pressures. Problem still exists.

Anyone any ideas or had similar fault? Thanks in advance

 

[aggis]

Primary thermista, worth looking at.

 

[johno_uk]

that was my first suspition too, but appeared to be ok, will double check again tomorrow.


Cheers for your reply

 

[Vintyd]

Hi did you find he problem here? My Compact HE 29 has started doing this, hot water is fine. Turn on the heating and it fires up and stays on between 10-20 seconds and then goes back stand by and flashes green, turn hot water on and it fires up no bother and get hot water just no central heating...