"Water deficiency heat generator 1" - Vaillant fault

markwombat · 20 Dec 2017 at 13:20

Hi,

Just noticed "Water deficiency heat generator 1" on the heater control of our Vaillant thermostat. Can any one shed any light on possible meaning, causes and rectification of this?

Thanks in advance!!

DXP55 · 20 Dec 2017 at 17:44

Yep - know exactly whats wrong with it - I just googled "Water deficiency heat generator 1" on a Valiant

dholdi · 20 Dec 2017 at 17:45

And most helpfully posted a link to the results

markwombat · 20 Dec 2017 at 19:44

DXP55 said:
Yep - know exactly whats wrong with it - I just googled "Water deficiency heat generator 1" on a Valiant

Actually there are conflicting responses from Googling the fault code .... hence I thought of asking on here. Get back under your bridge ...

DXP55 · 20 Dec 2017 at 19:56

Ahhhh !! more info on original post would have helped. -

Doesn't seem to be a DIY job

markwombat · 20 Dec 2017 at 20:10

Thanks for the second post.

I just called a local plumber who suggested checking the pressure, it was indeed 0.7 bar, with the display suggesting it should be between 0.8 - 3.0. I've just re-pressurised the system to 1.3 idle (1.7 now the boiler has kicked in for the radiators etc) and the fault code has gone. The plumber suggested keeping an eye on it over the next 24 hrs but indicated that if this solves it then it will have saved me a £90 call out