Hi All,
I hope you can help identify the problem with my Vaillant 831. I've had it for about 5years with no probelems but the code F75 appeared. The plumber could not get here so said to increase the pressure in the boiler which did the trick.
When he did arrive he said the sensor was ok but the fault was with both the filling loop valves which were leaking. He said in his 30yr experience he'd never seen both leak.
However, to stop the F75 code, I have to increase the pressure, the pressure rises very quickly (to the end of the guage)..I then release pressure after a few days but have to put more than the amount which would trigger the F75..and so the cycle continues.
Is it as simple as dodgy valves??
Thanks in advance
Zahid
I hope you can help identify the problem with my Vaillant 831. I've had it for about 5years with no probelems but the code F75 appeared. The plumber could not get here so said to increase the pressure in the boiler which did the trick.
When he did arrive he said the sensor was ok but the fault was with both the filling loop valves which were leaking. He said in his 30yr experience he'd never seen both leak.
However, to stop the F75 code, I have to increase the pressure, the pressure rises very quickly (to the end of the guage)..I then release pressure after a few days but have to put more than the amount which would trigger the F75..and so the cycle continues.
Is it as simple as dodgy valves??
Thanks in advance
Zahid