Vaillant Turbomax problem

[David937]

Hi there,

My Grans 9 year old Vaillant Turbomax VUW 282 is playing up; the pressure rises until it hits just above 3 which causes the PRV to open until the pressure drops to about 2.8, I have tried draining water off until the pressure goes to 1 bar but within a few hours its back on 3 and 2.8 and so on... I rarely see the boiler but the last two times I went there the pressure seemed to be stuck on 3 and it goes down slightly when you use the hot water but then goes back on 3, it doesn't seem to be going just over 3 so the PRV opens like what was happening before.

I recall last winter when I bled a radiator and topped the boiler up to 1.2 bar the pressure raised up to 3 bar when the system was running; I drained some water and it seemed to work fine after that.

Can anyone shed any light?

 

[twgas]

see faq on repressurising expansion vessel.

 

[David937]

see faq on repressurising expansion vessel.

Thanks, the schrader valve is at top of the boiler near where the flue exits isn't it?

 

[kevplumb]

yes

 

[David937]

EV all sorted but now the diverter valve is playing up

Appears to be getting stuck at times in the mid position (water gets luke warm and radiators heat up), it has apparently done it once last month and once this month.