I have a Vaillant ecoMAX 828/2E condensing boiler. The pressure gauge at the boiler is .75 bar and I want to increase it to 1-1.5 per the manual. The reason I noticed the low pressure was I turned the heating up at the boiler with no change in heat at the radiators.
There is a built in filling loop under the boiler with a valve handle at either end. The one beside the pressure relief valve I can turn, the other one close to the body of the boiler doesn't seem to move. There's also what looks like a valve between the two filling handles on the flexi loop with a plastic cap with a 'cross' slot - what is this for?. I turned the filling handle (that does turn) about a 1/4 - no change in pressure.
Can you help?
There is a built in filling loop under the boiler with a valve handle at either end. The one beside the pressure relief valve I can turn, the other one close to the body of the boiler doesn't seem to move. There's also what looks like a valve between the two filling handles on the flexi loop with a plastic cap with a 'cross' slot - what is this for?. I turned the filling handle (that does turn) about a 1/4 - no change in pressure.
Can you help?