Hi, Viessmann Vitodens 100-W, with Vitotrol 100 wireless digital thermostat. I'm not a plumber and just trying to help an old friend out if I can.
I've bled air out of the boiler a couple of times, as it was very noisy, this seems to of quietened it down. Some radiators don't get warm, but a couple of the first ones did get hot. All radiators were bled, but had no air out of any of them 14 in total, 12 with TRV's and all valves appear to be working freely.
I had started balancing the radiators, but boiler doesn't run long enough to do it?
Tried 2 options of asking for heating to come on, Hot Water is always fine
Method 1
CH is set to Manual and temp is set to 40 degrees (have tried sensible temps as well) Comfort temp is set to 26 degrees. Boiler fires up for a random amount of time then stops, radiators a little warm, but boiler just quietly sitting there and fires up randomly.
Method 2
Program 1 set for each phase to run continuously for a 24 hr period 7 days a week. Comfort setting temp 26 degrees, some radiators get a little warm, boiler just sitting there again. Fires up randomly, for probably less than a minute most of the time.
I'ts probably fired up 4 times in the past half an hour.
Any suggestions on things to try, only thing left for me to try out of desperation is to drain the system, flush it through and fill it properly, hoping that air or sludge could be the problem? Have spent hours on the manual, youtube and general searches, I'm out of ideas and on the verge of telling the old girl she will have to get a professional to it. Help greatly appteciated.
I've bled air out of the boiler a couple of times, as it was very noisy, this seems to of quietened it down. Some radiators don't get warm, but a couple of the first ones did get hot. All radiators were bled, but had no air out of any of them 14 in total, 12 with TRV's and all valves appear to be working freely.
I had started balancing the radiators, but boiler doesn't run long enough to do it?
Tried 2 options of asking for heating to come on, Hot Water is always fine
Method 1
CH is set to Manual and temp is set to 40 degrees (have tried sensible temps as well) Comfort temp is set to 26 degrees. Boiler fires up for a random amount of time then stops, radiators a little warm, but boiler just quietly sitting there and fires up randomly.
Method 2
Program 1 set for each phase to run continuously for a 24 hr period 7 days a week. Comfort setting temp 26 degrees, some radiators get a little warm, boiler just sitting there again. Fires up randomly, for probably less than a minute most of the time.
I'ts probably fired up 4 times in the past half an hour.
Any suggestions on things to try, only thing left for me to try out of desperation is to drain the system, flush it through and fill it properly, hoping that air or sludge could be the problem? Have spent hours on the manual, youtube and general searches, I'm out of ideas and on the verge of telling the old girl she will have to get a professional to it. Help greatly appteciated.