Until late 2007 we had an efficient heating system, the house was comfortably warm and if you needed more you turned up the thermostat in the hall, the boiler fired, etc etc, pretty much a normal system. In late 2007 we had an ground floor extension to the rear of our house including underfloor heating, a repositioned Vaillant Eco Tech Plus boiler and 4 new radiators and 4 years on we have yet to get the thing running right!
Within days we noticed areas of the floor stayed cold, the fitter returned and reversed the flow with some slight success, then it soon became apparent the new rads were only getting luke warm where as the originals, some of which were downstairs, were getting as hot as you'd expect. We had the original fitter back several times over the 1st 3 years, he flushed it, replaced pumps, etc and generally fiddled about with it until I got totally fed up and had a Vaillant specialist round who could find only a minor setting fault in the boiler but was somewhat confused how the U/F heating was installed. He inturn called an U/F specialist who visited once, looked at it and never came back!
The biggest mystery for me surrounds the thermostat. It always seems to click at 20*, sometimes the boiler fires, usually not, but whenever it comes on it only seems to run no more than 1 - 11/2 mins and shuts off where as our original boiler would run, 5/10/20 mins as required to warm all rads and the house. Even if I whack the thermostat to 30+* it makes no difference, still short bursts and the kitchen with 2 rads andU/F heating hovers at 18-19* as does the hall where I have installed a thermometer next to the thermostat to confirm this. Oddly, the water, also heated from the boiler is usually hot.
I have only noticed 2 fault codes, F70 and F72, both of which I have pointed out to whoever has come , whether they are significant I don't know.
The thermostat in the hall is all that exists from the original set up, is that at fault, though it does seem to sometimes click the boiler on, even if it only runs for a minute or so, should I replace it? Everyone says the boiler itself is OK, is there a software glitch?Are the fault codes relevent? I could have a succession of fitters round until the problem is solved but I'm fed up handing out £80 here, £200 for parts there etc, etc, so I would welcome any advice short of ripping the whole thing out and starting again!!
Within days we noticed areas of the floor stayed cold, the fitter returned and reversed the flow with some slight success, then it soon became apparent the new rads were only getting luke warm where as the originals, some of which were downstairs, were getting as hot as you'd expect. We had the original fitter back several times over the 1st 3 years, he flushed it, replaced pumps, etc and generally fiddled about with it until I got totally fed up and had a Vaillant specialist round who could find only a minor setting fault in the boiler but was somewhat confused how the U/F heating was installed. He inturn called an U/F specialist who visited once, looked at it and never came back!
The biggest mystery for me surrounds the thermostat. It always seems to click at 20*, sometimes the boiler fires, usually not, but whenever it comes on it only seems to run no more than 1 - 11/2 mins and shuts off where as our original boiler would run, 5/10/20 mins as required to warm all rads and the house. Even if I whack the thermostat to 30+* it makes no difference, still short bursts and the kitchen with 2 rads andU/F heating hovers at 18-19* as does the hall where I have installed a thermometer next to the thermostat to confirm this. Oddly, the water, also heated from the boiler is usually hot.
I have only noticed 2 fault codes, F70 and F72, both of which I have pointed out to whoever has come , whether they are significant I don't know.
The thermostat in the hall is all that exists from the original set up, is that at fault, though it does seem to sometimes click the boiler on, even if it only runs for a minute or so, should I replace it? Everyone says the boiler itself is OK, is there a software glitch?Are the fault codes relevent? I could have a succession of fitters round until the problem is solved but I'm fed up handing out £80 here, £200 for parts there etc, etc, so I would welcome any advice short of ripping the whole thing out and starting again!!
