vaillant 831

I have a Vaillant EcoTec 831 (2013 so '2nd generation). I see online that this model has a bad reputation for PCBs, and mine had to be replaced. As it was out of warranty, I found a local plumbing engineering to do this. I don't know where he bought the replacement - and since issues, I've...

This is a Vaillant ecoTEC plus 831. It completely shuts down (screens off etc) at instant of heat demand. Never ignites. After turning it back on, even if no heat demand is made it will still shut itself down in a minute or so. Also any time it shuts down you will not be able to turn it on again...

hi, we have an ecoTEC plus 831 and we’ve had issues with the heating staying on. When we came back from holiday the water pressure was low and I fixed this. The digital radio thermostat (Salus model RT300RF) was also out of batteries and we replaced these. No settings were changed. The heating...

Hi, In an effort to raise temps to at least 20 degs in the home, I have increased the target flow from 75 to 80 degs with no success, and the actual "heating target flow temp" value remains at 50 degs. To give you an idea, from 11 degs it has taken so far 9 hours just to 15.5 degs. Have also...

Hi all, Just some advise on how to connect the nest 3rd Gen heat link to my vaillant ecotec plus 831 boiler. Would I remove the jumper/link between 3 & 4. connect number 3 on boiler to Heatlink L and a jumper/link to 2 on Heatlink also. connect number 4 on boiler to Heatlink 3. connect number...

Hi all, I'm a user of a 831 (it's been fitted in 2010) and started having issues with it recently. I'm not qualified in boiler repair but have done a few days' research and this is what happens with mine: Started by throwing an F75 now and again but worked fine after a reset. When they became...