Good morning all, I hope someone could help me out here. My boiler is a Vaillant ecoMAX 828/2E. Five years ago we changed the internal pump when we power flushed the whole central heating system but apart from that it has always worked fine both in winter and in summer.
Since last week though I noticed that the pump keeps running with no hot water demand. Like...every minute! The "tap" symbol appears on the boiler system display for 1 second, the pump activates (no normal flame image though), then it stops for a little bit until when the tap symbol appears again and here we are again...I wonder if this is due to the extremely high temperatures of these days or if it got jammed or if there is a leak in the hot water pipes or...I don't really know...
To give you more background, the only way to stop it has been so far to switch the boiler off. When I turn it on again the system code is S.31 ("No heat demand boiler in summer operating mode") with the display showing 30 degrees. But within seconds the tap symbol appears again for 1 split second and the pumps starts running, with the S.17 code on. It's not a fault code but the manual says "DHW mode – pump overrun error". No hot water is used in the kitchen, basin or bath though.
Clearly central heating is switched off (e.g. thermostatic valves in the radiators set to ZERO, central Drayton thermostat set to 5 DEGREES, WiFi time controller set to OFF, etc.) hence the only demand can come from DHW.
I have tried to contact the 6 Vaillant-approved technicians closest to my post code and one of them serviced the boiler. The only comment that he made is that the boiler is approximately 10 years old hence it is meant to make noises...but the operation is fine according to him and it's not worth spending more money on it.
I don't think this is fine at all. The noise of the pump running constantly does bother me at night, but most importantly this has never occurred to date and I believe it may affect the performance and the life spam of the various components, if not the safety of the operations, hence I would like to understand what is causing the pump to run continuously and fix it if possible.
Have you ever come across something similar? Thanks!
Since last week though I noticed that the pump keeps running with no hot water demand. Like...every minute! The "tap" symbol appears on the boiler system display for 1 second, the pump activates (no normal flame image though), then it stops for a little bit until when the tap symbol appears again and here we are again...I wonder if this is due to the extremely high temperatures of these days or if it got jammed or if there is a leak in the hot water pipes or...I don't really know...
To give you more background, the only way to stop it has been so far to switch the boiler off. When I turn it on again the system code is S.31 ("No heat demand boiler in summer operating mode") with the display showing 30 degrees. But within seconds the tap symbol appears again for 1 split second and the pumps starts running, with the S.17 code on. It's not a fault code but the manual says "DHW mode – pump overrun error". No hot water is used in the kitchen, basin or bath though.
Clearly central heating is switched off (e.g. thermostatic valves in the radiators set to ZERO, central Drayton thermostat set to 5 DEGREES, WiFi time controller set to OFF, etc.) hence the only demand can come from DHW.
I have tried to contact the 6 Vaillant-approved technicians closest to my post code and one of them serviced the boiler. The only comment that he made is that the boiler is approximately 10 years old hence it is meant to make noises...but the operation is fine according to him and it's not worth spending more money on it.
I don't think this is fine at all. The noise of the pump running constantly does bother me at night, but most importantly this has never occurred to date and I believe it may affect the performance and the life spam of the various components, if not the safety of the operations, hence I would like to understand what is causing the pump to run continuously and fix it if possible.
Have you ever come across something similar? Thanks!