I have an open vented central heating system with a hot water tank. Both heating and hot water circuits have a motorised valve controlled by a timer. The timer for the central heating is always in the “on” position and is governed by a room thermostat. The boiler is a Vaillant Ecotec Plus 428 which is about 10 years old.
Yesterday I had my central heating radiators replaced. The engineers struggled a bit to remove all the air from the system but managed to do so. The heating and the hot water are both working fine.
Even with the hot water and the heating switched off at the timer, and the motorised valves closed, the boiler does not go to sleep. It stays for several minutes in S7 mode (pump overrun). It then goes into S8 mode (anticycling). Then the boiler fires for a few seconds and goes back into S7 mode. It keeps on repeating this process. The pump appears to be running also in S8 mode, without the pump icon showing on the little screen. It just pushes hot water around the bypass loop, which has a manual tap which is slightly open.
Especially with the current price of gas, it would be useful to be able to convince the boiler all this faffing about is not necessary. I would be grateful for any suggestions.
Yesterday I had my central heating radiators replaced. The engineers struggled a bit to remove all the air from the system but managed to do so. The heating and the hot water are both working fine.
Even with the hot water and the heating switched off at the timer, and the motorised valves closed, the boiler does not go to sleep. It stays for several minutes in S7 mode (pump overrun). It then goes into S8 mode (anticycling). Then the boiler fires for a few seconds and goes back into S7 mode. It keeps on repeating this process. The pump appears to be running also in S8 mode, without the pump icon showing on the little screen. It just pushes hot water around the bypass loop, which has a manual tap which is slightly open.
Especially with the current price of gas, it would be useful to be able to convince the boiler all this faffing about is not necessary. I would be grateful for any suggestions.