My newly installed Vaillant ecoTec 831 is doing two things which puzzle me, and may be related :-
1) With central heating off - when I draw cold water, on turning the tap off the pump starts and the pressure gauge drops. There is no sound of water passing through the radiators, so I would say it is pumping against a closed valve. This happens intermittently, the pump staying on for about 15 seconds after which the pressure gauge returns to normal. Sometimes the gas valve symbol appears on the display and the "hot tap" symbol both of these going off within a second or so. On one occasion the burner also came on briefly.
2) With central heating on and burner on - if I draw cold water, when I turn the tap off the burn stops, the pump continues running for 10 seconds or so, shuts off, then restarts almost immediately followed by the burner restarting. This also happens intermittently.
The installer says that the 831 "sometimes gets itself in a knot".
The first one seems to me to be a possible software problem.
Any ideas would be very welcome.
Regards
Geoff Smith
1) With central heating off - when I draw cold water, on turning the tap off the pump starts and the pressure gauge drops. There is no sound of water passing through the radiators, so I would say it is pumping against a closed valve. This happens intermittently, the pump staying on for about 15 seconds after which the pressure gauge returns to normal. Sometimes the gas valve symbol appears on the display and the "hot tap" symbol both of these going off within a second or so. On one occasion the burner also came on briefly.
2) With central heating on and burner on - if I draw cold water, when I turn the tap off the burn stops, the pump continues running for 10 seconds or so, shuts off, then restarts almost immediately followed by the burner restarting. This also happens intermittently.
The installer says that the 831 "sometimes gets itself in a knot".
The first one seems to me to be a possible software problem.
Any ideas would be very welcome.
Regards
Geoff Smith