Title: Oso-Nano-VV-Bereder.pdf
Water pressure into the home is too high.The safety valve is worn or there are particles stuck between the mem- brane and the valve seat because the water is dirtyFit AX expansion vessel with absorbs ex- pansion during heating, and fit pressure reduction valve for stable water pressure inside the home. The pressure reduction valve is adjusted in according to the pres- sure in the expansion vessel. Contact auth. installer.Try to flush with water through the safety valve. Open valve for approx. 1 minute. See section 5.2. If the valve still leaks, it must be replaced. Contact auth. installer.Leak from heating element.Power supply interrupted.Verify as follows: a) cut the electric sup- ply, b) unscrew the cover, c) visually check whether there is a leak from the heating element. If so, replace the gasket/heating element. Contact auth. installer. Verify that the fuse is on / the plug is plugged in to the wall contact / the earth breaker has not tripped.No hot waterThermostat has cut out.