Title: 315.022 OSO-NANO-N-MANUAL-NO-SE-FI-EN-146007-05.pdf
Raise the temperature on the thermostat to the maximum; see ‘User guide’.Contact auth. installer.Fuse/earth breaker trips repeatedlyPossible fault in the heater’s electrical system.Verify as follows: a) cut the electric supply, b) unscrew the cover, c) visually check the junction box for any problems. If so, con- tact auth. installer to check. Fit the cover.Knocking in the pipes when the hot tap is closedLarge pressure increase when the tap is closed quickly.Completely normal. Fit AX expansion ves- sel if troublesome. Contact auth. installer.