Redring Active 320S Installation And User Manual page 13

The position of inner knob "B" will be approximately the same each time the shower
is used, varying only with incoming water temperature or pressure changes
(e.g. you will only need to change from summer to winter).
During normal operation, if an overheated water temperature is sensed then the
heater will switch off and the neon indicator will go out.
The water will continue to flow and cool down before the heater switches back on
again.
IMPORTANT WARNINGS!
DO NOT SWITCH THE APPLIANCE ON IF YOU SUSPECT IT OF BEING FROZEN.
WAIT UNTIL YOU ARE SURE IT HAS THAWED OUT.
DO NOT OPERATE THE APPLIANCE IF WATER LEAKS FROM THE PRESSURE RELIEF
VALVE. MAINTENANCE IS REQUIRED BEFORE THE APPLIANCE CAN BE SAFELY USED.
CONSIDERATION SHOULD BE GIVEN TO SUPERVISING THE YOUNG, ELDERLY AND
THE INFIRM WHILST THEY USE THIS APPLIANCE
Leaflet No. 555-2136-01B
13