Rinnai Q85SN Installation & Service Instructions Manual page 90

17.4 Insufficient quantity of hot water
90
insufficient quantity of hot water
hot and cold water
connection to the boiler
mixed up
incorrect flow reducing
valve
in the absence of
positive results
lime scale in the tank
check left = cold, right = hot
check for the type and for contamination, if
necessary replace (Combi) and/or clean.
Check the comfort synchronising valve for
the correct setting in accordance with the
installation instructions
check for lime scale
if necessary descale or replace