IBC HC 15-95 Installation And Operating Instructions Manual page 66

5.4.8 Hot Water Does Not Reach Temperature (this section is used with the DC
Series Boilers only)
POSSIBLE CAUSES
DHW flow too high.
Temperature setting for water circuit too low.
No heat transfer as a result of lime scale or
fouling in the heat exchanger DHW side.
Cold water temperature <5°C.
5-10
HC SERIES BOILERS HC 13-50, HC 15-95, HC 15-96, HC 20-125, HC 33-160
SOLUTION
Adjust the inlet assembly, insert a flow restrictor.
Adjust the hot water circuit, depending on the desired temperature and
system configuration. See Table of Programmable Parameters in DC / HC
Controller Manual.
Descale or flush the exchanger DHW side.
INSTALLATION AND OPERATION INSTRUCTIONS