Rinnai Q85SN Installation & Service Instructions Manual page 65

16.1.3 Block 12
16.1.4 Block 60
maximum average T of supply and return
sensor for hot water is repeatedly exceeded.
Operation is normally possible for the central
heating installation during the block. The pump
continues to operate at minimum capacity
during the block.
check flow through
the boiler and DHW
tank
see the installation instructions for the hydraulic
connections to the boiler
possible causes: (radiator) shut-off valves closed
or blocked water filter
resistance (coil) in tank to high (see pump
height)
check 3-way-valve on function and pollution.
incorrect parameter setting for the minimum
or maximum power
Execute
Parameter-Reset.
an incorrect setting has been detected. The
factory settings are activated after the "green
key function" is executed:
Make sure that the text
on the display. Continue to press the Store
key until
factory settings are now copied and the boiler
will come into operation normally.
can be seen
appears on the display. The
65