Rinnai Demand Duo R Series Installation And Operation Manual page 46

Combustion Fan
6 1
• Ensure fan will turn freely.
• Check wiring harness to motor for
damaged and/or loose connections.
• Measure resistance of motor winding.
Water Flow Control
6 5
The water flow control valve has failed to
close during the bath fill function.
Immediately turn off the water and
discontinue the bath fill function. Contact a
licensed professional to service the
appliance.
PC Board
7 0
• Check PC board DIP switches for correct
position.
• Check the connection harness at the
connection on the PC board.
• Replace PC board.
Solenoid Valve Circuit
7 1
Flame Sensing Device
7 2
Replace the PC Board.
Water Leak Detected
7 9
Water has been detected at the bottom of
the unit. Turn off water supply. Check all
plumbing internally for leakage.
Scale Build-up in Heat Exchanger (when
L c
checking maintenance code history,
#
"00" is substituted for "LC")
LC0~LC9 indicates that there is scale build
up in the heat exchanger and that the heat
exchanger needs to be flushed to prevent
damage. Refer to the flushing instructions in
the manual. Hard water must be treated
to prevent scale build up or damage to
the heat exchanger.
To operate the water heater temporarily
until the heat exchanger can be flushed,
push the "On/Off" button five times.
Repeated LC codes will eventually lockout
the water heater.
Demand Duo™ R-Series Installation and Operation Manual
Maintenance has been performed
f f
Indicates a licensed professional performed
maintenance or corrected an issue.
No Code - Nothing happens when pump is
activated
• Clean inlet water supply filter.
• Verify you have at least the minimum flow
rate required to fire unit.
• Verify turbine spins freely.
• Measure the resistance of the water flow
control sensor.
46