KBD Series Manual 61
Electrical Grounding
licensed
professional
only
Check all components for electrical short.
Condensate Trap is full
Check condensate trap and drain line for blockage.
licensed
professional
only
Replace condensate trap.
Burner Sensor
Measure resistance of sensor.
Replace sensor.
Outgoing Water
Temperature Sensor
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build-up.
Replace sensor.
Heat Exchanger Outgoing
Temperature Sensor
Outside Temperature
Sensor
Inlet Water Temperature
Sensor
Modulang Solenoid Valve
Signal
Check modulang gas solenoid valve wiring harness for loose or damaged terminals.
Measure resistance of valve coil.
Burner Contact a licensed professional.
Secondary heat exchanger
There is scale build up in the secondary heat exchanger and it needs to be ushed to prevent
damage. Refer to the ushing instrucons in the manual.
Combuson Fan
Ensure fan will turn freely.
Check wiring harness to motor for damaged and/or loose connecons.
Measure resistance of motor winding.
Water Flow Control
The water ow control valve has failed to close during the bath ll funcon. Immediately turn
o the water and disconnue the bath ll funcon. Contact a licensed professional to service
the appliance.
PC Board
Check PC board DIP switches for correct posion.
Check the connecon harness at the connecon on the PC board.
Replace PC board.
Solenoid Valve Circuit Replace the PC Board.
Flame Sensing Device Replace the PC Board.
Burner Sensor Circuit
Check sensor wiring and PC board to be sure that they have not been damaged.
Replace sensor.
Scale Build-up in Heat
Exchanger (when checking
maintenance code history,
“00” is substuted for
“LC”)
LC0~LC9 indicates that there is scale build up in the heat exchanger and that the heat
exchanger needs to be ushed to prevent damage. Refer to the ushing instrucons in the
manual.
To operate the water heater temporarily unl the heat exchanger can be ushed, push the On/
O buon on the temperature controller 5 mes. Repeated LC codes will eventually lockout
the water heater.
Please call Rinnai technical department.
Maintenance has been
performed
Indicates a licensed professional performed maintenance or corrected an issue.
Nothing happens when
water ow is acvated.
Clean inlet water supply lter.
On new installaons ensure hot and cold water lines are not reversed.
Verify you have at least the minimum ow rate required to re unit.
licensed
professional
only
Check for cold to hot cross over. Isolate circulang system if present. Turn o cold water to the
unit, open pressure relief valve; if water connues to ow, there is bleed over in your plumbing.
Verify turbine spins freely.
Measure the resistance of the water ow control sensor.
If the display is blank and clicking is coming from the unit, disconnect the water ow servo
motor (GY, BR, O, W, P, BL, R). If the display comes on replace the water ow servo motor.