60
KBD Series Manual
Code
Definition
Remedy
19
Electrical Grounding
licensed
professional
only
Check all components for electrical short.
25
Condensate Trap is full
Check condensate trap and drain line for blockage.
licensed
professional
only
Replace condensate trap.
31
Burner Sensor
Measure resistance of sensor.
Replace sensor.
32
Outgoing Water
Temperature Sensor
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build-up.
Replace sensor.
33
Heat Exchanger Outgoing
Temperature Sensor
41
Outside Temperature
Sensor
51
Inlet Water Temperature
Sensor
52
Modulating Solenoid Valve
Signal
Check modulating gas solenoid valve wiring harness for loose or damaged terminals.
Measure resistance of valve coil.
57
Burner
Contact a licensed professional.
58
Secondary heat exchanger
There is scale build up in the secondary heat exchanger and it 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.
61
Combustion Fan
Ensure fan will turn freely.
Check wiring harness to motor for damaged and/or loose connections.
Measure resistance of motor winding.
65
Water Flow Control
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.
70
PC Board
Check PC board DIP switches for correct position.
Check the connection harness at the connection on the PC board.
Replace PC board.
71
Solenoid Valve Circuit
Replace the PC Board.
72
Flame Sensing Device
Replace the PC Board.
73
Burner Sensor Circuit
Check sensor wiring and PC board to be sure that they have not been damaged.
Replace sensor.
LC #
(LC0,
LC1,
LC2,…)
Scale Build-up in Heat
Exchanger (when 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 on the temperature controller 5 times. Repeated LC codes will eventually lockout
the water heater.
Please call Rinnai technical department.
FF
Maintenance has been
performed
Indicates a licensed professional performed maintenance or corrected an issue.
No
code
Nothing happens when
water flow is activated.
Clean inlet water supply filter.
On new installations ensure hot and cold water lines are not reversed.
Verify you have at least the minimum flow rate required to fire unit.
licensed
professional
only
Check for cold to hot cross over. Isolate circulating system if present. Turn off cold water to the
unit, open pressure relief valve; if water continues to flow, there is bleed over in your plumbing.
Verify turbine spins freely.
Measure the resistance of the water flow control sensor.
If the display is blank and clicking is coming from the unit, disconnect the water flow servo
motor (GY, BR, O, W, P, BL, R). If the display comes on replace the water flow servo motor.
