Rinnai RUCS65i Manuel D'installation Et D'utilisation page 58

Code Definition
19 Electrical Grounding
25 Condensate Trap is full
Outgoing Water
32
Temperature Sensor
Heat Exchanger Outgoing
33
Temperature Sensor
Exhaust Gas Temperature
38
Sensor
Outside Temperature
41
Sensor
Modulating Solenoid Valve
52
Signal
High Exhaust Gas
54
Temperature
61 Combustion Fan
65 Water Flow Control
70 PC Board
71 Solenoid Valve Circuit
72 Flame Sensing Device
Scale Build-up in Heat
LC #
Exchanger (when checking
(LC0,
maintenance code history,
LC1,
"00" is substituted for
LC2,...)
"LC")
Maintenance has been
performed
FF
(with controller only)
No Nothing happens when
code water flow is activated.
58
Remedy
licensed
professional Check all components for electrical short.
only
Check condensate trap and drain line for blockage.
Replace condensate trap.
Check sensor wiring for damage.
Measure resistance of sensor.
Clean sensor of scale build-up.
Replace sensor.
Check modulating gas solenoid valve wiring harness for loose or damaged terminals.
Measure resistance of valve coil.
Check heat exchanger surface for hot spots which indicate blockage due to scale
licensed
build-up. Refer to heat exchanger flushing instructions within this manual. Hard water
professional
must be treated to prevent scale build up or damage to the heat exchanger.
only
Contact a licensed professional.
Ensure fan will turn freely.
Check wiring harness to motor for damaged and/or loose connections.
Measure resistance of motor winding.
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.
Check PC board DIP switches for correct position.
Check the connection harness at the connection on the PC board.
Replace PC board.
Replace the PC Board.
Replace the PC Board.
LC (only when a controller is installed , the monitor shows 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 (when a controller is installed) on the temperature controller 5 times. Repeated LC
codes will eventually lockout the water heater.
Please call Rinnai technical department.
Indicates a licensed professional performed maintenance or corrected an issue.
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.
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.
licensed
Verify turbine spins freely.
professional
Measure the resistance of the water flow control sensor.
only
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.
KCM Series Manual