Rinnai Sensei CU199i Installation And Operation Manual page 78

Venturi Control
15
• Ensure the Venturi motor is operating
correctly.*
• Replace gas valve assembly.
• Clear diagnostic code by resetting the
main power supply to the water heater.
High Outgoing Temperature
16
(safety shutdown because water heater
is too hot)
• Confirm fan motor is functioning
correctly.
• Replace the gas valve assembly.
Venturi Blockage
17
• First, follow the recommended solutions
for Diagnostic Code 10.
• If the Code 10 solutions do not correct
the problem, ensure the Venturi is not
blocked.
• Please call Rinnai technical department.
Electrical Grounding
19
• Check all components for electrical
short.
Data Transfer Error
21
• If the PCB has been replaced, ensure
the data transfer process has been
completed.
Condensate Pump (Accessory)
25
• Confirm wire connections and harness
are good.
• Ensure condensate reservoir is empty
and condensate pump is operating.
Outgoing Thermistor
32
• Check sensor wiring for damage.
• Measure resistance of sensor.*
• Clean sensor of scale build-up.
• Replace sensor.
Heat Exchanger Thermistor
33
• Follow the steps above for Code 32 for
troubleshooting.
Exhaust Thermistor
38
• Check sensor wiring for damage.
• Measure resistance of sensor.*
• Replace sensor.
Freeze Protection Thermistor
41
• Follow the steps above for Code 38 for
troubleshooting.
* See "Electrical Diagnostics" on Technical Data
Sheet located on inside front cover of water heater.
Rinnai Tankless Water Heater Installation and Operation Manual
Inlet Thermistor
51
• Check sensor wiring for damage.
• Measure resistance of sensor.*
• Clean sensor of scale build-up.
• Replace sensor.
Gas Valve
52
• Check flame rod and wire for damage.
• Check gas solenoid valve for open or
short circuit.*
• Replace gas valve assembly.
• Please call Rinnai technical
department
High Exhaust Gas Temperature
54
• Ensure Heat Exchanger fins are clean
and not blocked.
• Confirm inlet water temperature is not
too high.
• Clear diagnostic code by resetting
the main power supply to the water
heater.
Combustion Fan
61
• Check the motor wire harness for
loose or damaged connections.
• Measure resistance of motor wire
harness.*
• Ensure the combustion fan spins
freely.
Recirculation Low Flow
63
• Ensure bypass plug is removed and
bypass filter is installed. (COV Mode)
• Ensure both the inlet water filter and
bypass filter are clean and free of
debris.
• Ensure Parameter setting are correctly
set for recirculation mode.
• Ensure Pump supply voltage.
• Ensure air is removed from the
recirculation line.
Water Flow Control
65
• Measure resistance values of the
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.
PC Board
70
• Replace PC Board
78