Rinnai Tankless Water Heater Installation and Operation Manual
78
* See “Electrical Diagnostics” on Technical Data
Sheet located on inside front cover of water heater.
15
Venturi Control
•
Ensure the Venturi motor is operating
correctly.*
•
Replace gas valve assembly.
•
Clear diagnostic code by resetting the
main power supply to the water heater.
16
High Outgoing Temperature
(safety shutdown because water heater
is too hot)
•
Confirm fan motor is functioning
correctly.
•
Replace the gas valve assembly.
17
Venturi Blockage
•
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.
19
Electrical Grounding
•
Check all components for electrical
short.
21
Data Transfer Error
•
If the PCB has been replaced, ensure
the data transfer process has been
completed.
25
Condensate Pump (Accessory)
•
Confirm wire connections and harness
are good.
•
Ensure condensate reservoir is empty
and condensate pump is operating.
32
Outgoing Thermistor
•
Check sensor wiring for damage.
•
Measure resistance of sensor.*
•
Clean sensor of scale build-up.
• Replace sensor.
33
Heat Exchanger Thermistor
•
Follow the steps above for Code 32 for
troubleshooting.
38
Exhaust Thermistor
•
Check sensor wiring for damage.
•
Measure resistance of sensor.*
• Replace sensor.
41
Freeze Protection Thermistor
•
Follow the steps above for Code 38 for
troubleshooting.
51
Inlet Thermistor
•
Check sensor wiring for damage.
•
Measure resistance of sensor.*
•
Clean sensor of scale build-up.
• Replace sensor.
52
Gas Valve
•
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
54
High Exhaust Gas Temperature
•
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.
61
Combustion Fan
•
Check the motor wire harness for
loose or damaged connections.
•
Measure resistance of motor wire
harness.*
•
Ensure the combustion fan spins
freely.
63
Recirculation Low Flow
•
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.
65
Water Flow Control
•
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.
70
PC Board
• Replace PC Board
