Installation Sheet

62 Rinnai Tankless Water Heater Installaon and Operaon Manual
63
Recirculaon Low Flow
• Ensure bypass plug is removed and bypass lter is installed.
(COV Mode)
• Ensure both the inlet water lter and bypass lter are clean
and free of debris.
• Ensure Parameter seng are correctly set for recirculaon
mode.
• Ensure Pump supply voltage.
• Ensure air is removed from the recirculaon line.
65
Water Flow Control
• Measure resistance values of the water ow control.*
• The water ow control valve has failed to close during the
bath ll funcon. Immediately turn o the water and
disconnue the bath ll funcon. Contact a licensed
professional to service the appliance.
70
PC Board
• Replace PC Board
71
Solenoid Valve Circuit
• Ensure dip switch on PC board is in the OFF posion.
• Ensure gas control wire is not loose or damaged.
• Ensure heater circuit is not grounded.
• Replace PC Board.
72
Flame Rod
• Check ame rod and wire for damage.
• Verify HEX is not leaking.
55
(SS) Service Soon (Flush Heat Exchanger)
• 55 is a me-based service indicator set during installaon.
See secon “3.12 Parameter Sengs” for addional details
on seng and changing the 55 indicator.
• 55 indicates that it is me for service. The heat exchanger
should be ushed to prevent damage (refer to secon “5.3
Flushing the Heat Exchanger” for more informaon). Hard
water must be treated to prevent scale build-up or damage
to the heat exchanger.
• To reset the 55 code, push the On/O buon on the
temperature controller 5 mes in 5 seconds.
NO CODE - Nothing happens when water ow is
acvated
• Verify you have at least the minimum ow rate required to
re unit.
• Measure the resistance of the water ow control sensor.*
• Clean inlet water supply lter.
• On new installaons ensure hot and cold water lines are not
reversed.
SE
Cascade Diagnosc Display (Commercial units only)
• With cascade connecons, display will ash between “SE”
and the selected set temperature when an error code is
displayed on any secondary unit .
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)
• Conrm wire connecons and harness are good.
• Ensure condensate reservoir is empty and condensate
pump is operang.
32
Outgoing Thermistor
33
Heat Exchanger Thermistor
• Check sensor wiring for damage.
• Measure resistance of sensor.*
• Clean sensor of scale build-up.
• Replace sensor.
38
Exhaust Thermistor
41 Freeze Protecon Thermistor
• Check sensor wiring for damage.
• Measure resistance of sensor.*
• Replace sensor.
51 Inlet Thermistor
• Check sensor wiring for damage.
• Measure resistance of sensor.*
• Clean sensor of scale build-up.
• Replace sensor.
52
Gas Valve
• Check ame 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 ns are clean and not blocked.
• Conrm inlet water temperature is not too high.
• Clear diagnosc code by reseng the main power supply
to the water heater.
61
Combuson Fan
• Check the motor wire harness for loose or damaged
connecons.
• Measure resistance of motor wire harness. *
• Ensure the combuson fan spins freely.
FF
Maintenance Indicator
1
2
3
FF
• Placeholder in Diagnosc code history indicang that a service provider
performed maintenance or service.
• Enter this code aer performing service by pressing (Up) , (Down)
and On/O simultaneously.
• FF is visible on the monitor.
* See “Electrical Diagnoscs” on Technical Data Sheet located on inside front cover of water heater.