Installation Guide

102 Rinnai I-Series Condensing Boiler Combi Manual
430
High/Low Water Pressure
• If the water pressure is too low, add
water into the system unl at least 13
PSI is observed.
• Ensure there are no leaking components
in the CH system.
• If the pressure is too high, adjust the
pressure to a maximum of 30 PSI.
• Ensure the pressure relief valve and
water ll are working correctly.
443
Low Water Cut-O (LWCO)
• Ensure the LWCO device is working
correctly.
• Ensure the LWCO jumper is connected
properly when LWCO is not in use.
• Ensure the output is 24 VAC on the PCB.
If it is not, check the transformer
harness and output of transformer.
520
Solenoid Valve Circuit
• Check the ame rod and wire for
damage.
• Close the gas shut o valve installed
near the boiler.
• Ensure the ame rod and wire are not
wet.
• Check the output from the PC Board to
the solenoid gas valve.
• If the output from the PC Board is
abnormal, replace the PC Board.
• If the output from the PC Board is
normal, replace the gas control.
540
High Exhaust Temperature
• Check the exhaust thermistor wiring for
damage.
• Clean the surface of the thermistor.
• Measure the resistance of the exhaust
thermistor.*
• If the sensor has been replaced and the
error sll appears, check the return
thermistor.
• If the boiler is used in a hard water area,
ush the DHW plate heat exchanger.
• Check the exhaust duct, seal, and
venng for damage.
610
Combuson Fan
• Check the motor wire harness for loose
or damaged connecons.
• Measure resistance and voltage of
motor wire harness.*
• Ensure the combuson fan spins freely.
* See “Electrical Diagnoscs” on Technical Data Sheet located on inside front cover of boiler.
631
DHW Recirculaon Pump
• Ensure the DHW recirculaon matches
the Parameter 12 seng.
• Ensure the dedicated return line is
properly installed.
• Ensure the inlet water lter and bypass
lter are clean and free of debris.
• Ensure the DHW recirculaon pump is
connected to the DHW Pump Terminal.
• Ensure the capacity of the recirculaon
pump is sized appropriately for the
piping (DHW recirculaon pump should
be higher than 1.3 GPM).
• Ensure air is removed from the
recirculaon line.
651
Water Flow Control
• Measure the resistance values and
voltage of the water ow control.*
• Ensure the harness and connector are
not wet.
• If the voltage from the PC Board is
abnormal, replace the PC Board;
otherwise, replace the water ow servo
valve.
661
Bypass
• Measure the resistance values and
voltage of the bypass servo valve.*
• Ensure the harness and connector are
not wet.
• If the voltage from the PC Board is
abnormal, replace the PC Board;
otherwise, replace the bypass servo
valve.
670
3-Way Valve
• Check the CH system water quality.
• Measure the resistance values and
voltage of the 3-way valve control.*
• Replace the 3-way valve control device.
681
Hot Water Supply Temperature
Abnormality
• If the DHW water temperature is higher
than the set point temperature because
the boiler bypass servo fails to close.
• Measure resistance values and voltage
of the bypass ow control.*
• Replace the bypass ow control device if
needed; otherwise, check the inlet
thermistor and heat exchanger
thermistor wiring for damage.
• Measure the resistance of the sensor.
• Replace if needed.
• Clean the sensor of any scale buildup
present.