Rinnai I Series Installation And Operation Manual page 102

430
High/Low Water Pressure
•
If the water pressure is too low, add
water into the system until 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 fill are working correctly.
443
Low Water Cut-Off (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 flame rod and wire for
damage.
•
Close the gas shut off valve installed
near the boiler.
•
Ensure the flame 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 still appears, check the return
thermistor.
•
If the boiler is used in a hard water area,
flush the DHW plate heat exchanger.
•
Check the exhaust duct, seal, and
venting for damage.
610
Combustion Fan
•
Check the motor wire harness for loose
or damaged connections.
•
Measure resistance and voltage of
motor wire harness.*
•
Ensure the combustion fan spins freely.
* See "Electrical Diagnostics" on Technical Data Sheet located on inside front cover of boiler.
102
631
DHW Recirculation Pump
•
Ensure the DHW recirculation matches
the Parameter 12 setting.
•
Ensure the dedicated return line is
properly installed.
•
Ensure the inlet water filter and bypass
filter are clean and free of debris.
•
Ensure the DHW recirculation pump is
connected to the DHW Pump Terminal.
•
Ensure the capacity of the recirculation
pump is sized appropriately for the
piping (DHW recirculation pump should
be higher than 1.3 GPM).
•
Ensure air is removed from the
recirculation line.
651 Water Flow Control
•
Measure the resistance values and
voltage of the water flow 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 flow 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.
Hot Water Supply Temperature
681
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 flow control.*
•
Replace the bypass flow 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.
Rinnai I-Series Condensing Boiler Combi Manual