When the boiler does not operate properly and ‘Error code’ displays, check the
troubleshooting chart below. (Check the figures on the left on the display)
Self-Diagnosis Operation State Possible Cause
What to do
CH
CH & DHW
CH & DHW
CH & DHW
CH & DHW
CH & DHW
CH & DHW
CH & DHW
Power
Connection
CH & DHW
Test
Operation
CH & DHW
Frozen prevention
/Thermistor
malfunction
Short of water
Neutral fluid full
level detection
Abnormal supplied
gas pressure
Gas governor
control malfunction
Fan control
malfunction
Abnormal
solenoid
Short of water
Complete frozen
detection
Fan rotation
detection malfunction
DHW test operation
malfunction detection
Exhaust blockage
Press either CH mode or DHW mode button to turn it off and then,
turn it on again.
When the same condition is repeated, contact the Rinnai service.
Refer to p.52 water feeding process.
Check to ensure that neutral fluid outlet pipes are not twisted or
blocked.
Check to ensure that gas valves are completely opened.
Turn off CH and DHW mode operations and then, turn it on
again.
When the same condition is repeated, contact the Rinnai service.
Press either CH or DHW mode button to turn it off and then,
turn it on again.
When the same condition is repeated, contact the Rinnai service.
Check the exhaust installation condition (blockage, twist)
Turn off the boiler and then, turn it on again.
When the same condition is repeated, contact the Rinnai service.
Press either CH or DHW mode button to turn it off and then,
turn it on again.
When the same condition is repeated, contact the Rinnai service.
Press either CH or DHW mode button to turn it off and then,
turn it on again.
When the same condition is repeated, contact the Rinnai service.
Defrost it using CH apparatus and then, exchange the
damaged components.
When there is a leakage due to damaged components, contact
the Rinnai service.
Turn off the CH mode operation and then, turn it on again.
Check the installation, condition, blockage, and damage of the
exhaust.
Contact the Rinnai service.
Check to ensure that the water supply valve is opened.
Unplug it first and then, plug it again and start the test operation
again.
Check the installation, condition, blockage, and damage of the
exhaust.
Contact the Rinnai service.
Basic troubleshooting
21
DHW
CH
34
35
DHW thermistor
malfunction
Space temperature
manfunction
Press either CH or DHW mode button to turn it off and then,
turn it on again.
When the same condition is repeated, contact the Rinnai service.
Contact to Rinnai service agent and change the CH mode to how
temperature.
21
Summary of Contents for R331
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