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WARNING
The list of error codes with occurrence day and time and with clear date and time are saved in the History page.
This information can be accessed via the boiler controller by clicking on VIEW - History.
Error
Message
Code
Outdoor sensor fault
10
(B9)
Boiler Supply
temperature sensor
20
fault (B2)
Cascade temperature
26
sensor fault (B10)
40
Some of the checks below should be performed by a licensed professional.
Consumers should never attempt any action that they are not qualified to perform.
NOTE: The numbers in parenthesis are diagnostic codes associated with each
The error will auto-reset once the issue is resolved (610)
NOTE: This error code does not prevent boiler operation; However, it will
prevent any other error codes to show on the home page.
1- Check the outdoor sensor connection to ensure it is not open or not
connected (if not connected, the jumper should remain in place - supplied from
the factory) - check continuity
2- Check outdoor sensor wiring to ensure it is connected properly (1 kOhm
sensor supplied from the factory) - check continuity
3- Check the resistance of the outdoor sensor and compare to the value shown
on the resistance value table
4- Replace the outdoor sensor if malfunction is detected
5- If the issue persists, replace the main control board
The error will auto reset once the issue is resolved (unless the diagnostic code is
2- manual reset required)
1- Check supply temperature sensor wiring to ensure it is connected properly
(10 kOhm sensor) - check continuity
2- Check supply temperature sensor to ensure it is not short or open (2)
3- Check the resistance of the supply temperature sensor and compare to the
value shown on the resistance value table (737, 591, 249, 552)
4- Replace the supply temperature sensor if malfunction is detected.
5- If the issue persists, replace the main control board
The error will auto-reset once the issue is resolved
NOTE: This error code does not prevent boiler operation; However, it will
prevent any other error codes to show on the home page.
1- Check cascade temperature sensor wiring to ensure it is connected properly
(10 kOhm sensor)
2- Check cascade temperature sensor to ensure it is not short or open
3- Check the resistance of the cascade temperature sensor and compare to the
value shown on the resistance value table 4. The cascade temperature sensor is
ONLY required on the Master boiler. Confirm the cascade address is set
correctly. Ensure the cascade sensor is set correctly on SETUP - cascade setup
page. If everything is set correctly, use the save sensor option on SETUP -
system setup to configure this sensor.
4- Replace the supply temperature sensor if malfunction is detected.
5- If the issue persists, replace the main control board
Remedies
error codes
Rinnai Commercial Boiler User Manual
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