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Baxi Luna HT Troubleshooting Guide
Baxi Luna HT Troubleshooting Guide
Note: It is recommended that a combustion analyzer test be performed at every visit and that the proper adjustments are made if
necessary.
Error
Description
Code
Outdoor Temperature
E10
Sensor fault
NOTES:
E20
CH NTC Sensor Fault
NOTES:
E50
DHW NTC Sensor Fault
NOTES:
High Limit Temperature
E110
Sensor Activating
NOTES:
1-
Disconnect the outdoor temperature sensor and take an ohm reading using chart B.
If the sensor is out of calibration replace it.
2-
If the Sensor is working properly replace the main control board.
1-
Take an ohm reading of the CH NTC sensor using chart A. If the sensor is out of
calibration, replace the sensor. If the sensor is working properly, replace the main
control board.
Note: The CH NTC sensor sits in a dry well and should always be covered in heat transfer
paste.
1-
Take an ohm reading of the DHW NTC sensor. If the NTC sensor is out of calibration
replace the faulty sensor.
2-
Check for a resistance in terminals 9 and 10 on the M2 connector (Only for heating
boilers)
3-
If utilizing an indirect tank sensor, take an ohm reading using chart C. If the sensor
is faulty replace it. If the sensor is working check parameter 651 on the QAA73. (For
heating only models)
4-
If problem persists replace the main control board
Note: The DHW NTC sensor is in a wet well, shutoff the cold water inlet and open a hot
water tap before replacing the sensor.
1-
Check pump to make sure it is running and not ceased.
2-
Check for restrictions
3-
Make sure that all air is purged from the system
4-
Take an ohm reading on the high limit sensor (0 indicates the sensor is closed, OL
indicates the sensor is open)
5-
If an E110 error code persists change the high limit sensor.
Solution
3
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