Baxi Luna HT Troubleshooting Guide
3
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
Code
Description
Solution
E10
Outdoor Temperature
Sensor fault
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.
NOTES:
E20
CH NTC Sensor Fault
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.
NOTES:
E50
DHW NTC Sensor Fault
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.
NOTES:
E110
High Limit Temperature
Sensor Activating
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 (0Ω indicates the sensor is closed, OL
indicates the sensor is open)
5-
If an E110 error code persists change the high limit sensor.
NOTES:
