Baxi Luna HT Troubleshooting Guide
5
E133
Burner Lockout
Weak Spark:
1-
Make sure you have 3-5 sparks per second and the boiler is grounded
2-
Make sure the spark generator is fastened tightly to the mounting bracket
3-
If a weak spark persists follow the procedure outlined in the "No Spark" section
No Flame:
1-
Ensure that all gas shutoffs are open and that adequate working gas pressure is
coming to the unit. Refer to the installation manual for gas specifications.
2-
Ensure the silicon tube going from the fan to the gas valve is secure and does not
have any moisture or holes in it.
3-
Check for 120 V going to coils 1 and 2 on the gas valve
4-
If converting to propane gas, try turning the "V" screw (High Fire Adjustment)an
additional half to full turn counterclockwise
If there is voltage to the gas valve replace the gas valve. If there is no voltage to the gas valve
replace the main control board.
Flame Sensor is not sensing:
1-
Check polarity and ground from the boiler back to the circuit breaker
2-
Check for 3-5 micro amps going to the board
3-
If you do not have 3-5 micro amps try cleaning the flame sensor
Note:
Do not clean the flame sensor using sandpaper as it may damage the protective
coating. If the sensor is dirty check you’re venting to ensure you are not recycling products
of combustion. Also ensure that your QAA73 parameters are correct for the type of gas you
are using.
NOTES:
E160
Fan Speed Thresholds not
Reached
1-
Check QAA73 fan speed parameters values have been adjusted with respect to gas
type, venting length and altitude. Refer to installation manual for values
If the fan speed parameters are correct then replace the fan.
NOTES:
E168
Communication Lockout
1-
Ensure that the boiler is operating on a dedicated circuit, proper polarity and
grounding
2-
Check the grounds on the internal pump, gas valve and fan
3-
Check for water on the board
4-
Unplug the boiler for 20 minutes and disconnect all external controls including the
QAA73. Plug the boiler back in and use a jumper at the M1 block on terminals 1 and
2 to call the boiler on. If an E168 persists replace the main control board.
5-
If the boiler fire's up make sure all secondary pumps and controls are grounded and
connect them again one by one
6-
If at any point while reconnecting the error code reappears, look for a bad ground or
electrical error on that particular device.
NOTES:
