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18.0 Fault Finding
© Baxi Heating UK Ltd 2011
Turn selector switch to
The display illuminates
Error 20, 28 or 50 flashing
Error 119 flashing
Burner lights
Error 110 flashing
Error 133 flashing
Turn Domestic Hot Water
thermostat to Maximum.
Open DHW tap fully.
DHW Hall Effect sensor
operated (red neon on the
sensor illuminated
Fan runs
Spark at ignition electrodes for
up to 5 seconds and for 3
attempts
3-way valve is open to
Domestic Hot Water circuit
Go to section ‘A’
Go to section ‘E’
Is mains water filter and
assembly clean?
Is the magnetic detector free
to move in the Hall Effect
sensor
Go to section ‘K’
Go to section ‘B’
Error 160 flashing
Go to section ‘D’
Error 133 flashing
Burner does not stay alights
after 5 seconds
Error 133 flashing
Go to section ‘I’
Operation sequence
successful
Turn the selector switch to
reset position for 5 seconds
If the error 110 is still flashing.
Go to section ‘J’
Fan runs at correct speed
YES
YES
NO
NO
NO
YES
YES
YES
YES
YES
YES YES
YES
NO
YES
YES
YES
YES
NO
NO
NO
NO
NO
Burner output modulates to
maintain the temperature set
DHW flow sensor senses no
flow. Burner goes out
Go to section ‘C’
DHW flow rate more than 2
l/min
Error 160 flashing
Go to section ‘L’
YES
Go to section ‘H’
Turn the selector switch to the
reset position for 5 seconds
Go to section ‘F’
Error 130 flashing
Go to section ‘M’
YES
Reduce DHW flow rate
Burner modulates
Fan stops after 10 seconds
Pump runs for 30 seconds
NO
YES
NO
YES
YES
Domestic Hot Water - Follow operational sequence
Pump runs
YES
Error 125 flashing
Go to section ‘B’
NO
Close DHW tap
YES
NO
YES
Clean DHW NTC sensor
and DHW heat exchanger
NO