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18.0 Fault Finding
© Baxi Heating UK Ltd 2012
Refer to Section 16.0 “Illustrated Wiring Diagram” for position of terminals and components
Central Heating - Follow operational sequence
Turn selector switch to
The display illuminates
Error 20, 28 or 50 flashing
Error 119 flashing
Burner lights
Error 110 flashing
Error 130 flashing
Error 133 flashing
Turn Central Heating
thermostat to Maximum.
Pump runs
Fan runs
Spark at ignition electrodes for
up to 5 seconds and for 3
attempts
3-way valve is open to Central
Heating circuit
Go to section ‘A’
Go to section ‘E’
Ensure all controls (and
integral clock if fitted) are
calling for heat
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
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
Burner goes out
Go to section ‘C’
Ensure controls are set to
demand and verify the
contacts are closed
Error 160 flashing
Go to section ‘L’
YES
Go to section ‘H’
Turn the selector switch to
reset
Go to section ‘F’
Error 130 flashing
Go to section ‘M’
YES
Check the Central Heating
NTC sensor
Go to section ‘E’
Fan stops after 10 seconds
Pump continues to run for 3
minutes
(room thermostat open)
NO
NO
YES
NO
YES
YES
Turn the selector switch to
reset position for 5 seconds
NO
Error 125 or 193 flashing
Ensure that primary
circulation is OK & that
there is no blockage
YES