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18.0 Fault Finding
© Baxi Heating UK Ltd 2012
NOTE: When instructed to turn the
selector to the reset position turn the
selector switch fully anticlockwise against
the spring pressure to the reset position
and hold for 5 seconds to reset the
boiler.
18.1 Initial Fault Finding Checks
1. Check that gas, water and electrical supplies are available
at the boiler.
2. Electrical supply = 230V ~ 50 Hz.
3. CH water system pressurised to 0.5 bar minimum when
the boiler is cold.
4. The preferred minimum gas pressure is 20 mbar.
5. Carry out electrical system checks, i.e. Earth Continuity,
Resistance to Earth, Short Circuit and Polarity with a suitable
meter.
NOTE: These checks must be repeated after any
servicing or fault finding.
6. Ensure all external controls are calling for heat and check
all external and internal fuses. Before any servicing or
replacement of parts, ensure the gas and electrical supplies
are isolated.
18.2 Error Codes
1. If a fault occurs on the boiler an error code may be shown
by the facia display.
2. The codes are either two or three digit, preceded by the
letter 'E'. For example, code E133 will be displayed by 'E1'
alternating with '33'. E50 is shown as 'E' then '50'
E20, E28 & E50 indicate faulty or incorrect components.
E110 shows overheat of the primary water and E130
overheat of the flue system.
E119 is displayed when the primary water pressure is less
than 0.5 bar.
E133 indicates that the gas supply has been interrupted,
ignition has failed or the flame has not been detected.
E125 is displayed in either of two situations:-
i) If within 15 seconds of the burner lighting the boiler
temperature has not changed by 1°.
ii) If within 10 minutes of the burner lighting the boiler
temperature twice exceeds the selected temperature by 30°.
In these instances poor primary circulation is indicated.
3. By turning the selector switch to the 'Reset' position for a
minimum of 5 seconds when E110, E130 & E133 are
displayed it is possible to relight the boiler.
4. If this does not have any effect, or the codes are displayed
regularly further investigation is required.
Central Heating NTC Fault
Flue NTC Fault
Hot Water NTC Fault
Safety Thermostat Operated
Water Pressure Switch Not Operated
Circulation Fault (Primary Circuit)
Flue NTC Operated
Interruption Of Gas Supply or Flame Failure
Fan or Fan Wiring Fault
Pre-Circulation Fault
E20
E28
E50
E110
E119
E125
E130
E133
E160
E193
Table Of Error Codes