Baxi Potterton 47-393-41, 47-393-40, 47-393-39 manual Initial Fault Finding Checks, Error Codes

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.

Table Of Error Codes

E20 Central Heating NTC Fault

E28 Flue NTC Fault

E50 Hot Water NTC Fault

E110 Safety Thermostat Operated

E119 Water Pressure Switch Not Operated

E125 Circulation Fault (Primary Circuit)

E130 Flue NTC Operated

E133 Interruption Of Gas Supply or Flame Failure

E160 Fan or Fan Wiring Fault

E193 Pre-Circulation Fault

18.0Fault Finding

18.1Initial 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.

18.2Error 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.

54© Baxi Heating UK Ltd 2012