16.0 FAULT FINDING
46
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.
Carry out 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.
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 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 the pump is probably inoperative.
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
Pump Fault
Flue NTC Operated
Interruption Of Gas Supply or Flame Failure
Fan or Fan Wiring Fault
E20
E50
E28
E110
E119
E125
E130
E133
E160
Table Of Error Codes
Publication No. 5116282
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