Fault Finding - Potterton HE Plus Installation & Service Instructions Manual

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
Central Heating NTC Fault
E20
E28 Flue NTC Fault
E110 Safety Thermostat Operated
E119 Water Pressure Switch Not Operated
E125 Circulation Fault (Primary Circuit)
E130 Flue NTC Operated
Interruption Of Gas Supply or Flame Failure
E133
E160 Fan or Fan Wiring Fault
E193 Pre-Circulation Fault
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© Baxi Heating UK Ltd 2007
Supplied By www.heating spares.co Tel. 0161 620 6677

18.0 Fault Finding

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'. E20 is shown as 'E' then '20'
E20 and E28 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 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.