NOTE: When instructed to operate the reset button, press and hold for 5 seconds to reset the boiler.
Table Of Error Codes
E20 Central Heating NTC Fault
E28 Incorrect PCBFitted
E50 Hot Water NTC Fault
E110 Safety Thermostat or Condensate Safety Float Switch Operated
E125 Circulation Fault (Primary Circuit)
E131 Interruption Of Power Supply while in fault mode
E133 Interruption Of Gas Supply or Flame Failure
E155 Lock Out of Boiler Control
E158 Condensate Discharge System Fault
E160 Fan or Fan Wiring Fault
Service Reset
To perform a Service Reset it is necessary to have access to the boiler. By pressing the Reset rocker switch on the right of the boiler case for a minimum of 5 seconds when error codes are displayed it is possible to reset the boiler once the fault has been rectified.
Restoring Boiler Control Default
Following a Service Reset it is necessary to restore the Boiler Control to default condition:-
Disconnect the main power supply
On reinstating the power supply the Boiler Control display will count down from 7.
Before the count reaches 3 press both the ‘On/Off’ and ‘Reset’ buttons simultaneously and hold until the count reaches 0.
The Boiler Control display will show ‘SEt’ to confirm default restoration.
12.0Fault Finding
12.1Initial Fault Finding Checks
1.Check that gas, water and electrical supplies are available at the boiler.
2.Electrical supply = 230V ~ 50 Hz. Check the CH &DHW system. The preferred minimum gas pressure is 20 mbar.
3.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.
4.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.
12.2Error Codes
1.If a fault occurs on the boiler an error code may be shown on the boiler display and the Boiler Control.
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 & E28 indicate faulty or incorrect components.
E110 shows overheat of the primary water or excess condensate in the sump.
E125 is displayed if within 2 hours of the burner lighting the boiler temperature twice exceeds the selected temperature by 25°.
In these instances poor primary circulation or no water in the system is indicated.
E133 indicates that the gas supply has been interrupted, ignition has failed or the flame has not been detected.
E155 indicates a Boiler Control reset when Service &Boiler Control reset counters are out of step. Boiler Control default not restored correctly.
E158 indicates a condensate discharge system fault.
3.By pressing the 'Reset' button on the Boiler Control for a minimum of 5 seconds when E110 & 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. It is possible to reset the boiler up to 4 times in any 5 hour period. Further resets via the Boiler Control are then blocked for 5 hours unless a Service Reset is performed.
34© Baxi Heating UK Ltd 2009