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© Baxi Heating UK Ltd 2009
12.0 Fault Finding
NOTE: When instructed to
operate the reset button, press
and hold for 5 seconds to reset
the boiler.
12.1 Initial 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.
12.2 Error 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.
Central Heating NTC Fault
Incorrect PCB Fitted
Hot Water NTC Fault
Safety Thermostat or Condensate Safety Float Switch Operated
Circulation Fault (Primary Circuit)
Interruption Of Power Supply while in fault mode
Interruption Of Gas Supply or Flame Failure
Lock Out of Boiler Control
Condensate Discharge System Fault
Fan or Fan Wiring Fault
E20
E28
E50
E110
E125
E131
E133
E155
E158
E160
Table Of Error Codes
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.
Service Reset
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.
Restoring Boiler Control Default