6. Fault Finding Guide
Boiler Fault Finding
NOTE:
When instructed to turn the
selector to the reset position turn the
selector switch fully anticloc
k
wise
against the spring pressure to the reset
position and hold for
5
seconds to reset
the boiler.
Initial Fault Finding Checks
1
.
C
hec
k
that gas, water and electrical supplies
are available at the boiler.
2. Electrical supply = 230V ~
5
0 Hz.
3.
C
H water system pressurised to 0.
5
bar
minimum when the boiler is cold.
4. The preferred minimum gas pressure is 20
mbar.
5
.
C
arry out electrical system chec
k
s, i.e. Earth
C
ontinuity, Resistance to Earth, Short
C
ircuit and
P
olarity with a suitable meter.
NOTE:
These chec
k
s must be repeated after
any servicing or fault finding.
6. Ensure all external controls are calling for heat
and chec
k
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
E
1
33 will be displayed by
'
E
1'
alternating with
'
33
'
.
E
5
0 is shown as
'
E
'
then
'5
0
'
E20, E2
8
& E
5
0 indicate faulty components or
wiring harness.
E
11
0 shows overheat of the primary water and
E
1
30 overheat of the flue system.
E
11
9 is displayed when the primary water
pressure is less than 0.
5
bar.
E
1
33 indicates that the gas supply has been
interrupted, ignition has failed or the flame has
not been detected.
E
1
2
5
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
1
0 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 E
11
0,
E
1
30 & E
1
33 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.
C
entral Heating NT
C
Fault
Flue NT
C
Fault
Hot Water NT
C
Fault
Safety Thermostat Operated
Water
P
ressure Switch Not Operated
P
ump Fault or
P
rimary
C
irculation
P
roblem
Tan
k
Thermistor not in Tan
k
Flue NT
C
Operated
Interruption Of
P
ower Supply while in fault mode
Interruption Of Gas Supply or Flame Failure
Fan or Fan Wiring Fault
P
re-
C
irculation Fault
E20
E
5
0
E2
8
E
11
0
E
11
9
E
1
2
5
E
1
30
E
1
3
1
E
1
33
E
1
60
E
1
93
Table Of Error Codes
4
7
© Baxi Heating UK Ltd 2015