10 Troubleshooting
10.1 Error codes
10.1.1 Initial error fault finding checks
Check that gas, water and electrical supplies are available at the boiler.
Electrical supply = 230V ~ 50 Hz.
The minimum gas pressure at the meter is 19mb.
Carry out electrical system checks, i.e. Earth Continuity, Resistance to
Earth, Short Circuit and Polarity with a suitable meter.
Ensure all external controls are calling for heat and check all external
and internal fuses.
Important
These checks must be repeated after any servicing or fault find
ing.
10.1.2 Display of error codes
If a fault occurs on the boiler an error code may be shown by the display
screen.
The codes are a flashing number, either two or three digit, preceded by
the symbol :-
followed by 20, 28, 40, 160 or 321 indicates possible faulty compo
nents.
110 indicates overheat of the primary system water.
118 is displayed when the primary water pressure is less than 0.5
bar.
133, 134 and 135 indicates that the gas supply has been interrup
ted, ignition has failed or the flame has not been detected.
128 is displayed if there has been a flame failure during normal op
eration.
125 is displayed in either of two situations:-
If between 15 and 30 seconds of the burner lighting, the primary
water temperature has not changed by 1° C.
If within 10 minutes of the burner lighting, the primary water tem
perature actual temperature twice exceeds the selected temper
ature by 30°. In these instances poor primary circulation is indi
cated.
By pressing the
Reset
button for 1 to 3 seconds when 09, 15, 110, 125,
128, 133, 134, 135, 384 are displayed it is possible to relight the boiler.
If this does not have any effect, or the codes are displayed regularly fur
ther investigation is required.
Fig.64
Display of error codes
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10 Troubleshooting
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7678846 - A - 22052017
