Technical data

24
1
st
digit
shows
1
2
3
4
5
6
Right display
shows
Most recent fault code
Appliance status at time of fault
Flow sensor temperature at time of fault
Return sensor temperature at time of fault
N/A
N/A
Code
b 18
b 19
b 24
b 25
b 26
b 28
b 29
b 30
b 65
Reason
Flow sensor above 95 °C
Return sensor above 95 °C
Temperature differential inverted
Excessive temperature rise
Condensate trap blocked
No signal from fan
Incorrect signal from fan
Temperature differential exceeded
Insufficient fan speed for ignition
Status
Standby
Purge
Ignition
Burner on
Waiting for fan
Built-in delay
Pump over-run
Temporary fault
condition
Combustion test at
maximum output
Combustion test at
minimum output
Anti seizing cycle
Manual operation of
fan
1st digit
0
1
2
3
5
6
7
9/b
H
L
A
t
Right
Flow temperature
Flow temperature
Flow temperature
Flow temperature
Flow temperature
Flow temperature
Flow temperature
Flow temp./temporary fault
code
Flow temperature
Flow temperature
Flow temperature
Flow temperature
Code
E 00
E 02
E 03
E 04
E 05
E 06
E 07
E 11
E 13
E 14
E 15
E 16
E 17
E 18
E 19
E 25
E 28
E 29
E 30
E 31
E 32
E 36
E 37
E 44
E 60
E 65
Reason
False flame
No flame detected
Internal fault (PCB)
Appliance lockout and power failure
Internal fault (PCB)
Internal fault (PCB)
Internal fault (PCB)
Internal fault (PCB)
Internal fault (PCB)
Internal fault (PCB)
Internal fault (PCB)
Internal fault (PCB)
Internal fault (PCB)
Flow sensor temperature exceeded
Return sensor temperature exceeded
Excessive temperature rise
No signal from fan
Incorrect signal from fan
Temperature differential exceeded
Short circuit on flow sensor
Short circuit on return sensor
Open circuit on flow sensor
Open circuit on return sensor
Internal fault (PCB)
Parameter anomaly
Not enough fan driving force
7.8 DIAGNOSTIC RECALL
In addition to displaying a fault code, the appliance
memorises the operating conditions at the time of
lockout, this information can be recalled and
displayed using the following procedure:
● access the appliance service mode as detailed
in section 5.10
● press the
mode
button until “ERRO” appears
in the display
● press the
S
button to recall the information
as detailed below
● press the
reset
button to exit the appliance
service mode.
7.9 CHECKING THE EXPANSION VESSEL
Carry out the component removal procedure as
described in section 6.4. You must ensure that
the boiler is completely drained of water.
Using a suitable pressure gauge, remove dust
cap on expansion vessel and check the charge
pressure. The correct charge pressure should be
1.0 bar ± 0.1 bar. If the charge pressure is less,
use a suitable pump to increase the charge.
Please note, you must ensure the safety valve is
in the open position whilst re-charging takes
place. Replace the dust cap and carry out the
relevant commissioning procedure.
7.5 1
ST
DIGIT STATUS CODE
When the boiler is operating normally (without
fault), the first digit of the display shows the
current status of the boiler whilst the right side will
show the relevant temperature.
7.6 TEMPORARY FAULT CODES
The built-in fault diagnostic system automatically
displays a unique fault code that can be used to
determine why the boiler has temporarily locked
out.
7.7 FINAL FAULT CODES
When a volatile lockout condition occurs, or a
temporary fault condition has not been corrected,
the appliance will be permanently locked out and
a manual reset will be required.
Fig. 30
Maximum
screw
Minimum
screw