VOKERA Hydra Installation & Servicing Instructions Manual - page 28
26
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
1st digit
Right
0
CH inlet temp.
1
Flow temperature
2
Flow temperature
3
Flow temperature
4
Flow temperature
5
Flow temperature
6
Flow temperature
7
Flow temperature
8
Flow temperature
9/b
Flow temp./temporary fault code
H
Flow temperature
L
Flow temperature
A
Flow temperature
t
Flow 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.
●
Using the procedure detailed in section 7.4,
change the fan speed momentarily from
minimum to maximum, then back to minimum.
●
Check that the correct value is still being
obtained. If not, repeat the above procedure.
7.4.2
MAXIMUM SETTING
The maximum setting must only be checked and/
or adjusted after the correct minimum setting has
been verified. Using the procedure detailed in
section 7.4, change the power from minimum to
maximum.
With the boiler operating at maximum output the
CO2 reading should be 9.8% (+/- 0.2%). If the
CO2 reading is correct, press the
+
and
-
buttons at the same time to return to the normal
operating mode . If the CO
2
reading is incorrect,
the maximum gas pressure must be adjusted as
follows:
●
Using a suitable screwdriver, very slowly turn
the maximum adjustment screw (fig. 33) –
clockwise to increase, counter clockwise to
decrease – until the correct value is displayed
on the CO
2
analyser (allow time for the analyser
to stabilise).
●
Using the procedure detailed in section 7.4,
change the power momentarily from maximum
to minimum, then back to maximum.
●
Check that the correct value is still being
obtained. If not, repeat the above procedure.
●
Press the
+
and
-
buttons at the same
time to return to the normal operating mode.
Isolate the appliance from the electrical supply
and remove the analyser test probe from the
analysis test point and refit cap. Refit the air
chamber cover. Refit appliance casing.
NOTE
You should ensure that all radiators or heat
emitters are fully open during the above
procedures. This will ensure that the fan speed
(output) of the boiler is not compromised due to a
high flow temperature.
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.
Fig. 33
Maximum
screw
Minimum
screw
Status
Standby
Purge
Ignition
CH mode
DHW mode
Waiting for fan
Built-in delay
CH over-run
DHW over-run
Temporary fault
condition
Combustion test at
maximum output
Combustion test at
minimum output
3-way valve operation
Manual operation of
fan
Code
E 00
E 02
E 03
E 04
E 05
E 06
E 07
E 11
E 12
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 33
E 36
E 37
E 38
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)
Under-floor system temperature fault
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
Short circuit on inlet sensor
Open circuit on flow sensor
Open circuit on return sensor
Open circuit on inlet sensor
Internal fault (PCB)
Parameter anomaly
Not enough fan driving force