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10.17 Fault codes display
The following graphs describe the lock out codes of the boiler. A lock out code can only be removed by a manual
resetting of the boiler. NOTICE: Before resetting the boiler always check the boiler, central heating system and all
components corresponding to the related lock out description. Never just reset the boiler, before analysing the
possible cause of failure.
10.17.1 L
OCK
-
OUT CODES
Having a lockout means that the boiler needs a manual reset to start operating again.
When the boiler is in lockout the backlight of the display is blinking on and off.
Explanation >
9 9 9 , 5 : h r s
= time elapsed after fault & message.
Explanation >
P u m p 1
o n
= status of the pump during fault.
Display message
F18
A P S
s w i
t c h
p u m p 1
o n
9 9 9 , 5
h r s
Reason
Air pressure switch is activated and exceeds the fixed period.
Or combination of NRV blocking and an F11 lock out.
Display message
F15
C l
i x o n
F a u l t
p u m p
o n
9 9 9 , 5
h r s
Reason
Heat exchanger fuse or burner door clixon exceeded maximum allowed value.
Display message
F10
F a l s e
f
l a m e
s i g n a l
p u m p
o n
9 9 9 , 5
h r s
Reason
Flame signal is detected while it cannot be expected.
Display message
F8
F a i
l e d
b u r n e r
s t a r
t
p u m p
o n
9 9 9 , 5
h r s
Reason
Boiler is not starting after the programmed starting attempts.
Display message
F11
F a n
s p e e d
i n c o r r e c t
p u m p
o n
9 9 9 , 5
h r s
Reason
The controller does not detect a correct fan speed.
Display message
F9
F l a m e
l o s t
p u m p
o n
9 9 9 , 5
h r s
Reason
Flame detected during normal operation, but was lost while running.
Display message
F1
F l o w
h i g h
T e m p
p u m p
o n
9 9 9 , 5
h r s
Reason
Flow temperature exceeds the limit which has been set in the parameters.
Display message
F16
F l o w R e t u r n
d t
f a u l
t
p u m p
o n
9 9 9 , 5
h r s
Reason
Temperature difference between flow and return exceeds limitation value,
or 'dT block or delta direct block' has occurred three times.
Display message
F0
F l o w
s e n s o r
e r r o r
p u m p
o n
9 9 9 , 5
h r s
Reason
Flow sensor not detected by the boiler caused by faulty connection/sensor.
Display message
F6
F l u e
s e n s o r
e r r o r
p u m p
o n
9 9 9 , 5
h r s
Reason
Flue gas sensor not detected by the boiler caused by faulty connection/sensor.