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16.18
FAULT CODES DISPLAY
The following graphs describe the lock out codes of the water heater. A lock out code can only be removed by a manual resetting of the water
heater. NOTICE: Before resetting the water heater always check the water heater, central heating system and all components corresponding to
the related lock out description. Never just reset the water heater, before analysing the possible cause of failure.
16.18.1 LOCK-OUT CODES
Having a lockout means that the water heater needs a manual reset to start operating again.
When the water heater is in lockout the backlight of the display is blinking on and off.
Display message
F0
Reason
Display message
F1
Reason
Display message
F1
Reason
Display message
F2
Reason
Display message
F3
Reason
Display message
F5
Reason
Display message
F6
Reason
Display message
F7
Reason
Display message
F8
Reason
Explanation > 9
9
9
Explanation > P
u
m
F
l
o
p
u
m
Flow sensor not detected by the water heater caused by faulty connection/sensor.
F
l
o
p
u
m
Flow temperature exceeds the limit as set in the parameters.
R
e
t
p
u
m
Return temperature exceeds the limit as set in the parameters.
L
a
c
p
u
m
The general required gradient water lack has failed.
R
e
t
p
u
m
Return sensor not detected by the water heater caused by faulty connection/sensor.
N
o
n
p
u
m
Contact signal of the non-return valve failed.
F
l
u
p
u
m
Flue gas sensor not detected by the water heater caused by faulty connection/sensor.
F
l
u
p
u
m
Flue gas temperature exceeds the limit which has been set in the parameters.
F
a
i
p
u
m
Water heater is not starting after the programmed starting attempts.
,
5
:
h
r
s
= time elapsed after fault & message.
p
1
o
n
= status of the pump during fault.
w
s
e
n
s
o
p
o
n
w
h
i
g
h
p
o
n
u
r
n
h
i
g
p
o
n
k
o
f
w
a
p
o
n
u
r
n
s
e
n
p
o
n
R
e
t
u
r
n
p
o
n
e
s
e
n
s
o
p
o
n
e
t
e
m
p
p
o
n
l
e
d
b
u
r
p
o
n
r
e
r
r
o
r
9
9
9
,
5
T
e
m
p
9
9
9
,
5
h
T
e
m
p
9
9
9
,
5
t
e
r
9
9
9
,
5
s
o
r
e
r
r
9
9
9
,
5
V
a
l
v
e
9
9
9
,
5
r
e
r
r
o
r
9
9
9
,
5
t
o
o
h
i
g
9
9
9
,
5
n
e
r
s
t
a
9
9
9
,
5
h
r
s
h
r
s
h
r
s
h
r
s
o
r
h
r
s
h
r
s
h
r
s
h
h
r
s
r
t
h
r
s
76
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