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The following graphs describe the blocking codes of the water heater. A blocking code is only a temporary blocking of the water heater, because
of an extraordinary situation. The water heater will continue to operate after stabilisation of this situation.
16.18.2 BLOCKING CODES
The display is not blinking, but is lightened up during the blocking period.
The water heater is blocking an action because of an extraordinary situation. This action will be continued after stabilisation of this situation.
Display message
Reason
Display message
Reason
Display message
Reason
Display message
Reason
Display message
Reason
Display message
Reason
Display message
Reason
Display message
Reason
Display message
Reason
A
n
t
The controller received a new heat demand too quick after the last ended demand.
F
l
u
Flue gas temperature has exceeded the limit, as set in the parameters.
F
l
o
Flow temperature has exceeded the blocking temperature, as set in the parameters, but it has not
exceeded the lock-out value.
R
e
t
Return temperature has exceeded the blocking temperature, as set in the parameters, but it has not
exceeded the lock-out value.
T
2
-
Temperature difference T2-T1 has exceeded the blocking value which has been set in the parameters.
D
e
a
The water heater starts its deairation function and after will return to normal operation. This function can
be activated by parameter P4AJ.
D
e
l
Temperature difference T2-T1 has exceeded the blocking value, as set in the parameters P2CQ-P2CV.
H
e
a
Temperature difference T2-T1 has exceeded the blocking value, as set in the parameters P2CQ-P2CV, more
than three times,.
G
a
s
Gas supply pressure is (too) low.
i
c
y
c
l
e
e
t
e
m
p
w
t
e
m
p
u
r
n
t
e
T
1
h
i
g
i
r
a
t
i
o
t
a
D
i
r
t
e
x
c
h
a
p
r
e
s
s
t
i
m
e
9
9
9
,
h
i
g
h
9
9
9
,
h
i
g
h
9
9
9
,
m
p
h
i
g
9
9
9
,
h
9
9
9
,
n
9
9
9
,
e
c
t
b
l
9
9
9
,
n
g
a
t
9
9
9
,
u
r
e
l
o
9
9
9
,
5
h
r
s
5
h
r
s
5
h
r
s
h
5
h
r
s
5
h
r
s
5
h
r
s
o
c
k
5
h
r
s
r
i
s
k
5
h
r
s
w
5
h
r
s
78
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