T
T
a
a
b
b
l
l
e
e
1
1
8
8
F
F
a
a
u
u
l
l
t
t
D
D
i
i
s
s
p
p
l
l
a
a
y
y
F
F
L
L
A
A
S
S
H
H
I
I
N
N
G
G
Display message
FLASHING
Type of fault
Check table
row number
STB- supply
Maximum flow temperature has been reached 2,4,5,21,23,24,29,30
STB- fluegas
Maximum flue gas temperature has been
reached
4,5,23,24,29,33
Fanspd high
Fan speed is too high
7,8,9,39,40
Fanspd low
Fan speed is too low
7,8,9,39,40
Ignit fault
No flame after 4 attempts
10,11,16,18,22,25
No flame
Flame failed during operation
11,12,16,22,25,2632,
44
False flame
False flame detection
18,35
S1 disconnect
Sensor or cable interrupted
3,41,42,43
S3 disconnect
Sensor or cable interrupted
3,41,42,43
S4 disconnect
Sensor or cable interrupted
3,41,42,43
S7 disconnect
Sensor or cable interrupted
3,41,42,43
Program end
Sensor or cable interrupted
3,41,42,43
Gasvalve
No phase connection for gas valve
34,20
Softw Fault
A software error has occurred
34
Reset-Key
Reset button is stuck
34
Eeprom
EEPROM test failed
34
Intern fault
Test fault
In addition, there is a number of faults that cannot be reported by means of a textual display:
T
T
a
a
b
b
l
l
e
e
1
1
9
9
N
N
o
o
n
n
D
D
i
i
s
s
p
p
l
l
a
a
y
y
F
F
a
a
u
u
l
l
t
t
s
s
a
a
n
n
d
d
E
E
r
r
r
r
o
o
r
r
s
s
water inside casing
leak
load is too low discharge resistance
Fan speed
CO-content is too high
bad combustion
CO2 % is too low
too little gas or too much air
CO2 % is too high
too much gas
tap water temperature too low
leaking three-way valve
to little tap water
blockage, lime scale deposit
no CH operation
leaking hot water pipe or dripping tap
Display has illegible text
moisture problems in unit controller, or an incorrect
ignition plug used on the electrode
Water pressure constantly low
leak in system, or internal leak in expansion vessel
EC 16~38 Installation Manual page
51
