Troubleshooting
81
Diagnosis
(continued)
Faults with fault display on the programming unit
(continued)
Fault code
in display
Behaviour of system
Cause of fault
Action
0f
Controlled operation
Service required
”0F” is only displayed
in the fault history
Carry out maintenance
Please note:
After carrying out main-
tenance, set coding ”24: 0”.
10
Operates on basis of 0°C outdoor
temperature
Short circuit
Outdoor temperature sensor
Check outdoor temperature
sensor (see page 99)
18
Operates on basis of 0°C outdoor
temperature
Open circuit
Outdoor temperature sensor
Check outdoor temperature
sensor (see page 99)
30
Burner is switched on and off by the
adjustable high limit
Short circuit
Boiler temperature sensor
Check boiler temperature
sensor (see page 101)
38
Burner is switched on and off by the
adjustable high limit
Open circuit
Boiler temperature sensor
Check boiler temperature
sensor (see page 101)
40
Mixing valve is closed
Short circuit
Supply temperature sensor of
mixing valve circuit M2
Check supply temperature
sensor (see page 28)
44
Mixing valve is closed
Short circuit
Supply temperature sensor of
mixing valve circuit M3
Check supply temperature
sensor (see page 86)
48
Mixing valve is closed
Open circuit
Supply temperature sensor of
mixing valve circuit M2
Check supply temperature
sensor (see page 86)
4c
Mixing valve is closed
Open circuit
Supply temperature sensor of
mixing valve circuit M3
Check supply temperature
sensor (see page 86)
50
DHW tank heating pump ON:
Desired boiler temperature = desired
DHW tank temperature, priority controls
are cancelled.
In conjunction with DHW tank heating
system:
DHW tank heating is switched on and off
by DHW tank temperature sensor 2.
Short circuit
DHW tank temperature
sensor 1
Check DHW tank
temperature sensor
(see page 101)
51
In conjunction with DHW tank loading
system:
DHW tank heating is switched on and off
by DHW tank temperature sensor 1.
Short circuit
DHW tank temperature sensor
2
Check DHW tank
temperature sensor
(see page 101)
58
DHW tank loading pump ON:
Desired boiler temperature = desired
DHW tank temperature, priority controls
are cancelled.
In conjunction with DHW tank loading
system:
DHW tank heating is switched on and off
by DHW tank temperature sensor 2.
Open circuit
DHW tank temperature sensor
1
Check DHW tank
temperature sensor (see
page 101)
59
In conjunction with DHW tank loading
system:
DHW tank heating is switched on and off
by DHW tank temperature sensor 1.
Open circuit
DHW tank temperature sensor
2
Check DHW tank
temperature sensor (see
page 101)
5285
941
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0
1
