Fault finding and diagnostics
6 720 808 928 (2017/06)64
9.6.4 Heat Interface Unit function test menu
▶ Enter the Service menu and navigate through the menus and select
the Diagnosis menu.
▶ Navigate through the Diagnosis menu and select the Function test
menu.
▶ Navigate through the Function test menu and select the Heat
Interface Unit menu.
▶ Select the parameter and adjust to test the valve.
9.7 Central heating pump test
To check the pump operation of the central heating pump
▶ Set the central heating rotary switch to the pump ( ) position.
– Ensure the central heating rotary switch is returned to its original
position for normal central heating operation.
9.8 Heat meter (if fitted)
The integrator display an error message with the 3 letters “Err” and a
code. If several errors occur at the same time, the different codes are
shown sequentially.
The error is displayed in the first position of the display menu. It will still
be possible to select all the other display menus by pressing the
navigation button, refer to section 6.8.
If the navigation button is no longer pressed for a period of 3 minutes,
the error code automatically appear again in the first position of a display
menu. Display of an error automatically disappears when the error is no
longer present.
•Err. 1
– Flow higher that 1.2 x qs or defective hydraulic sensor.
•Err. 2
– Measured temperature outside the homologated range or
temperature sensor is defective.
Fig. 80 Error display
9.9 Component resistance characteristics
9.9.1 Flow/return temperature NTC sensors
9.9.2 DHW NTC wet sensor
9.9.3 Outdoor weather compensation sensor
Heat Interface Unit
parameter Description
DHW Set DHW control valve position (%).
• 0%(closed - 100% (fully open)
CH Set CH control valve position (%).
• 0%(closed - 100% (fully open)
Table 41
6720808928-56.1Wo
1
Resistance ( Ω) Temperature ( °C)
29529 0
18787 10
12257 20
8186 30
5586 40
3889 50
Table 42 Central heating/district sensors
Resistance ( Ω) Temperature ( °C)
14772 20
11981 25
9786 30
8047 35
6653 40
5523 45
4608 50
3856 55
3243 60
2744 65
2322 70
1990 75
1704 80
1464 85
1262 90
1093 95
950 100
Table 43 DHW wet sensor
Resistance ( Ω) Temperature ( °C)
2392 -20
2088 -16
1811 -12
1562 -8
1342 -4
1149 0
948 4
842 8
781 10
642 15
528 20
436 25
Table 44 Outdoor weather compensation sensor
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