
29
System Functions
EN
A8
Malfunction
Frost protection device too hot
Bypass damper
functioning correctly in relation
to frost protection device?
(check with P76 to 1)
Yes
Check following sources of malfunctions:
(volume flow rate to low)
- Fans setting too low
- Supply air valves closed to tight
- Supply air duct blocked /
outdoor air intake closed
No
See malfunction code A5/A6
At block "Active self-test"
A7
Malfunction
Frost protection element does
not warm up (sufficiently)
Isolate from mains supply!
Remove filters,
plastic front
and sealing plate
Remove the connector of
frost protection device from the PCB
Yes
Remove heat exchanger
and frost protection device
Cable resistance
of frost protection device
infinite?
Yes
Check PCB fuse;
replace cable
No
Resistance
of T1 OK?
Replace temperature
sensor T1
Caution:
Reset unit
Check frost protection device
in conjunction with cable
Remove filters,
plastic front
and seal
WARNING!
Danger of death from
live components –
do not touch the PCB!
WARNING!
Danger of death from
live components –
do not touch the PCB!
Resistance measured
at connector
of frost protection device
> 300 Ohm?
Yes
No
No
Malfunction
Set P53 to 0
Set unit
(P74 auf 1)
A10
Malfunction
Set P55 to 0
Set unit
(P74 auf 1)
A11
Содержание santos 570 DC
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