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41Instructions for the Installer
A8
Malfunction
Frost protection element gets too hot
Remove the filter,
the plastic front cover and
the metal cover
Does the frost protection
element flap work properly?
(Check with P76)
Yes
Check the following factors:
- Fan settings (too low?)
- Supply air valves (opened too wide?)
- The entire duct system (blockage?)
No
See A5 / A6 Malfunction
section “Initiate self-test”
A7
Malfunction
Frost protection element does
not warm up (sufficiently)
Remove the plug
from the socket
Remove the filter,
the plastic front cover and
the metal cover
Remove the plug of frost
protection element from the PCB
Is the resistance
of the plug of the frost
protection element
> 300 ohm?
Yes
Remove the heat exchanger and
the frost protection element
(and also the foam part in case
of right-hand version)
Is the resistance of
the cable of the frost
protection element
infinite?
Yes
If fuse is blown,
replace cable
No
Is resistance
of T1 OK?
No
Yes
Replace T1
temperature sensor
Replace the PCB
No
Check resistance of the cable
and check connections with the
frost protection element
CAUTION!
Avoid contact with the
PCB and frost protection
element due to risk of
electrocution
CAUTION!
Avoid contact with the
PCB and frost protection
element due to risk of
electrocution