5. Undo screws D and pull out plate-
type heat exchanger C to the
front.
6. Check the DHW connections for
scaling and, if required, replace the
plate-type heat exchanger.
7. Check the heating water connec-
tions for contamination and, if
required, flush via central heating
return G (flushing system for
plate-type heat exchanger, see pri-
celist).
8. Lubricate the new gaskets/seals.
Install in reverse order with new
gaskets.
Checking the outside temperature sensor (weather-compen-
sated control unit)
1. Pull plug "X3" from the control unit.
2. Test the resistance of the outside
temperature sensor across term-
inals "X3.1" and "X3.2" on the dis-
connected plug and compare it with
the curve.
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