Rectify interference
6 720 643 196 (2010/02)
13
2.3.6 High temperature difference heating system
water
Description: The temperature difference between T8 and T9 is greater than X, where X is calculated as a linear
function of the compressor frequency. 20Hz=10K and 90Hz=18K.
Check Action
1. B Clean the dirt filter on the hot side. B Remove the filter basket and clean it.
Does the error message recur? Æ 2
2. B Go to temperatures and check the
value on T8 and T9.
B Use a digital thermometer and meas-
ure at the sensor.
Do the values correspond?
yes: Æ 3
no: B Check the sensors and replace if necessary.
Does the error message recur? Æ 4
3. B Check the flow in the heating system. B Check that the thermostat valves are open.
Does the error message recur? Æ 4
4. The heating system is not sufficiently
large for the relevant heat pump.
B Expand the system volume (volume tank or several
radiators).
Tab. 6
6 720 643 196-05.1I
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