Rectify interference
6 720 643 196 (2010/02)
7
2.3.3 Tripped high pressure switch
Description: Too high pressure in the cooling circuit. Automatic resetting of the pressostat, which must be
acknowledged in the display.
Check Action
1. B Manually operate G2
Does G2 start?
yes: Does the error message recur? Æ 7
no: Æ 2
2. B Measure the connection on terminal
blocks for G2 (Do1 - N)
Is there 230V?
yes: B Replace G2.
Does the error message recur? Æ 3
no: B Check connection/glass fuse, or if necessary
replace I/O circuit board.
Does the error message recur? Æ 3
3. Does G2 increase in speed when relay
HR1 is affected?
B Apply 230V to A1.
yes: Æ 4
no: B Replace relay.
Does the error message recur? Æ 4
4. B Go to alarm history.
What did the heat pump do on that occa-
sion, was the three-way valve connected?
yes: Æ 7
no: Æ 5
5. B Check the dirt filter on the hot side.
Is there dirt in it?
yes: B Clean the filter.
no: Does the error message recur? Æ 6
6. B Check the flow in the heating circuit.
Is it sufficient with the thermostats
open?
yes: Æ 12
no: B Open the thermostat valves.
Does the error message recur? Æ 12
7. Air in the hot water heater. B Vent the heater.
Does the error message recur? Æ 8
8. B Check the hot water setting.
Stop temperature in comfort mode =
63 °C Stop temperature in economy
mode = 57 °C
Does the error message recur?
yes: B Reset the hot water settings to the default values.
Æ 9
no: At a high incoming heat transfer fluid (collector) tem-
perature the hot water temperature must be reduced
slightly.
Does the error message recur? Æ 9
Tab. 3
6 720 643 196-02.1I
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