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ALARM FUNCTIONS AND DISPLAYS
PROBABLE CAUSE 1; TEMPORARY FAULT:
B Wait and see.
PROBABLE CAUSE 2; DEFECTIVE SENSOR OR
INCORRECT CONNECTION:
B Check the temperature sensor connection.
B Check the temperature sensor resistance (
chapter 15.4).
14.9.4 FAULTY FUNCTION IN 4-WAY VALVE
Fig. 55
POSSIBLE CAUSE 1: 4-WAY VALVE FAULTY.
B Select Acknowledge.
B Check the function of the 4-way valve. Manually
switch the 4-way valve in the corresponding menu
point at the control panel on and off.
14.9.5 T6 HIGH HOT GAS TEMPERATURE
Fig. 56
POSSIBLE CAUSE 1: OCCASIONALLY EXCESSIVE
TEMPERATURE CAUSED BY UNUSUAL OPERATING
CONDITION.
B Select Acknowledge.
B Check the temperature differential between
temperature sensors T8 and T9 in the heat pump (
chapter 12.4).
POSSIBLE CAUSE 2: EXCESSIVE COMPRESSOR
OPERATING TEMPERATURE.
B Select Acknowledge.
B Check for overheating.
14.9.6 FAULT ON ELECTRIC ADDITIONAL HEAT
Fig. 57
42
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Possible cause 1: Overheat protection of the additional
heater has tripped.
B Select Acknowledge.
B Reset the overheat protection on the additional
14.9.7 T8 HIGH FLOW TEMPERATURE
Fig. 58
6 720 641 467-21.1I
Temperature sensor T8 is fitted inside the heat pump.
This stops the compressor for safety reasons as soon as
the flow temperature exceeds the selected value.
PROBABLE CAUSE 1; INSUFFICIENT FLOW OVER THE
HEAT PUMP:
B Select Acknowledge.
B Check whether the primary heating circuit pump has
B Check that all the valves are open. The thermostat
B Select a higher speed for the heat transfer medium
6 720 641 467-22.1I
POSSIBLE CAUSE 2; BLOCKED PARTICLE FILTER:
B Select Acknowledge.
B Check filter.
B Clean filter if required ( chapter 14.7).
14.9.8 LOW TEMPERATURE IN CONDENSER
Fig. 59
The alarm is triggered because the temperature inside
the heat pump is too low. Initially, a warning is issued.
Following four warnings within two hours, an alarm is
triggered.
POSSIBLE CAUSE 1: AIR IN THE HEATING SYSTEM.
6 720 641 467-23.1I
B Select Acknowledge.
B Check whether air is in the heating system.
heater ( Chapter 14.6).
stopped (
Fig. 53, [1], page 41)..
valves in heating systems should be fully open and in
floor heating systems at least half of the coils should
be fully open.
pump (G2). Also set a higher speed for the heating
circuit pump (G1), as it needs to run with a higher
speed than the heat transfer medium pump.
6 720 641 467 (2010/01)
6 720 641 467-24.1I
6 720 641 467-25.1I
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