ALARM FUNCTIONS AND DISPLAYS
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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 (
Æ
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 (
Æ
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
Possible cause 1: Overheat protection of the additional
heater has tripped.
B
Select
Acknowledge
.
B
Reset the overheat protection on the additional
heater (
Æ
Chapter 14.6).
14.9.7 T8 HIGH FLOW TEMPERATURE
Fig. 58
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
stopped (
Æ
Fig. 53, [1], page 41)..
B
Check that all the valves are open. The thermostat
valves in heating systems should be fully open and in
floor heating systems at least half of the coils should
be fully open.
B
Select a higher speed for the heat transfer medium
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.
POSSIBLE CAUSE 2; BLOCKED PARTICLE FILTER:
B
Select
Acknowledge
.
B
Check filter.
B
Clean filter if required (
Æ
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.
B
Select
Acknowledge
.
B
Check whether air is in the heating system.
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