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Code/meaning
F.1100
Safety cut-out for electric back-
up heater triggered
F.1117
Frequency inverter phase failure
F.1120
Electric back-up heater phase
failure
F.9997
Communication between the
indoor unit and outdoor unit is
not possible due to the different
versions of the bus protocol.
F.9998
No communication is possible
between the indoor unit and the
outdoor unit.
L
5.4 kW electric back-up heater
Display set value
External back-up heater
0.5 kW
1.0 kW
1.5 kW
2.0 kW
2.5 kW
3 kW
3.5 kW
4.0 kW
4.5 kW
5.0 kW
5.5 kW
8000017440_FT Installation and maintenance instructions
Possible cause
The safety cut-out for the elec-
tric back-up heater is open due
to: – Insufficient volume flow or
air in the building circuit, – Im-
mersion heater operation for un-
filled building circuit, – Immer-
sion heater operation for flow
temperatures above 95 °C trips
the safety fuse of the safety cut-
out and requires that a fuse be
replaced, – Feed-in of external
heat in the building circuit.
Defective fuse. Incorrect
electrical connections. Mains
voltage too low. Com-
pressor/low-tariff power supply
not connected. Energy supply
company lockout longer than
three hours.
Electric back-up heater defect-
ive. Poorly tightened electrical
connections. Mains voltage too
low.
Replacement/spare part case
for the control PCB or outdoor
unit
Modbus cable not connected or
connected incorrectly. Outdoor
unit without supply voltage.
Power consumption
0.0 kW
1.35 kW
2.0 kW
3.35 kW
4.0 kW
5.35 kW
Measure
1.
Check for circulation in the building circuit pump.
2.
If required, open the stopcocks.
3.
Replace the safety cut-out.
4.
Reduce or stop the transfer of heat from outside.
5.
Check that the dirt filter that is in place is permeable.
1.
Check the fuse.
2.
Check the electrical connections.
3.
Check the voltage at the heat pump electrical connection.
4.
Reduce energy supply company anti-cycling time to under
three hours.
1.
Check the electric back-up heater and its power supply.
2.
Check the electrical connections.
3.
Measure the voltage at the electrical connection for the elec-
tric back-up heater.
▶
Ensure that the unit pairing is correct.
▶
Check the connection pipes between the power supply PCB
and control PCB on the indoor and outdoor unit.
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