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Troubleshooting
13.2 Error codes
When a safety device is activated, an error code is displayed on the user interface.
The following table contains a list of possible errors and their corrective actions.
Reset the safety device by switching the unit o and on again.
If the reset procedure fails, contact your local dealer.
Error
code
Malfunctioning
or protection
Cause of the problem and corrective action
CO
multiple units configured as
master in the master - slave
network
• configure only one unit as master
E0
Flow switch error (E8
displayed 3 times; to be
seen together with E8).
• The electric circuit has short-circuited or is open. Reconnect the
wires correctly.
• The water flow-rate is insucient.
• The flow switch is faulty. The switch opens or closes continuously.
Replace the flow switch.
• The system pressure losses are too high for the head of the
unit's circulator. Overhaul the system.
E1
Phase sequence error (only
for three-phase units).
• Check that the power cables are firmly connected to avoid
phase losses.
• Check the sequence of the power cables, change the sequence
of any pair of the three power cables.
E2
Communication error
between the user interface
and the main hydraulic
module control board.
• There is no connection between the wired control and the unit.
Connect the wires.
• The sequence of the communication wires is not correct.
Reconnect the wires in the correct sequence.
• There may be a strong magnetic field or electrical interference,
e.g. from lifts, large transformers, etc. Add a barrier to protect the
unit or move it to another location.
• Check for possible interference from power cables along the
path of the control cable.
E3
Error of the backup heater’s
heat exchanger outlet T1
temperature sensor.
• The T1 sensor connector is loose. Reconnect it.
• The T1 sensor connector is wet or contains water. Expel the
water and dry the connector. Apply a waterproof adhesive.
• T1 sensor error, replace with a new sensor.
E4
T5 DHW temperature
sensor error
• The T5 sensor connector is loose. Reconnect it.
• The T5 sensor connector is wet or contains water. Expel the
water and dry the connector. Apply a waterproof adhesive.
• T5 sensor error, replace with a new sensor.
E5
Error of the finned coil outlet
T3 refrigerant temperature
sensor in cooling mode.
• The T3 sensor connector is loose. Reconnect it.
• The T3 sensor connector is wet or contains water. Expel the
water and dry the connector. Apply a waterproof adhesive.
• T3 sensor error, replace with a new sensor.
E6
T4 room temperature sensor
error.
• The T4 sensor connector is loose. Reconnect it.
• The T4 sensor connector is wet or contains water. Expel the
water and dry the connector. Apply a waterproof adhesive.
• T4 sensor error, replace with a new sensor.
E7 Tbt1 sensor error.
• The Tbt1 sensor connector is loose. Reconnect it.
• The Tbt1 sensor connector is wet or contains water. Expel the
water and dry the connector. Apply a waterproof adhesive.
• Tbt1 sensor error, replace it.
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