169
Troubleshooting
Error
code
Malfunctioning
or protection
Cause of the problem and corrective action
H2
Error of the plate heat
exchanger inlet temperature
sensor (T2) on the
refrigerant side in cooling
mode.
• The T2 sensor connector is loose. Reconnect it.
• The T2 sensor connector is wet or contains water. Expel the
water and dry the connector. Apply a waterproof adhesive.
• T2 sensor error, replace with a new sensor.
H3
Error of the heat exchanger
outlet temperature sensor
(T2B) on the refrigerant side
in cooling mode.
• The T2B sensor connector is loose. Reconnect it.
• The T2B sensor connector is wet or contains water. Expel the
water and dry the connector. Apply a waterproof adhesive.
• T2B sensor error, replace with a new sensor.
H4
Three P6 protection
activations.
See P6.
H5
Ta internal temperature
sensor error.
• Set the Ta sensor on the interface.
• If the Ta sensor is faulty, replace the sensor or interface.
H6 DC fan error.
• The fan is exposed to a strong wind that causes it to operate in
the opposite direction. Change the direction of operation of the
unit or provide a guard to protect it from strong air currents.
• The fan motor is faulty, replace it.
H7 Main circuit voltage fault.
• Check that the power supply values are within the available
range.
• The unit has been switched on and o several times at close
intervals. Keep the unit switched o for at least 3 minutes before
switching it on again.
• Faulty circuit in the main control board. Replace the main PCB.
H8 Pressure sensor error.
• The pressure sensor connector is loose. Reconnect it.
• The pressure sensor is faulty. Replace it.
H9 Tw2 sensor error.
• The sensor connector is loose. Reconnect it.
• The sensor connector is wet or contains water. Expel the water
and dry the connector. Apply a waterproof adhesive.
• Sensor error, replace it with a new sensor.
HA
Error of the TW_out leaving
water temperature sensor of
the plate heat exchanger.
• The TW_out sensor connector is loose. Reconnect it.
• The TW_out sensor connector is wet or contains water. Expel
the water and dry the connector. Apply a waterproof adhesive.
• The TW_out sensor is faulty. Replace it.
Hb
PP protection trips 3 times
and Tw_out <7°C.
see PP.
Hd
Communication error
between master and slave
units.
• wrong address.
• incorrect wiring.
• check board fuse.
• H1-H2 wiring.
HE
Communication error
between main board and
thermostat.
The outdoor temperature is very high (above 30°C) but the unit is
still operating in Heating mode.
Disable the Heating mode when the room temperature exceeds
30°C.
HF
Inverter module EEprom
error.
• The EEprom parameter is set incorrectly, rewrite the EEprom
data.
• The EEprom chip is faulty, replace it.
• The main module is faulty, replace it.
HH
H6 displayed 10 times in 2
hours.
See H6.
HL PFC module fault. Contact distributor.
HP
Low pressure protection (Pe
< 0.6) tripped 3 times in one
hour.
See P0.
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