75
EN
Cod. 3542B230 - Rev. 00 - 02/2022
OMNIA S HYBRID H 3.2
Error code
Unit
in error
Malfunction or protection
Cause of fault and corrective action
Ec
IU
System accumulation lower temperature probe
fault (Tbt2)
1.Check the probe resistance.
2.The probe connector is disconnected. Reconnect it.
3.The probe connector is wet. Remove the water and dry the connector. Apply waterproof adhesive
tape.
4.Faulty probe; replace it.
Ed
IU
Plate exchanger input water temperature probe
fault (Tw_in)
1.Check the probe resistance.
2.The probe connector is disconnected. Reconnect it.
3.The probe connector is wet. Remove the water and dry the connector. Apply waterproof adhesive
tape.
4.Faulty probe; replace it.
EE
IU
EEprom fault on hydronic board
The hydronic control board is faulty; replace it
F1
EU
DC current too low
-
H0
UI / UE
Communication error between indoor and out-
door unit
1.The cables between the hydronic board of the indoor unit and outdoor unit are not connected.
Reconnect them.
2. If there is a strong magnetic field or high power interference, like lifts, large power supply transform-
ers, etc., add a barrier to protect the unit or move the unit elsewhere.
H1
EU
Communications error between board A of the
inverter module and board B of the main control
board of the outdoor unit
1. Check that the boards are powered. Check that the PCB indicator light on the inverter module is on
or off. If the light is off, reconnect the power supply cable.
2. If the indicator light is off, check the cable connection between the inverter module board and the
main control board; if the cable is loose or broken, reconnect the cable or replace it with a new one.
3. Replace both the boards in turn to see if one of the 2 is faulty.
H2
IU
Refrigerant liquid temperature probe fault (T2) 1.Check the probe resistance.
2.The probe connector is disconnected. Reconnect it.
3.The probe connector is wet. Remove the water and dry the connector. Apply waterproof adhesive
tape.
4.Faulty probe; replace it.
H3
IU
Refrigerant gas temperature probe fault (T2B) 1.Check the probe resistance.
2.The probe connector is disconnected. Reconnect it.
3.The probe connector is wet. Remove the water and dry the connector. Apply waterproof adhesive
tape.
4.Faulty probe; replace it.
H4
EU
Three times P6 fan protection
refer to P6
H5
IU
Temperature probe fault. Room (Ta)
1.Check the probe resistance.
2.The probe connector is disconnected. Reconnect it.
3.The probe connector is wet. Remove the water and dry the connector. Apply waterproof adhesive
tape.
4.Faulty probe; replace it.
H6
EU
Fan protection
1. Strong wind against the expulsion flow of the fan can cause the fan to rotate in the reverse direc-
tion. Change the position of the unit or create a shelter to avoid this phenomenon.
2. Fan motor broken, replace it with a new motor
H7
EU
Voltage protection outside limits
1. Check if the power supply voltage.falls within the permitted range.
2. Switch off and on again multiple times in rapid succession. Leave the unit switched off for more
than 3 minutes, then switch it on again.
3. Faulty hydronic board. Replace it with a new one.
H8
EU
Pressure sensor fault
1. The pressure sensor connection is loose; reconnect it.
2. Pressure sensor fault. Replace it with a new one.
H9
IU
Water outlet temperature probe fault for zone
2 (Tw2)
1.Check the probe resistance.
2.The probe connector is disconnected. Reconnect it.
3.The probe connector is wet. Remove the water and dry the connector. Apply waterproof adhesive
tape.
4.Faulty probe; replace it.
HA
IU
Plate heat exchanger water outlet temperature
probe fault (Tw_out)
1.Check the probe resistance.
2.The probe connector is disconnected. Reconnect it.
3.The probe connector is wet. Remove the water and dry the connector. Apply waterproof adhesive
tape.
4.Faulty probe; replace it.
Hb
IU
Appears after 3 interventions of the “PP” error
with Tw_out <7°C
Refer to “PP” error.