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Unit
Malfunction or protection
Error code
in error
boards (for cascaded applications)
Hd
IU
Communications error between the main board
HE
IU
and the thermostat expansion board
Eprom EE error on the inverter module board 1. EEprom error; rewrite the data on the EEprom.
HF
EU
HH
EU
Low pressure protection in cooling Pe<0.6 oc-
HP
EU
curred 3 times in one hour
L0
Inverter module protection
EU
L1
Protection for low voltage on DC bus
EU
L2
Protection for high voltage on DC bus
EU
MCE error
L4
EU
L5
Zero speed protection
EU
L7
Phase sequence error
EU
L8
EU
than 15Hz per second
L9
EU
Low pressure switch protection
P0
EU
P1
High pressure switch intervention
EU
Compressor electrical current absorption great-
P3
EU
er than maximum limit allowed
Compressor drain temperature (Tp) greater
P4
EU
than the maximum limit allowed
Temperature difference between Tw_out and
Tw_in too high
P5
IU
P6
Inverter module protection
EU
Antifreeze protection
Pb
IU
Coil probe temperature (T3) greater than maxi-
Pd
EU
mum limit allowed in cool mode
Error due to difference in temperature between
Twout and Twin not in line with the operating
mode. The error appears in heat mode if Twout
PP
IU
is less than Twin for more than 15 minutes
UI: Indoor unit
UE: Outdoor unit
COMMISSIONING
EN
126
Cause of fault and corrective action
ences, switch on again;
face connected to the master unit and then, switch on again;
the interval between the start-up of the master unit and slave unit is less than 2 minutes, switch on
again;
4. Conflict between the master and slave unit addresses:
3. The inverter module board is broken; replace it with a new one.
refer to H6
Refer to P0
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2. The water flow is too low in cooling mode. Increase the water flow.
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2. Check if the water filter need cleaning.
4. Check the water pressure. The water pressure must be > 1 bar
5. Check that the pump speed setting is on the maximum speed.
6.Make sure that the expansion vessel is not broken.
7. Check that the resistance in the water circuit is not too high for the pump.
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1.Check the resistance of the 2 temperature probes.
2.Check the position of the 2 probes.
3.The probe connector is disconnected. Reconnect it.
Cod. 354M000010 - Rev. 03 - 06/2023
OMNIA SW-T 3.2
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