Troubleshooting; General Guidelines; General Symptoms - Ferroli OMNIA S 3.2 Manuel D'installation, D'utilisation Et D'entretien

10. TROUBLESHOOTING

This section provides useful information for diagnosing and correcting certain troubles which may occur in the unit.

10.1 General guidelines

Before starting the troubleshooting procedure, carry out a thorough visual inspection of the unit and look for obvious defects such as loose connections or defective
wiring.
WARNING
When carrying out an inspection on the switch box of the unit, always make sure that the main switch of the unit is
switched off.
When a safety device was activated, stop the unit and find out why the safety device was activated before resetting
it. Under no circumstances can safety devices be bridged or changed to a value other than the factory setting. If the
cause of the problem cannot be found, call your local dealer.
If the pressure relief valve is not working correctly and is to be replaced, always reconnect the flexible hose attached
to the pressure relief valve to avoid water dripping out of the unit!

10.2 General symptoms

Symptom 1: The unit is turned on but is not heating or cooling as expected
Possible causes
The setting of some parameters is not correct .
The water flow is too low.
The volume of water in the installation is too low.
Symptom 2: The unit is turned on but the compressor is not starting (space heating or domestic water heating)
Possible causes
The unit may operate outside its operating range
(the water temperature is too low ).
Symptom 3: Pump is making noise (cavitation)
Possible causes
There is air in the system.
The water pressure at the pump inlet is too low.
Symptom 4: The water pressure relief valve opens
Possible causes
The expansion tank is broken or drained
The pressure of the filling water in the system is higher than
3 bar.
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Corrective action
Check the parameters
T4HMAX, T4HMIN in heating mode.
T4CMAX, T4CMIN in cooling mode
T4DHWMAX, T4DHWMIN in DHW mode.
Check that all the hydraulic circuit shut-off valves are open .
Check if the water filter is clogged.
Check that there is no air in the hydraulic circuit .
Check the water pressure. The water pressure must be> 1 bar (measured with cold water).
Check that the expansion tank is not broken.
Check that the pressure drop in the hydraulic circuit is not too high for the pump.
Make sure that the volume of water in the installation is above the minimum required value
Corrective action
In case of low water temperature, the system uses the backup system electric heater to first reach the minimum water
temperature (12 ° C).
Check that the power supply of the backup system electric heater is correct.
Check that the electrical protection of the backup system electric heater is closed.
Check that the safety thermal switch of the backup system electric heater is not activated.
Check that the backup system electric heater contactors are not faulty.
Corrective action
Purge the air.
Check the water pressure.
The water pressure must be > 1 bar (measured with cold water).
Check that the expansion tank is not broken or discharged.
Check that the pre-charge of the expansion vessel is correct
Corrective action
Replace the expansion tank. Recharge the expansion tank.
Make sure that the filling water pressure in the system is approximately 1 and 2 bar.
Cod. 3541V941 - Rev. 00 - 09/2021
OMNIA S 3.2