Troubleshooting; General Guidelines; General Symptoms - Ferroli OMNIA S 3.2 Installations- Und Bedienungsanleitung

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 incorrect.
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 could be operating 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 pump input water pressure is too low.
Symptom 4: The water pressure relief valve opens
Possible causes
The expansion vessel is broken or empty
The filling water temperature in the system is
greater 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.
Make sure that all the shut-off valves in the hydraulic circuit 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 (with cold system water).
Make sure that the expansion vessel 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 higher than the minimum value requested
Corrective action
If the water temperature is low, the system uses the back-up system electric heater to reach the first minimum water
temperature (12°C).
Check that the back-up system electric heater power supply is correct.
Check that the electric protection of the back-up system electric heater is correct.
Check that the thermal cut-off switch of the back-up system electric heater is not activated.
Check that the back-up system electric heater meters are not faulty.
Corrective action
Bleed the air.
Check the water pressure.
The water pressure must be > 1 bar (measured with cold water).
Make sure that the expansion vessel is not broken or empty.
Check that the preload of the expansion vessel is correct
Corrective action
Replace the expansion vessel. Refill the expansion vessel.
Make sure that the filling water temperature in the system is about 1 or 2 bar.
Cod. 3541V941 - Rev. 04 - 05/2022
OMNIA S 3.2