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7
Inspection and maintenance operations
Tab.90
Check
Tightness test
Electrical connections
Screws and nuts
Insulation
Filters of indoor unit(s)
Outdoor unit heat exchanger
Casing indoor and outdoor unit(s)
Casing of the outdoor unit
Condensate pan
Fan
Vegetation
Leaves and snow
8
Troubleshooting
8.1
Error codes
Tab.91
Error code
Description
E1
Fault with the room temperature sensor
E2
Fault with the refrigerant temperature sensor on the outdoor unit
E3
Fault with the refrigerant temperature sensor on the indoor unit
E4
Fault with the fan motor on the indoor unit (PG motor)
E5 (5E)
Communication error between the outdoor unit and the indoor unit
7797831 - v04 - 07122022
1. Refit all the panels, fascias and covers on the indoor and outdoor
units.
2. Switch on the indoor unit.
3. Activate the cooling mode on controller.
4. After 3 minutes, check if air is coming out of the indoor units.
5. Check that there is no abnormal noise coming from the indoor unit
and outdoor unit.
6. Press the other buttons on the controller and check wether the
complete unit is working properly.
7. Activate the heating mode and check if warm air flows out of the
indoor unit and that there is no abnormal noise coming from the units.
Important
Inspection and maintenance operations must be carried out at
least once a year, by a qualified professional.
Check the operation of the installation:
Air conditioner in cooling mode
Air conditioner in heating mode
User interface (remote controller or wall controller)
Operations to be carried out
Leak-tightness of the refrigerant circuit (use a sniffer leak detector).
Replace any faulty parts and cables.
Check all screws and nuts (cover, support, etc.).
Replace any damaged sections of insulation.
Clean the filters regularly.
Clean the outdoor unit heat exchanger gently with a soft brush or with a soft jet of
water (no high pressure sprayer or pressures this can damage the heat exchanger).
Clean the outside of the appliance using a damp cloth and a mild detergent.
Check periodically signs of rust or scratches. Repair the defective position or apply
the rust resisting paint if necessary.
Check the water level in the box. In case of stagnation, clear the siphon or check
the lift pump is operational.
Visual check for swing and balance. Check adhesion of dust and external appear
ance.
Remove excessive vegetation around the outdoor unit.
Remove leaves and snow in the neighbourhood of the outdoor unit.
In case of appliance failure, the indoor unit and wired controller will display
an error code.
7 Inspection and maintenance operations
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