E16
Ariston
Phase / Power Supply Protection (for certain models)
Unit shows E16; compressor starts then quickly stops, or does not start at all.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Incorrect supply voltage, Missing phase on three-phase models, Reversed phase sequence, Faulty power supply board
How to Fix / Troubleshooting
Safety first: Only qualified personnel should work on mains wiring. Always isolate power at the main breaker.
- Step 1 – Confirm supply type: Check the Ariston nameplate to verify if the unit is single-phase or three-phase and the required voltage.
- Step 2 – Check breaker and wiring: Ensure the correct breaker size is installed and that all phases are present (for three-phase). Look for tripped breakers or blown fuses.
- Step 3 – Measure voltage: Using a multimeter (qualified person only), verify that voltage at the outdoor unit terminals matches the specification and that all phases are present and balanced.
- Step 4 – Correct wiring: If phases are reversed or missing, correct the wiring at the distribution board.
- Technician tasks: If supply is correct but E16 persists, the power supply or phase detection circuit on the outdoor PCB may be faulty and require replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Outdoor Power Supply / Phase Detection Board
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