E16
Ariston Gas Valve / Modulation Fault

Ariston gas water heater shows E16; unit may lock out after several failed ignition attempts.

Advertisements

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.

Advertisements

Possible Causes

Defective gas valve coil, Incorrect gas pressure, Blocked gas filter in valve, Faulty modulation control from PCB

How to Fix / Troubleshooting

Safety first: Turn off gas and power. Only qualified gas technicians should adjust gas components.

  • Visual inspection: Check the gas valve and its connectors for damage or loose plugs.
  • Check gas supply pressure (technician): Using a manometer, verify inlet and outlet pressures meet Ariston specifications.
  • Test valve coil resistance: A technician can measure coil resistance and compare with service data.

In most cases, E16 requires professional diagnosis and replacement of the gas valve or control board. Do not attempt to open or modify the gas valve yourself.

Advertisements

Repair Difficulty

Professional Required 5/5

Required Part

Gas Valve Assembly
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements