Ariston No Power / Dead Furnace

Furnace will not start at all; no lights on display, no fan, completely dead.

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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

Tripped breaker, Blown internal fuse, Faulty main switch, Failed control board

How to Fix / Troubleshooting

Safety: Before working on electrical components, switch off power at the main breaker.

  • Check household breaker: Locate the circuit breaker feeding the furnace and reset if tripped. If it trips again immediately, do not force it; call an electrician or technician.
  • Verify main switch: Ensure the furnace's own power switch (if fitted) is in the ON position.
  • Inspect power cord and plug (if applicable): Look for damage or loose connections.
  • Internal fuse: Some Ariston boards have a replaceable fuse. With power OFF, inspect and replace only with the same type and rating if blown. If it blows again, a deeper fault exists.
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Repair Difficulty

Medium 3/5

Required Part

Control Board (PCB)
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