Beretta No Power / Main Supply Failure

Furnace does not start at all, no lights on display, 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

Blown main fuse on Beretta control board, Tripped circuit breaker, Faulty main power switch on furnace, Loose mains wiring terminal block

How to Fix / Troubleshooting

Safety: Before touching any wiring, turn off power at the main breaker and verify with a tester if available.

  • Check household breaker: Confirm the circuit breaker or fuse feeding the furnace is ON and not tripped. Reset if necessary.
  • Inspect furnace switch: Many Beretta furnaces have an external on/off switch. Ensure it is in the ON position.
  • Check mains terminal block: Remove the electrical cover on the furnace and inspect the L/N/PE terminal block. Tighten any loose screws and look for burnt insulation.
  • Inspect internal fuse: Locate the small fuse on the control board. If blown, replace only with the same type and rating. If it blows again immediately, a short circuit exists and a technician must diagnose it.
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Repair Difficulty

Medium 3/5

Required Part

Main Fuse / Power Switch
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