Beretta
No Heat Output / Burner Not Firing
Furnace runs but produces no heat, supply air is cold or only slightly warm
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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
Gas supply turned off, Faulty gas valve, Ignition failure not reaching lockout yet, Faulty thermostat not calling for heat continuously
How to Fix / Troubleshooting
Safety: If you smell gas, shut off the gas supply, ventilate the area, and call emergency services.
- Verify thermostat demand: Ensure the room thermostat is set correctly and that the furnace is actually receiving a heat demand (heating symbol on display, if available).
- Check gas cock: Confirm the manual gas shutoff valve near the Beretta furnace is fully open (handle parallel to the pipe).
- Observe ignition: Through the sight glass, watch the startup sequence. If the fan runs but there is no ignition attempt or flame, an ignition or gas valve fault is likely and requires a technician.
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Repair Difficulty
Hard
4/5
Required Part
Gas Valve Assembly
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