Beretta Thermostat or Control Stuck On

Furnace runs continuously and overheats the house, does not shut off at set temperature

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.

Possible Causes

Stuck thermostat relay, Shorted thermostat wiring, Faulty room thermostat, Control board output stuck

Safety: You can temporarily turn off the furnace using the main switch or breaker.

Check thermostat: Turn the thermostat to OFF. If the furnace continues to run, the issue is not with the thermostat settings.
Inspect thermostat wiring: With power off, remove the thermostat and check that no wires are shorted together.
Disconnect thermostat at furnace: Remove the thermostat wires at the furnace control board. If the furnace still runs without a thermostat connected, the control board relay is likely stuck and needs replacement.

Hard 4/5

Room Thermostat

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