Ariston Overheating / Poor Temperature Control

Furnace runs but room temperature overshoots the setpoint significantly.

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

Thermostat miscalibration, Thermostat near heat source, Stuck gas valve at high fire, Faulty modulation control

Safety: Overheating wastes energy and can stress the system.

Check thermostat location: Ensure it is not near radiators, sunlight, or appliances that emit heat.
Adjust thermostat settings: Some thermostats allow calibration; follow the manual to correct any offset.
Observe burner modulation: The burner should reduce flame as the setpoint is approached. If it stays at full fire, a technician must check the gas valve and control logic.

Medium 3/5

Gas Valve Assembly

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