Utica Boiler Fails to Shut Off on Temperature

Boiler runs continuously and overshoots thermostat setting, house becomes too 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

Stuck relay on control board, Thermostat wiring shorted, Zone valve stuck open, Sensor miscalibration

How to Fix / Troubleshooting

Safety first: Turn off power before working on controls or wiring.

  • Check thermostat: Turn the thermostat to its lowest setting or OFF. If the boiler continues to run, the issue is not the thermostat setting.
  • Inspect thermostat wiring: At the Utica boiler, remove the thermostat wires from the TT terminals. If the boiler still runs, the control board or an internal relay may be stuck.
  • Zone valves: If using zone valves, ensure they are not manually opened or stuck in the open position.
  • Call a technician: A stuck relay or sensor miscalibration on the control board typically requires board replacement.
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Repair Difficulty

Hard 4/5

Required Part

Boiler Control Board
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