Viadrus Flue Spillage / Draft Failure

Boiler’s flue gas spillage safety device (on open-flue Viadrus models) trips, shutting down the boiler.

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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

Blocked chimney or flue, Insufficient ventilation in boiler room, Faulty draft diverter, Defective flue gas thermostat

How to Fix / Troubleshooting

Safety first: Flue spillage can cause carbon monoxide poisoning. Do not attempt to bypass or reset safety devices without addressing the cause. Ventilate the area and do not use the boiler until safe.

Step-by-step checks (visual only):

  • 1. Check ventilation: Ensure all air vents to the boiler room are open and unobstructed.
  • 2. Inspect chimney externally: Look for obvious blockages (nests, debris) at the chimney terminal.

Professional actions: A chimney sweep or heating engineer must inspect and clear the flue, test draught, and verify operation of the spillage device.

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Repair Difficulty

Professional Required 5/5

Required Part

Flue Gas Spillage Thermostat
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