In our open-plan house with a gallery, we use a large wood-burning stove with an external chimney almost daily during winter; it was installed by a professional and has also been approved by the chimney service.
In the same room, we have a CO detector EI208D placed on a shelf at about 120cm (47 inches) height, which suddenly went off with a loud alarm at 3 a.m. last night. The device now shows a peak concentration of 80ppm as the highest recorded value.
The last piece of wood was added around 10 p.m., and as usual, we let the fire die down. When the alarm sounded, the fire had been out for 2–3 hours, with only a small piece of wood still glowing.
Of course, I will consult the chimney service, but perhaps someone here has experienced something similar or can offer some insight.
At the same time, the wall-mounted negative pressure monitor, brand LEDA, model Luc2, interrupted the operation of the mechanical ventilation system with heat recovery. We reactivated it afterwards, but shortly after, the LEDA device interrupted the ventilation again.
Unusually, there was a stronger than normal smell of cold smoke, even though the flames had been out for at least 2–3 hours.
It is possible that the last piece of wood was slowly smoldering, and for some reason, the draft did not work optimally. I also don’t fully understand the reaction of the LEDA device or the general connection between these events.
My initial feeling is that we will probably also add a similar CO detector for the bedroom on the upper floor.
In the same room, we have a CO detector EI208D placed on a shelf at about 120cm (47 inches) height, which suddenly went off with a loud alarm at 3 a.m. last night. The device now shows a peak concentration of 80ppm as the highest recorded value.
The last piece of wood was added around 10 p.m., and as usual, we let the fire die down. When the alarm sounded, the fire had been out for 2–3 hours, with only a small piece of wood still glowing.
Of course, I will consult the chimney service, but perhaps someone here has experienced something similar or can offer some insight.
At the same time, the wall-mounted negative pressure monitor, brand LEDA, model Luc2, interrupted the operation of the mechanical ventilation system with heat recovery. We reactivated it afterwards, but shortly after, the LEDA device interrupted the ventilation again.
Unusually, there was a stronger than normal smell of cold smoke, even though the flames had been out for at least 2–3 hours.
It is possible that the last piece of wood was slowly smoldering, and for some reason, the draft did not work optimally. I also don’t fully understand the reaction of the LEDA device or the general connection between these events.
My initial feeling is that we will probably also add a similar CO detector for the bedroom on the upper floor.
W
wiltshire9 Feb 2025 10:40If air-intake appliances such as a range hood or a mechanical ventilation system with heat recovery are operating at full capacity, and the combustion stove is either not completely sealed and/or draws air from the interior, this can cause the chimney draft to be insufficient to overcome the device’s suction, resulting in smoke and carbon monoxide entering the living space.
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