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What's causing Vaillant ecotec plus 438 boiler droning noise - Page 1 - Homes, Gardens and DIY - PistonHeads

What's causing Vaillant ecotec plus 438 boiler droning noise - Page 1 - Homes, Gardens and DIY - PistonHeads - The image shows a digital readout on a device, which displays various data points. The top line says "Flue Gas," followed by the timestamp "15:27:15" in parentheses. The next line "Natural gas" is accompanied by two numbers, "CO" and "NPP," suggesting some form of emissions monitoring. The subsequent "ppm" is paired with a value "9.1." The bottom two lines indicate a 'Ratio' of 0.00088 and a 'Pressure' of 0.185, both followed by "mBar," which likely stands for millibars. The symbols next to the pressure include a sheet of paper and a directional arrow, possibly indicating reference values or directional fluctuations of pressure. The overall setting suggests industrial or environmental monitoring, potentially at an industrial facility where flue gases are regulated and recorded.
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