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We purchased a home a few years ago and it has a radon mitigation system. I just happened to go downstairs and look at it and noticed this reading. What should I check? Should I be alarmed?

meter photo

EDIT

Thank you for the link to the manual. The fan is on a pipe coming out of the house and is plugged in to the outlet on the side of the house. I can't tell (tried both listening and feeling for vibration) if it's running and I checked to ensure that the breaker hadn't been flipped.

As for checking the oil - I haven't quite been able to figure out how to do that.

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I'm guessing this system has a fan. Is it still running? –  BMitch Nov 10 '12 at 21:19
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The fan would have to run backwards to get that reading. Disconnect the supply tube and try to adjust to zero. If you can't, try the fill button. If that doesn't work, you probably need more gauge oil. –  bcworkz Nov 10 '12 at 22:15
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Here is a link to the manual; dwyer-inst.com/PDF_files/mark2_iom.pdf –  timquinn Nov 12 '12 at 7:56
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To check if the fan is working, you can put a plastic bag over the end of the exhaust pipe and see if it inflates. Gauge oil is just the orange fluid that goes in the manometer (pressure meter) tube that indicates the pressure difference being driven by the fan. If it is missing or low, then it could give the negative reading. It should go to zero when the fan if off (as long as the wind isn't blowing too hard). –  littleturtle Nov 24 '12 at 18:34
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@BMitch ultimately what happened was that the fan had stopped running. I don't know why/how it stopped working, but we had someone come out and check it and they unplugged it and plugged it back in and it started working. –  swasheck May 16 '13 at 14:33

1 Answer 1

up vote 4 down vote accepted

To check if the fan is working, you can put a plastic bag over the end of the exhaust pipe and see if it inflates. Gauge oil is just the orange fluid that goes in the manometer (pressure meter) tube that indicates the pressure difference being driven by the fan. If it is missing or low, then it could give the negative reading. It should go to zero when the fan if off (as long as the wind isn't blowing too hard).

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