The small U shaped gauge on your radon pipe is called a manometer. When the liquid on both sides sits level, the system is not pulling suction. We connect York homeowners with a local contractor who checks the whole system to find out why, so you fix the real problem instead of guessing.
What the Manometer Tells You
A manometer measures the difference in pressure between the inside of the pipe and the room around it. When the fan is pulling suction, the liquid on one side rises and the other side drops. That uneven reading is what you want to see.
When the liquid levels are even, there is no measurable suction in the pipe. That can mean the fan is off, the fan has failed, or something is letting air into the pipe so the fan cannot build suction under the slab.
Many installers mark the starting level on the gauge. If yours has a mark, compare the current reading to it. A slow drift toward even over months can be an early sign that something is changing, even before the gauge goes completely flat.
What a Checkup Looks At
A checkup starts with the simple things. Is the fan getting power? Is the breaker on, and is any switch near the fan turned off? Is the fan spinning? Many flat readings are solved at this step.
If the fan has power and runs, the contractor looks for leaks. A cracked pipe, a loose coupling at the fan, or a joint that has pulled apart lets air in and kills suction. The gauge itself can also be the problem if its tubing has come loose or the liquid has evaporated.
- Power to the fan and the breaker
- Fan operation and sound
- Pipe joints and couplings
- Gauge tubing and liquid level
- Slab openings and sump lid
Only after those checks does the contractor recommend replacing parts.
Fixing the Cause
Once the cause is found, the fix is usually straightforward. A failed fan is replaced. A cracked pipe section or a loose coupling is replaced and sealed. A gauge with dry or loose tubing is refilled or reattached. An opened sump lid or a new crack in the slab is sealed.
After the repair, the contractor reads the manometer again to confirm suction is back, then marks the new level on the gauge so you have a reference.
A short-term radon test after the repair is a good idea, especially if the gauge had been flat for a while. It confirms that the level in your home has dropped back down. Write the date of the repair and the test result in your home records so the next checkup has a starting point.
Find Out Why the Gauge Went Flat
A flat manometer does not always mean a dead fan, and a careful checkup saves you from buying parts you do not need. Having the plan in writing makes the decision easier and the follow-up simpler. Clear answers up front tend to make the rest of the process calm and predictable. A careful look at the house is always the best starting point. Call us and we will connect you with a local contractor who will diagnose the system at your York home and explain the fix in writing.
Frequently Asked Questions
What does a flat manometer usually mean on a radon system?
A flat manometer means there is no measurable suction in the pipe. Common causes are a fan without power, a failed fan, a cracked pipe or loose coupling, or a problem with the gauge itself. A checkup confirms which one it is before any parts are replaced.
How soon can a system with no visible suction be checked?
Most checkups can be scheduled within a few business days. Before you call, check that the breaker and any switch near the fan are on. While the gauge is flat, the system is not lowering radon, so it is worth getting it looked at soon rather than waiting for your next test.
Is a flat reading always a failed fan, or could it be a pipe leak?
It could be either. A fan that runs but cannot build suction often points to a leak at a pipe joint or coupling, or an open sump or slab gap. A fan that is silent or grinding is more likely the problem. The contractor checks both before recommending a fix.