Why Does My Toilet Only Drain and Not Flush at 7 PM?

For the past few days, starting at around 7 PM, my toilet has been draining instead of flushing. This odd behavior is perplexing, especially since it only happens at this specific time. Could it be due to a partial clog in my building's main line? Here’s a closer look at the reasons behind this issue and some steps you can take to resolve it.

The Possible Cause: A Partial Clog in the Building’s Main Line

If you live in an apartment building, it’s plausible that a partial clog exists in the building's main line. At 7 PM, most residents return home and start using water-intensive activities like cooking or washing dishes. This can cause the main drain line to fill up and back up, especially if there is a partial clog. When the backed-up water reaches your toilet drain, the flush will initially rise before being slowly pulled down due to gravity. Once everyone stops using the water, the main line will clear, and flushing will return to normal.

Checking Neighbor’s Toilets

You might want to check if your neighbors are experiencing the same issue. This could be a clue that there is a partial clog in a main line that only affects the building during specific times. Since you have no plumbing experience, here are some steps you can take:

Steps to Take

Contact your landlord or local authority if you are renting the property. Buy a complete new toilet system if you own the property. Older toilets may have issues with flushing and finding compatible parts can be challenging. Call a professional plumber for comprehensive help and diagnosis. Check if holding down the flush handle improves the flushing action. Examine if water in the toilet bowl or other drains bubbles or gurgles.

Troubleshooting the Plumbing System

There are a couple of additional troubleshooting steps that can help diagnose the issue:

Checking the Vent Pipe

Plumbing systems have a vent that allows air to enter and exit the system, ensuring proper water flow. If this vent is obstructed, it can cause issues like a draining toilet. The vent pipe is usually located outside the building, either on the roof or near the roof. Inspect the vent for any nests, leaves, or pine needles that might be obstructing it. Clearing this vent can solve the problem.

Plunging to Clear the Drain Line

Using a plunger on the affected drain line might also help. Start by closing or stuffing a rag into all other drains in the building to create a better seal. Begin by plugging the drains in the top-most floor (usually a sink or bathtub) and work your way down to the sewage pipe. This will create a vacuum effect and help clear the clog.

Seek Professional Help

If the steps mentioned above do not resolve the issue, it’s essential to call a professional plumber. They can provide a thorough inspection and pinpoint the exact cause of the problem. Remember, a well-functioning plumbing system is crucial for the comfort and safety of your home.