Toilet Repair Guide: Common Problems and How to Fix Them

What You Need to Know About Toilet Repair

Toilet problems are not as difficult as you might think. I've seen this many times, where a homeowner calls a plumber for a 5-minute fix, and I'm saying this as someone who spent years on the tools. The working parts inside your cistern include the fill valve, the flush valve (or flapper), the overflow tube, and the flush button mechanism. If you have a problem, it will probably be with one of these components. In most cases, you don't need a licence to fix a toilet, as long as you don't need to make any modifications to the mains connection, or if you need to work on a pipe underneath the pan. Otherwise, tasks such as replacing a flapper, adjusting a float or replacing a flush button are well within the capabilities of an average homeowner. Note that in Australia, you need a licensed plumber to make any modifications to a mains water supply or a pipe under the toilet pan. Ignoring most toilet problems will only make them worse. If your cistern is running constantly, you might only be losing a few litres per hour, but if you leave it for six months, you'll feel the difference in your water bill.

Common Issues and Their Causes

The following are some of the most common problems that I've encountered: A toilet not flushing properly could be because of a faulty flapper valve, or a partial blockage in the rim jets. The flapper valve is what allows the water to flow from the cistern into the bowl when you press the button. Over time, the rubber valve deteriorates, and it won't create a seal, which means that you get a poor flush, or the water will just slowly leak through. Toilet gurgling is probably caused by a roof vent blockage. Air pressure in your drainage pipes is disrupted, which could also indicate a partial blockage elsewhere in your system. Running constantly is probably the most common complaint. This is when the cistern fills with water, and then the water just keeps running, either through the flapper valve, or into the overflow tube. In 90% of cases, this is because the fill valve needs adjusting or replacing. If the toilet leaks at the bottom, then it's because the wax ring seal between the pan and the floor flange has failed. This requires immediate attention because any water that sits underneath the toilet can damage your subfloor.

Step-by-Step Solutions

Toilet repair for a weak flush starts with checking the flapper valve. Turn off the isolation valve behind the toilet, then flush the toilet to empty the cistern. You can now inspect the rubber valve. If it has warped, cracked, or if there are mineral deposits on it, you need to replace it. A flapper valve typically costs between $10-$25, and it should take about 10 minutes to replace. If you find that the bowl doesn't clear properly, then it's probably because of blockages in the rim jets that sit just under the rim of the bowl. Over time, they get clogged up with mineral deposits. You should be able to clear them out with a stiff brush, or a piece of wire, and if there are any calcium deposits, you can leave them to soak in a bit of white vinegar overnight. If your cistern won't stop running, then the first thing to do is take the lid off and observe the water level. If the water level is rising above the overflow tube, adjust the float on the fill valve. Most fill valves have a screw or clip that lets you adjust the water level. If adjusting the float doesn't fix the problem, then the fill valve itself needs to be replaced. This takes about 20 minutes, and the part costs between $15-$40.

Advanced Troubleshooting

While some jobs are simple, there are others that sit somewhere in between DIY and calling in a professional. If you have replaced the flapper and fill valve and the toilet still seems to be running, it could be that the flush valve seat is damaged. Either mineral deposits or tiny pits in the seating surface can mean the flapper is not sealing correctly. In this case, it is relatively easy to use a flush valve seat repair kit to resurface the seat without removing the cistern. The kit costs around $20 and is a quick fix. Another common problem is a faulty toilet inlet valve. The toilet inlet valve controls the amount of water that is allowed into the cistern, if you find that the water pressure seems to be irregular, or if it takes a long time to fill, or if you hear a whining noise while the toilet is filling, it may be that the valve is partially blocked with mineral scale.

Prevention and Maintenance

The most effective way of ensuring you do not have any problems with your toilet is to check the cistern every six months. Lift the lid and check for wear on the rubber components, check the float level, and inspect the valve seats for mineral build-up. If you know how to fix toilet flush button issues, you can avoid what is probably one of the most annoying problems that homeowners face. The flush button mechanism is connected to the flush valve via a cable or a rod, and over time these can loosen. If the button is wobbly, all that you usually need to do is tighten the connection. You can get replacement toilet flush button assemblies for most brands, and they are simple to install. It is also a good idea to keep a basic repair kit on hand: a spare flapper valve, some washers, an adjustable spanner, and a pair of multigrips. If you have these available, you can fix most common problems on the same day. Make sure you check the inlet valve toilet components every time you do maintenance. These parts have a lifespan of about 5-7 years and proactively replacing them is much cheaper than having to deal with water damage from a failed valve. It's also a false economy to buy cheap replacement parts. A quality Geberit component will outlast the no-name brands by a long way.