Overview of the Toilet Issue

At a property on Edinburgh Street in Clayton VIC 3168, our team at Your Choice Plumbers was called out after the owner reported that the toilet would no longer flush properly because the cistern was not refilling consistently.

The client explained that the problem had been happening on and off for some time. Sometimes the toilet would refill after flushing, and other times it would not. This time, it stopped refilling altogether, which prompted them to finally call a plumber.

This is exactly the type of issue where homeowners start asking, “why is my toilet not filling up after I flush?” or “why does my toilet sometimes refill and sometimes not?” As an experienced plumber Clayton, we often find that when a toilet stops refilling properly, the fault usually comes down to one of two things — either the water supply valve is not delivering water correctly, or the inlet valve inside the cistern is failing.

Initial Diagnosis and Key Clues

From the symptoms the client described, we knew the problem was most likely related to the cistern refill process rather than the flushing mechanism itself.

When a toilet does not refill after flushing, the most common causes are:

  • a seized or restricted stop tap / mini stop valve
  • a faulty inlet valve not opening properly to refill the tank

That gave us a clear diagnostic path.

Step-by-Step Diagnosis

Our first step was to confirm whether the toilet was receiving water from the supply valve correctly.

We disconnected the flexible hose connecting the mini stop valve to the inlet valve and tested the mini stop for proper operation.

The water supply from the valve was operating correctly, which allowed us to rule out the external isolation valve as the cause of the fault.

That meant the problem was inside the cistern.

With the supply valve confirmed to be working, the fault was clearly the inlet valve not opening and filling the tank as it should.

Repair and Toilet Restoration

To restore correct toilet operation, we supplied and installed a new:

Performa Toilet Cistern Bottom Inlet Valve

The replacement part was sourced from Reece Plumbing Clayton.

We then:

  • installed the new bottom entry inlet valve
  • adjusted it to the correct water level
  • tested the cistern operation
  • confirmed the toilet was refilling properly with no further issues

Once installed and adjusted, the toilet returned to normal function and filled reliably after flushing.

Critical Compliance Finding – Water Pressure

As part of our repair and product warranty process, we also checked the water pressure at the water meter.

The pressure reading was above the allowable limit under AS/NZS 3500, which is something we commonly find in Melbourne homes.

Excessive water pressure can:

  • shorten the life of inlet valves
  • place extra stress on toilet internals
  • contribute to ongoing plumbing wear across the home

After explaining this to the owner, we proceeded with a compliance upgrade.

Pressure Regulation Upgrade

To protect the plumbing system and bring the property closer to compliant operating conditions, we installed a pressure regulating valve at the water meter.

This not only supported the repair we had just carried out on the toilet, but also helped protect the wider plumbing system from future pressure-related wear.

The owner was very happy not only to have the toilet repaired, but also to have the added protection of proper pressure regulation.

Outcome and Client Result

  • toilet refill issue accurately diagnosed
  • faulty inlet valve identified and replaced
  • cistern water level correctly adjusted
  • toilet restored to reliable operation
  • high water pressure identified
  • pressure regulating valve installed for system protection

The owner was pleased with both the repair outcome and the preventative upgrade.

Compliance & Prevention Insight

This case highlights why toilets that “sometimes refill and sometimes don’t” should not be ignored.

Intermittent refill problems usually indicate a component that is already failing and will eventually stop working altogether. It also shows why checking water pressure as part of the diagnosis is valuable, because excessive pressure can shorten the life of toilet inlet valves and other plumbing fixtures throughout the home.

Compliance with Australian Standards

All work carried out by Your Choice Plumbers is completed in accordance with the relevant plumbing standards, including the pressure requirements referenced under AS/NZS 3500, helping ensure toilet repairs and water pressure control are performed safely and correctly.

In simple terms, this means your toilet is repaired properly and your water pressure is checked to help protect the rest of your plumbing system from avoidable damage.

Our Home Plumbing Experts Approach

As part of our Home Plumbing Experts approach, we focus on both repair and prevention.

We offer a Complimentary Property Protection Audit as part of our service, assessing key areas like water pressure, hot water temperature, and flexible hoses — helping homeowners stay ahead of potential plumbing failures and avoid unexpected water damage.

👉 Find out more about our leaking toilet repairs Melbourne services.