This is a rear-entry tank with dual flush buttons. When flushed it fills but doesn't stop running and the float doesn't move. What is this type of mechanism called, to help me find more information? Could I fix it with individual parts or do I need a new toilet?
Hi @karl_s,
Welcome to the Bunnings Workshop community, it is wonderful to have you with us.
Please note that plumbing work needs to be completed by a licensed professional for safety and compliance.
You might like to start by having a read through my colleague @EricL's article on how to fix a leaking toilet.
There are two main parts inside your toilet. The inlet/fill valve, which is attached to and activated by the float, and the outlet/flush valve.
When the buttons are pressed, the outlet valve lifts up, allowing the water stored in the cistern to flow into the toilet bowl and complete the flush. Once the cistern has emptied, the valve drops back into place and seals the opening so the tank can refill.
As the water level drops during the flush, the float on the inlet valve also drops, which opens the valve and allows fresh water to refill the cistern. As the cistern fills, the float rises until it reaches the set level and shuts the inlet valve off.
From your description, it sounds like the inlet valve is the problem here.
With the water supply turned off, gently move the float up and down by hand and check that it travels freely without catching on the cistern wall or another component. If it feels stiff or stuck, inspect the mechanism for mineral build-up, debris or damage and clean as required. You can then briefly turn the water back on and assess the float. If the water stops without manually moving the float, the float mechanism was likely sticking due to debris buildup, but if it continues running, the inlet valve may need a new seal, cleaning or replacement.
If you could run some tests with the float and inlet valve, and let me know things go, I can certainly assist further. Also, if you could identify the model of your toilet, this can help us identify replacement parts if they are required.
Let me know how you go.
Jacob
Thanks for the detailed reply, JacobZ, I'm more familiar with the ball type of float. The float was not moving freely because it was touching the back wall of the tank. I twisted the big plastic dial and that fixed it. Thanks!
Brilliant! I love when there's a simple solution.
I'm glad to know it was sorted without too much trouble.
