Fluidzon / Troubleshooting
Schwab Cistern Not Flushing Any Water
Pressing the flush button produces no water flow at all — the cistern does not flush
Identify the model first.
The same symptom can have different causes. Confirm the cistern label, installation generation and applicable manufacturer instructions. Use only safely accessible checks; ask technical support when unsure.
Help identify my cistern →Check 01
Check the Angle Stop Valve
The simplest cause: the cistern is empty because there is no water supply. All three Schwab troubleshooting documents (models 187, 198, 199) list this as the first check. Locate the angle stop valve on the supply pipe feeding the cistern and make sure it is fully open. In UAE apartments, these valves are sometimes turned off during maintenance and not reopened.
Check 02
Check the Activating Lever / Lifting Mechanism
The second most common cause across all three models: the activating lever is not hooked into the outlet valve lifting eye. This means pressing the button moves the push rod, but the rod is not mechanically connected to the valve that releases water. On model 199: Make the correct connection between the lever and valve lifting eye. On model 187: The activation unit can become loose. Open the access panel and check that the activating lever is properly hooked into the valve lifting eye. The Schwab documentation for model 187 shows a specific bridge assembly — press the bridge to the left to block the activation unit in place. On model 198: Make the correct connection. Check that the lever mechanism is seated and that no parts have come loose.
Check 03
Check for Blocked Outlet Pipe (Models 187 & 198)
Models 187 and 198 have an additional documented fault not listed for model 199: a blocked outlet pipe. If the cistern has water, the valve opens when flushed, but no water reaches the bowl, the outlet pipe between the cistern and toilet pan may be blocked. Solution: Remove the toilet pan and check the outlet pipe for blockages. This is a less common but documented fault that requires removal of the toilet pan to inspect.
These checks provide context for a support enquiry. Confirm any replacement article against the exact model drawing and manufacturer instructions.
Find the model parts catalogue →Technical support · UAE
The right part starts with the right model.
Have a label, an article code or an old part? Share the details with our technical team.