Softener installed but no water flows through it (no supply to house)

Safety first: Know the location of the main stopcock before altering any valves.

• Verify plumbing orientation: Check that the pipe marked 'IN' on the Monarch valve is connected to the mains supply and 'OUT' to the house. Reverse connections can block flow.
• Check bypass set: Ensure the inlet and outlet valves are open and the bypass valve is closed.
• Open isolation valves: Confirm any additional service valves installed by the plumber are fully open.
• Clean inlet strainer: If debris from installation has blocked the strainer, remove and clean it as per E01.