Ideal Flow Switch Domestic Hot Water 174462

The Ideal domestic hot water flow switch, part 174462, is a safety component used across the Europa and Mini boiler ranges. It sits in the hot water circuit pipework and carries an internal sensor that detects water movement through the system. That signal is fed to the boiler's printed circuit board, which uses it to permit burner operation only when water is actually present, guarding the appliance against dry firing.

• The boiler fails to fire on a hot water demand while the heating circuit continues to work normally
• Hot water runs intermittently or cuts out part way through a draw-off
• A lockout or fault code relating to water flow or dry fire protection appears
• The burner ignites briefly and then shuts down shortly after a tap is opened
• No change in boiler behaviour when a hot tap is run, suggesting the board is receiving no flow signal

• Match the GC number on the appliance data plate against the compatibility list below
• Confirm the boiler model and serial number from the badge before ordering
• Note the alternative number 1780304 when cross-referencing older stock or documentation
• Inspect the seal or O-ring at the switch housing and renew it if it has hardened or perished