Glow-worm Flow Sensor 0020014174 (Flexicom / Ultracom)

Genuine Glow-worm OEM flow sensor (black) for popular Flexicom and Ultracom boilers. The sensor sits in the hydraulic block and detects water movement, signalling demand to the PCB for fast, reliable hot water and heating response.

• Manufacturer: Glow-worm
• Part type: Flow sensor / flow switch (black)
• MPN: 0020014174
• GTIN / EAN: 4024074495261
• Typical kit contents: Flow sensor body, O-rings and spring clips (check your pack)

Compatible appliances (examples)

Used across Flexicom and Ultracom families (variant/year dependent). Confirmed fits include:

• Flexicom CX: 24CX, 30CX, 35CX
• Ultracom: 24CX, 24CXi, 30CX, 30CXi, 38CXi

Always verify against your boilers data plate/parts list for MPN 0020014174 before ordering.

What this part does

The flow sensor monitors water movement within the boilers circuit. When flow is detected, it informs the control board to ignite and modulate correctly, helping maintain stable DHW temperature and heating operation.

When to replace

• No DHW ignition or boiler fails to recognise a tap opening
• Intermittent hot water or fluctuating temperatures
• Physical damage, leaking O-rings, or faulty sensor output

What’s in the box

• 1 Glow-worm flow sensor 0020014174
• O-rings & spring clips (if included by supplier)

Installation & safety

Must be installed by a qualified Gas Safe engineer. After fitting, check for leaks, verify DHW activation/flow readings and clear any fault codes.