Glowworm Swiftflow 70E 80E 100E Boiler Flow Switch 2000800136

Product Overview

The Glowworm Boiler Flow Switch (Part Number: 2000800136) is a domestic hot water flow-detection component designed for selected Glowworm Swiftflow combination boilers.

The flow switch forms part of the boiler's domestic hot water system, detecting water flow when a hot water tap is opened and providing a signal to the boiler's control system.

This allows the appliance to recognise domestic hot water demand and initiate the appropriate operating sequence.

Correct flow switch operation is important for reliable hot water activation and normal boiler performance.

ℹ️ Product Condition Options:

This part may be available in New or Refurbished condition. Please select your desired option from the dropdown menu above. Refurbished flow switches should be professionally inspected and tested to confirm correct operation and suitability for installation.

Technical Insight & Common Failure Symptoms

The domestic hot water flow switch responds to water movement through the boiler's hot water circuit. Its switching function allows the electronic controls to recognise when domestic hot water is required.

Mechanical deterioration, internal restrictions, damaged electrical connections or faults affecting the switching mechanism may interfere with correct flow detection.

Possible symptoms that may indicate a flow switch or associated component problem include:

• Boiler failing to activate when a hot water tap is opened.

• Intermittent domestic hot water operation.

• Boiler failing to recognise hot water demand.

• Hot water operation starting or stopping unexpectedly.

• Inconsistent response to changes in water flow.

• Flow switch failing to operate correctly during professional testing.

• Visible damage or deterioration affecting the switch or its connections.

These symptoms do not necessarily confirm a faulty flow switch, as similar problems may result from restricted water flow, blocked inlet filters, electrical wiring or other boiler controls. Correct professional diagnosis should be carried out before replacing the component.

Safety Advice

Boiler flow switches and associated hydraulic components should only be inspected, removed or installed by a suitably qualified heating engineer. Where work involves internal gas appliance systems, an appropriately qualified Gas Safe registered engineer must carry out the work.

Always isolate the appliance's electrical supply and domestic water inlet before carrying out any work. Allow the system to cool and safely release residual water pressure before removing the component.

Follow the manufacturer's installation and servicing instructions. Ensure the flow switch is correctly positioned, with the flow direction matching the manufacturer's requirements, and that all necessary seals and electrical connections are correctly fitted.

Appropriate leakage, electrical safety, domestic hot water operation and functional checks must be completed before returning the boiler to service.