Vaillant Microswitch Lever 18-8110 18-8112 0020107700

VUW TURBOMAX

The Vaillant Microswitch Lever (Part No. 0020107700) — previously listed as 18-8110 and 18-8112 — is a genuine OEM replacement lever arm designed for use in Vaillant boilers to activate the microswitch within the flow sensor or diverter valve assembly. This precision-engineered lever ensures smooth and reliable mechanical operation, transferring motion from the hydraulic component to the electrical switch, allowing correct boiler response for hot water and heating demand.

Manufactured from durable, heat- and wear-resistant polymer, the 0020107700 lever is designed to withstand repeated use and temperature fluctuations, ensuring long-lasting, fault-free performance within the boiler’s control mechanism.

Key Features

• Genuine Vaillant microswitch lever – Part No. 0020107700

• Replaces 18-8110 and 18-8112 versions

• Ensures precise activation of the microswitch within flow or diverter assemblies

• Manufactured from durable, heat-resistant material

• Maintains accurate boiler control for hot water and heating demand

• OEM-quality component – reliable fit and long service life

• Designed for quick and easy replacement during maintenance

• Suitable for domestic Vaillant combination boilers

Compatibility

• Fits a range of Vaillant VCW, TURBOmax, ecoMAX, and MAG boiler models

• Used in diverter valve, water section, and flow switch assemblies

• Compatible with microswitches 12-6262 (DEC-55) and similar types

When to Replace

• If the boiler fails to detect flow or heating demand

• When the existing lever is cracked, worn, or bent

• During microswitch or diverter valve servicing

Technical Specifications

• Manufacturer: Vaillant

• Part Number: 0020107700

• Previous Numbers: 18-8110 / 18-8112

• Component Type: Microswitch lever arm

• Material: Heat- and wear-resistant polymer

• Function: Transfers motion to activate the microswitch

• Application: Vaillant boiler flow and diverter valve assemblies