The Worcester Bosch 77161920020 CDi Mechanical Timer is a genuine replacement control accessory designed to provide simple, reliable scheduling for your boiler’s heating and hot water cycles. This mechanical timer allows you to set on/off periods throughout the day so your central heating and hot water operate when you need them most, helping improve comfort and energy efficiency. Its straightforward dial and switch design make it easy to adjust times and understand current settings at a glance.

This mechanical timer is compatible with Worcester Bosch CDi series boilers that specify part number 77161920020 for manual time-control functionality. To ensure correct fitment and operation, always check the existing part number on your boiler’s timer or consult the boiler’s documentation before installation, as control interfaces and part configurations can vary between models.

Designed for direct replacement, the 77161920020 CDi Mechanical Timer mounts in place of the original unit and interfaces with the boiler’s control wiring without modification. Choosing this genuine Worcester Bosch timer helps restore simple, dependable time control over your heating and hot water routines in compatible CDi boilers.