Programmers & Timeswitches
Programmers and time switches are used to control when domestic central heating systems operate by setting on and off schedules. This category includes mechanical and digital programmers, time switches, and related control units suitable for common UK heating installations.
Products are listed with clear specifications to help identify compatible replacements based on operating voltage (typically 230V AC), switching capacity, programme type (single-day, 7-day or multi-channel), and installation requirements for domestic heating and hot water systems. Installation and operating guidance is available via our product instruction library.
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£19.95A family of simple, reliable mechanical 24‑hour timer modules from TFC Group’s Optimum FM/1 range, supplied in several tab‑orientation variants so they’ll plug straight into many Baxi, Potterton, Alpha and Ideal boilers. They use a 24‑hour dial with 96 tappets, provide volt‑free changeover switching and a manual ON/Auto/OFF override — a low‑cost, proven spare for restoring original timed control.
FM Timer Module Variants OP-FM1STUZH
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A compact single‑module DIN‑rail digital timer for simple 7‑day or 24‑hour scheduling. The OP‑DIN offers six ON / six OFF events, an LCD for programming, rechargeable backup (≈100 hours) to retain clock and programmes during power loss, and a 16 A resistive switching contact — a neat, space‑saving choice for panel‑mounted lighting or heating control where sophisticated networking or heavy inductive switching is not required.
OP-DIN 1 Module 1CH Time Switch
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£15.79A compact 24‑hour synchronous plug‑in timer module for repeatable daily scheduling. The OP‑FM1STU00 uses 15‑minute captive tappets to control a single volt‑free SPDT output and is designed as a direct replacement for many wall‑hung boiler programmers and sub‑panel time‑switch applications. This variant has no manual override.
OP-FM1STU00 Timer Module 24 Hour
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£14.95A compact 24‑hour synchronous plug‑in timer module designed as a drop‑in replacement for many wall‑hung boilers and control panels. It uses captive 15‑minute tappets and a three‑position manual override (timed / fixed‑on / fixed‑off), and provides a volt‑free SPDT contact rated 16 A resistive / 8 A inductive for simple daily scheduling.
OP-FM1STUH0 Module With Override
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