Description
Replacement Boiler Timer Modules – Mechanical Boiler Time Controls (FM/1 Series)
The FM/1 Series Mechanical Boiler Timer Modules are proven, synchronous motor–driven time controls used extensively across the UK boiler industry. Supplied by TFC Group since the late 1980s, over 20 million units have been fitted by leading boiler manufacturers, making the FM/1 one of the most widely used mechanical timer platforms in the domestic heating market.
Operating on a 220–240V AC, 50Hz supply, all FM/1 variants provide volt-free switching and dependable daily time control. Their robust mechanical design ensures long service life, straightforward replacement, and continued popularity in the boiler spares market.
The Optimum FM/1 range includes four key variants, each designed to suit specific terminal orientations and boiler models.
🔹 STANDARD Variant
FM/1 Standard Mechanical Timer Module
Product Code: OP-FM1STUZH
The STANDARD FM/1 variant is designed for installations using standard tab terminal connections. It operates on a 220–240V AC, 50Hz supply connected to terminals 1 and 2, with volt-free switching available on terminals 3, 4, and 5.
This variant is commonly used as a direct replacement in a wide range of legacy and current boiler models.
Part & Compatibility Information:
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Baxi Part Code: 247206
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Compatible Models:
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Baxi: Platinum, Duo-Tec, Gold
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Main: 24HE, 30HE
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Potterton: 80E, 105E, Performa 24, Performa 28
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🔹 W18 Variant (Vertical Tabs)
FM/1 W18 Mechanical Timer Module
Product Code: OP-FM1STUZH18
The W18 FM/1 variant is designed for boilers requiring vertical tab terminal connections. It operates on a 220–240V AC, 50Hz supply via terminals 1 and 2, with volt-free switching on terminals 3, 4, and 5.
This version is widely used in Ideal combination boilers and provides a direct replacement for multiple platform variants.
Compatible Ideal Boilers:
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UIN204839: Logic, Logic+
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UIN201168: Esprit
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UIN201391: Excel
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UIN208445: IXUS, Vogue
🔹 W9 Variant (Right-Hand Tabs)
FM/1 W9 Mechanical Timer Module
Product Code: OP-FM1STUZH09
The W9 FM/1 variant is designed for installations requiring a right-hand tab terminal configuration. It operates on a 220–240V AC, 50Hz supply to terminals 1 and 2, with volt-free switching provided on terminals 3, 4, and 5.
This variant is commonly specified for modern Baxi combi boiler platforms.
Part & Compatibility Information:
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Baxi Part Code: 7658276
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Compatible Models:
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Baxi 200 combi boilers
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Baxi 400 combi boilers
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🔹 W27 Variant (Left-Hand Tabs)
FM/1 W27 Mechanical Timer Module
Product Code: OP-FM1STUZH27
The W27 FM/1 variant is suitable for boilers requiring a left-hand tab terminal configuration. It operates on a 220–240V AC, 50Hz supply via terminals 1 and 2, with volt-free switching on terminals 3, 4, and 5.
This variant is used across multiple Alpha and Baxi boiler ranges.
Part & Compatibility Information:
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Alpha Part Code: 6.1000201
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Compatible with all Alpha combi boilers
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Baxi Part Code: 7212341
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Compatible with Baxi Eco Blue combi boilers
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