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  • Home
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  • About Us
    Show sub menu
    • Boiler Fault Finder
    • Testimonials
    • Disclaimer
  • Sequence of Boiler Operation
  • Service Engineer’s Toolkit
  • Boiler Servicing Procedure
  • Boiler Fault Diagnosis
    Show sub menu
    • Sequence of Boiler Operation
    • Boiler Servicing Procedure
    • General Fault finding (£)
      Show sub menu
      • Burner Not Igniting (£)
      • Boiler Shuts Down
      • Blocked plate exchanger (£)
      • Domestic Hot Water Faults (£)
      • Explosive Ignition (£)
      • Faulty printed circuit board (£)
      • Fan Problems (£)
      • Noisy Heat Exchanger (£)
      • Noisy Hot Water Flow Switches (£)
      • Noisy Solenoid (£)
      • Noisy Fan (£)
      • Noisy Pump (£)
      • Pressure Relief Valve Problems (£)
      • Radiator Problems (£)
    • System Component Testing
      Show sub menu
      • Circulating Pumps
      • Boiler Fans
      • Thermistors
      • Potentiometers (£)
        Show sub menu
        • Potentiometers Intro (£)
        • How to test a potentiometer (£)
      • Thermostats (£)
        Show sub menu
        • Thermostats – Liquid Expansion (£)
        • Thermostats – Over heat Cut Out (£)
      • Air Pressure Switches (General)
        Show sub menu
        • Air Pressure Switches – Testing
      • Flame Detection Electrode
      • Domestic Hot Water Flow Switches (£)
      • Primary Water Flow Switches (£)
      • Domestic hot water and primary micro switches (£)
      • Low water pressure switches (£)
      • Solenoids & Moduregs (£)
      • Actuator Heads (motorised valves) (£)
      • Synchronous motors (within zone valves) (£)
      • Y Plan (3 port mid-position valve) (£)
      • S plan (HW zone valve and HTG zone valve) (£)
      • Motorised valve heads (diverter valves) (£)
      • Diverter valves (£)
      • Room thermostats (£)
      • Cylinder thermostats (£)
      • Spark electrode(s) (£)
    • Safe use of Multimeter Functions
    • Electrical Safety Checks
      Show sub menu
      • Earth Continuity Test
      • Mains Voltage Test
      • Short Circuit
      • Resistance to Earth
      • Mains voltage and polarity tests
      • 240 V TEST
    • Service Engineer’s Toolkit
    • Top Tips for the Heating Engineer
    • Maximising boiler condensation operation
    • Programmer and Time Switch Guides (£)
      Show sub menu
      • Terminal Comparisons 1 (£)
      • Terminal Comparisons 2 (£)
      • Terminal Comparisons 3 (£)
      • Terminal Comparisons 4 (£)
      • Terminal Comparisons 5 (£)
    • Notching and Drilling (£)
    • Asbestos (£)
      Show sub menu
      • Potterton Myson (£)
      • Gloworm (£)
      • Caradon Ideal (£)
      • Vaillant (£)
    • FAQ
    • This MANUAL PDF (£)
    • Boiler Manuals (£)
    • Heating Engineers Templates (£)
  • Top Tips for the Heating Engineer
  • Manufacturer Boiler Manuals
    Show sub menu
    • MFG A-F
      Show sub menu
      • ACV Boiler Manuals
      • Alpha Boiler Manuals
      • ATAG Boiler Manuals
      • ARISTON Boiler Manuals
      • ATMOS Boiler Manuals
      • BAXI Boiler Manuals
      • BIASI Boiler Manuals
      • BOULTER-BURDERUS Boiler Manuals
      • BRITISH SCOTTISH GAS Boiler Manuals
      • BROAG REMEHA GAS Boiler Manuals
      • CHAFFOTEAUX Boiler Manuals
      • ETHOS Boiler Manuals
      • EVO Boiler Manuals
      • FERROLI Boiler Manuals
    • MFG G-N
      Show sub menu
      • GLOW WORM Boiler Manuals
      • HALSTEAD Boiler Manuals
      • HEAT LINE Boiler Manuals
      • HERMANN Boiler Manuals
      • HRM Boiler Manuals
      • IDEAL Boiler Manuals
      • JOHNSON and STARLEY Boiler Manuals
      • KESTON Boiler Manuals
      • LAMBORGHINI Boiler Manuals
      • MAIN Boiler Manuals
      • MYSON Boiler Manuals
    • MFG P-Z
      Show sub menu
      • POTTERTON Boiler Manuals
      • PROTHERM Boiler Manuals
      • RADIANT Boiler Manuals
      • RAVENHEAT Boiler Manuals
      • SABRE Boiler Manuals
      • SAUNIER DUVAL Boiler Manuals
      • SIME Boiler Manuals
      • TRIANCO Boiler Manuals
      • VAILLANT Boiler Manuals
      • VIESSMANN Boiler Manuals
      • VOKERA Boiler Manuals
      • WORCESTER Boiler Manuals
      • ZANUSSI Boiler Manuals
  • Boiler Error Codes
    Show sub menu
    • Alpha
    • Atag
    • Baxi
    • Glow Worm
    • Grant
    • Ideal
    • Main
    • Potterton
    • Rinnai
    • Vaillant
    • Viessmann
    • Worcester
  • Articles
    Show sub menu
    • Posts
    • Documentation
    • Sitemap
  • Directory
    Show sub menu
    • ADD your business
    • Boiler Installation
    • Boiler Repairs
    • Boiler Servicing
    • Gas Certification
  • My Account
    Show sub menu
    • Buy a Membership to BFF
    • Membership Account
    • Membership Checkout
    • Buy the Printed BFF Manual
    • Free Boiler FF Manual
    • eBook Review
    • Membership Cancel
  • Contact Us

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