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Discuss Intermittant F22 in Vaillant Combi Bolier Turbomax Plus 828 E in the New Member Introductions area at

  1. Mr Satish Saxena

    Mr Satish Saxena New Member

    I have Vaillant Combi Bolier Turbomax Plus 828 E.
    About four years ago, the Engineer having serviced the boiler, forgot to open up the water valves of Magnaclean and problem of F22, started since then.
    Not always but some times F22, appears which does not allow Hot water or Central Heating to come together.
    On hot water mode no problem for hot water to come.
    My heating Engineer is not sure of the problem. He thinks it could be the PUMP or DIVERTER VALVE.

    One heating engineer also suggested fault could be
    due to Printed Circuit Board.

    What would you suggest to resolve the problem?
  2. Gasmk1

    Gasmk1 GSR

    Get a different heating engineer normally quite easy fix
    • Like Like x 1
  3. Harvest Fields

    Harvest Fields S. Mod Trusted Plumber GSR Top Contributor!!

    Actually. What is the pressure gauge on?
  4. Last Plumber

    Last Plumber Trusted Plumber GSR

    An Experienced Heating Engineer should sort that with no problem at all.
  5. Mr Satish Saxena

    Mr Satish Saxena New Member

    The pressure is 1.5 bar
    Magnaclean Filter was definitly left closed. Neither we were getting Hot Water nor Central Heating.
    When the Engineer came back, he turned on the inlet and outlet valves of the Magnaclean and apologised as he was not familiar with Magnaclean.
    Since then it has been checked for F22 by British Gas Engineer, Scottish Power Engineer who installed External Expansion Vessel in April 2017, three other engineers plus our regular Vaillant Heating Engineer.
    In 2016, Hot Water Heat Exchange Thermal Unit and Sentinel x100 Central Heating Scale Inhibitor was put in by our regular Engineer.
    He thinks it could be either Pump or Diverter Valve.
    Recently somebody suggested Power Flush and then replace the Pump. 14 Feb. 2019
  6. Last Plumber

    Last Plumber Trusted Plumber GSR

    If all those people are failing to find the solution, phone Vaillant and book one of their Engineers.
  7. Mr Satish Saxena

    Mr Satish Saxena New Member

    Thank you
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