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  1. hertsboilers

    BAck boiler service

    What is the boiler make and model then? If it is an old back boiler, there is no need to use FGA.
  2. hertsboilers

    Reverse circulation

    More likely a let by the middle position valve.
  3. hertsboilers

    Reverse circulation

    http://www.hertsboilers.co.uk/blog.htm#3 What is reverse circulation?
  4. hertsboilers

    Sabre Boiler Producing High Carbon-Monoxide Readings

    Pay Vokera engineer's visit, and don't pay for your own engineer.
  5. hertsboilers

    Sabre Boiler Producing High Carbon-Monoxide Readings

    Again, what is the exact model of this boiler?
  6. hertsboilers

    Rented property - no room thermostat

    EPC is there for purpose. Being bit low efficiency is not a sound reason to ask a landlord to upgrade the system. I have seen so many cases that GRIs suggested new boilers to tenants while doing landlord safety checks.
  7. hertsboilers

    Rented property - no room thermostat

    This install doesn’t have a room stat, but it should be reflected in the EPC score. So if the tenant had been shown the EPC, and agreed to rent the property, then there is no problem. I have seen so many properties without room stats.
  8. hertsboilers

    Ideal Logic Heat 18 a mind of its own :)

    What is your middle position motorised valve?
  9. hertsboilers

    Worcester 24i DHW problem

    You spot on!
  10. hertsboilers

    Worcester 24i DHW problem

    Might be a circulation problem to cause over heat. Check the pump.
  11. hertsboilers

    Worcester 24i DHW problem

    No one suggested a water pressure top up?
  12. hertsboilers

    New Boiler advice

    Go for Vaillant cylinder! Heatra Sadia's cylinders have internal air gaps, which are always failed.
  13. hertsboilers

    Sabre Boiler Producing High Carbon-Monoxide Readings

    The engineer should leave paper work with measured data on site. Do you have it? If CO is high, and how high it is?
  14. hertsboilers

    Installing nest, help please

    As Andrew said, connect two commons to the live. Also old HW off to new HW satisfied (4).
  15. hertsboilers

    Baxi solo 3 firing up but not heating water or radiators

    look like failed on main burner being light on. a few things to check: gas valve, electrodes & sparking, and pilot injector. Need a boiler repair man.
  16. hertsboilers

    How clear should central heating water be?

    What boiler and what is your system? Open or combi, or sealed? I am not a big fun of powerflush, but sometimes you have to do it. The water inside your heating system isn't for drink or medical injection, so don't need to be crystal clean. Someone from a boiler manufacturer said dirty system...
  17. hertsboilers

    Changing analog to digital thermostat - help please

    Brown to A, and blue to B. Both of them are a switch, it doesn't matter
  18. hertsboilers

    Vaillant Turbomax VUW 242 1/E intermittent fault

    Is this boiler with a digital display? If yes what is the error code, F28?
  19. hertsboilers

    Swapping T40 for a Horstmann DRT2

    The thermostat is a switch.
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