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  1. M

    Bosch Worcester Highflow 400 keeps failing - help!

    BG called out Worcester so their engineer arrived ealier. Running the bath tap for enough time to fill the bath compeltely, let alone enough for 2 small children, didn't trip the boiler - oh joy, a random fault?! He has turned down the hot water gas burner (?) by 2 millibars as it was on full...
  2. M

    Bosch Worcester Highflow 400 keeps failing - help!

    Latest update...everything worked ok from Friday fter the visit by the BG engineer and Worcester engineer. They changed the dhw heat exchanger, the cutout switch and something else, cleaned various bits up and everything seemed to run fine so off they went. And indeed everything has been fine...
  3. M

    Bosch Worcester Highflow 400 keeps failing - help!

    latest update...waiting for worcester engineer to arrive but in the meantime Graham, my lovely BG engineer, has arrived to replace the dhw heat exchanger. At least one of the pipes connecting this to something is compelely gunked up so worth changing I presume. Thank heavens I'm not working at...
  4. M

    Bosch Worcester Highflow 400 keeps failing - help!

    Thanks for all the advice. The latest is that the fan has been replaced, along with the primary cutout switch (wasn't responding) and the circuit board. British Gas spoke to Worcester who thought that at least the fan problem might be a faulty circuit board so here we are. Currently I have...
  5. M

    Bosch Worcester Highflow 400 keeps failing - help!

    I know that they have definitely changed the main heat exchanger (according to the worksheets I have), not sure about the secondary one bu I will definitely suggest it. Keep those helpful ideas coming please.
  6. M

    Bosch Worcester Highflow 400 keeps failing - help!

    Please don't think I'm having a dig at BG engineers. I think it is probably quite tiresome to try to diagnose a fault that may have had several people fiddling around over a series of visits. And I'm very grateful for any advice or ideas which we can put forward. It's just that the current chap...
  7. M

    Bosch Worcester Highflow 400 keeps failing - help!

    We're getting fed up with a series of boiler problems which so far British Gas have been unable to solve. Jan 01: heating/hot water had failed. BG engineer reset overheat cutout switch and repressurised the boiler (it had gone low). Jan 02: boiler overheat cutout switch had tripped several...
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