Wocester bosch 550cdi

[kouroshi]

Hi we currently have a Worcester Bosch 550 CDI. I was having issues with it and had a plumber come out to have a look the pump was struggling so that was replaced. The boiler keeps going into a flashing mode where there is a E looking without the top line I have attached a video. The central heating will not heat during this time.
Can I add that the combi is a water on demand but if taking a long shower the water starts to get colder and colder until stopped and restarting the water. Does anyone know what’s going on? Really appreciate your replies. Want to get plumber out but due to covid and being vulnerable can’t.

 

[Aquarius]

The E without the top line becomes a lower case t, and it’s suggesting that the internal heat bank is active (hot water), so heating I presume will not fire up, I haven’t worked on any storage/high flow boilers.

 

[kouroshi]

storage/high flow boilers.

Hi firstly thanks for your reply, secondly you are correct as it is a lower case t and the manual states what u said about the heat bank. But does anyone know why this comes up every time I use the hot water and it won’t go away for 10-15min and during that time the heating won’t heat even though hot water is not being used. Also if someone takes a long shower the water starts getting colder and colder towards the end of the shower!

looking forward to your replies as this has a few plumbers confused who have already had a look at it. I have tried to get Worcester Bosch to come out but they won’t due to covid.