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Thanks for your comment, the pressure drop from 3.2 bar to 2.8 bar when drain the radiator, then it appears error of F75(water shortage), I need to open fill loop valve to turn on boiler. Then just keep the same phenomenon.

When turn on Vaillant ecoTEC plus, bar symbol flashing from time to time, indicate filling pressure outside permitted range(around 3.1bar), when flashing the burner turn on as well. I've tried to drained radiator to lower pressure but doesn't work. Advice are highly appreciated.

Thanks, could you advise any solution?

Pls refer to images as attached.

Hi, I've found many peeling off on my shed flat roof, not sure is made of pitch or not?(get immediate warmer when there is sunshine), alread caused leakage when there is rain. Can someone advise how to settle the issue. Pls refer to images as attached. Thanks in advance! Eric

I am not sure, pls refer to the photo

Hi, I climbed on the loft recently and mistaken stepped on wooden surface instead of beam, and therefore result in some damage, can anyone give professional comment? Thanks in advance!

Hi Mate, I already got new seal and grease in hand, how long need to put grease around the seal,before reinstall back?

Thanks Mate!(I don't know your name) You really help me a lot！

Thanks Mate! I already got O ring seal out and found some wearout on it, shall purchase new one to replace.

Thanks Mate, I am still strugling to get rubber seal out, its on back side of rail......

Not yet, which kind of grease, the seal is on the back of rail, very difficult to take out

Hi, today I removed plate heat exvhanger and washed, but when I assemble plate heat exchanger back, there is always powerful water leak form right part(exchanger), even I think screw is secured, any comment about the reason? Thanks in advance!

Thanks Mate, yes I found them on rail assembly, now another issue, when I assemble plate heat exchanger back, there is always water leak form right part(exchanger), even I think screw is secured, any comment?

Hi, I found the instruction of remove plate heat exchanger says to remove 4 rubber seals, but don't find any, can somebody if I can wash and assemble plate heat exchanger without rubber sea? Thanks in advance!

Thanks Mate!

Thanks Chris, I reckon block in heat exchanger might be the most probable reason, now checking how to replace or flush, really appreciate your professional comment!

Hi Chris, For hot water, the cycle betweem on and off is frequenty around every 15 seconds, temperature between 80-95 degrees centigrade. While when heating it keep on for several minutes then off. The model is Baxi Duo-tec Combi 40 HE Thanks Eric

Hi Chris W, This happens when running water, no matter on its own or together with heating. In fact when I turn on heating together with hot water, the heating doesn't work until I turn off hot water. But then burner keep on. Many thanks! Eric

I have a Baxi Combi Boiler. The issue is that the boiler turns on and off automatically in a period of every 5-10 seconds. The flame goes off and water starts to be cold, then it's turns on again and the water is warm(normally when temperature drop to 80 degrees centigrade it turns on). It's...