PhilDK replied on 15/04/2023 18:17
Posted on 15/04/2023 18:17
Hello,
I just noticed that I get the W407H warning on my CP+ panel for my for my Truma combi boiler.
Researching this on the web indicated that this happens when the 240V supply feeding the caravan is disconnected when the source for the boiler is on electric.
In my case the 240V supply feed was connected and running in the caravan but I noticed that if I turn the heating/hot water off, after heating the boiler, on the caravan power panel under the seat then the warning is displayed. If I turn the heating/hot water on the power panel the the warning clears.
Is this normal or have I a problem with the system.
Thanks you for any guidance.
Phil.
PhilDK
Caravanner from Hampshire