Hello, I want to ask this question please. I’ve a HYMER Swing 544 2002. The water is draining from both sinks out through a pipe under the washroom instead of via the grey waste pipe. After much reading I gather it’s connected with a frost protection device on my Truma B10 boiler. The EHU was disconnected a few weeks ago and then this began happening. I’m totally at a loss to find this device. I know all about , just can’t find it on my vehicle.