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I’m new to Caravan Talk and this is my second post, the first one being to say “Hi Guys” on the “hello” forum. The following experiences occurred prior to me finding this website via a google search on Alde Overheat problems, and prior to me reading every Alde-related post on this very informative Caravan Heating forum. My wife and I have caravanned since 1972 and this is our first encounter with the Alde heating system. I thought that I’d relate my experience since, though a couple of others mentioned the same problem in passing on other threads, there was no specific discussion of why it occurred and how to prevent it recurring. If any of the Alde technical staff read this, I’d appreciate them popping in with comprehensive advice. We took delivery of our new 2015 model Lunar Clubman SB in Nov 2014, successfully tested the Alde system on our house driveway, and then set off for a few days. The first day and evening the system worked fine. In the middle of the second evening, the system stopped with an “Overheat Red Fail” warning. The Alde Control Panel 3020 013 Operating and Installation Instructions says to reset by disconnecting and reconnecting the 12V supply from the boiler, but nothing else. The Lunar manual doesn’t even mention fault codes. I switched off the Alde system, and after a cold night, I switched it back on and tried re-starting the heater the next morning. It fired up OK, subsequently working with no problem for the remaining two days. On returning home the caravan went into secure storage with everything switched off. Fast forward to last Saturday afternoon the 3rd of May, and I fired up the Alde on our house driveway to get it working before we were to set off the following Monday (today) on only our second foray with this caravan. The outside temperature was 12degC, and I set the system on 3kW electric aiming for 24degC final temp. Then I went to start collecting paraphernalia for the trip. However, on returning later to the caravan I found that when the internal temp had reached 15degC, the Overheat Red Fail warning had activated. I shut down the 12V supply, switched back on, and the warning persisted. So I switched off the heating system. Three hours later, having let the system cool down, I reset the system to the default 22degC and tried again, this time on gas only, thinking that if it got up to 22degC I’d switch over to 1kW electric to see if that was OK. It fired up again, but shortly afterwards with the temp reading 16degC, the system Overheat Red Failed again. Rain was beating on the caravan roof, and my day didn’t seem to be getting any better. It was some time after this that I noticed a blue stain on the carpet adjacent to the shoe locker beneath the wardrobe where the header tank and pump are located. On opening the wardrobe door the walls and base were splattered all over with blue Alde fluid. A couple of the drawers had droplets of antifreeze inside, and the shoe locker was flooded, with fluid seeping out onto the carpet. What apparently happened is that the system really overheated this time and blew a header tankful of fluid out into the wardrobe space. Luckily we hadn’t yet packed the wardrobe, drawers or shoe locker, so no clothes were damaged. The carpet was quickly held under a running tap until all the antifreeze was purged from it. It took me all evening and most of the next morning to fully clean up the mess with several cloths and buckets of hot water, and I now wish that I’d taken a photo beforehand showing what had happened. In other threads people have complained that their wardrobes and clothes smell of antifreeze, so I’m wondering if their caravans may have suffered this system failure prior to their ownership. Some of the fluid will have disappeared down a 1/4in gap between the plastic wheel arch moulding and adjacent floor panels, so I hope that no floor rot is setting in. I now suspect that after every Overheat Red Fail warning, careful bleeding and topping up to the required level with antifreeze mixture may well be essential to clear air locks. So the tyro Alde system owner could do with owning a bottle of antifreeze mixture from day one. The circulation pump still works and is loud in the absence of fluid in the header tank, so clearly it hadn’t been seized before the event. Both Alde and my caravan dealer’s technical dept are closed for the bank holiday so neither could be contacted for immediate advice. I’ve emailed Alde with the foregoing details, and will visit our dealer tomorrow to make an appointment to have the system examined and fixed. Gordon