crob Posted February 8, 2017 Share Posted February 8, 2017 I have a Hymer with underfloor heating. It works on 240v or gas, or both. Until this winter it has been fine - van warm as toast after a few hours. But now it is hardly working. After getting warm, after 3-4 hours it goes cold again. The pump still works, the heating fluid is half way up the inspection window ( the correct level), there are no visible signs of kinks in the flexible pipes. I have tried using it on gas and electric, both individually and together, but it makes no difference. Anyone got any ideas, please? Thanks for your anticipated replies. Link to comment Share on other sites More sharing options...
StuartO Posted February 8, 2017 Share Posted February 8, 2017 Have you had a habitation service recently? If not that should include a functional test and the skilled technician might know what's wrong and fix it. Link to comment Share on other sites More sharing options...
crob Posted February 8, 2017 Author Share Posted February 8, 2017 No not for a while. If I can't fix it, that's what I shall need to do. Link to comment Share on other sites More sharing options...
thebishbus Posted February 8, 2017 Share Posted February 8, 2017 As it is affects both gas and electric. I would suspect the temperature control system , thermostat maybe? Brian B. Link to comment Share on other sites More sharing options...
crob Posted February 8, 2017 Author Share Posted February 8, 2017 Thanks. The stat seems to be working. The pump goes off when I turn the stat down, and switches on again when I turn it up. Link to comment Share on other sites More sharing options...
thebishbus Posted February 9, 2017 Share Posted February 9, 2017 If the room stat only turns the pump on and off, I would think there must be another heat on off selector to stop the system from over heating when the pump is off. This maybe temperature , flow or pressure operated . Needs someone with a circuit diagram to have a look see. Brian B. Link to comment Share on other sites More sharing options...
thebishbus Posted February 11, 2017 Share Posted February 11, 2017 Hello again. If yours is an Aide 3010 compact system, you can download a manual for it. Brian B. Link to comment Share on other sites More sharing options...
crob Posted February 11, 2017 Author Share Posted February 11, 2017 Thanks. It's a Truman. I'm going to check the fluid level again, in case I misread it. Link to comment Share on other sites More sharing options...
thebishbus Posted February 11, 2017 Share Posted February 11, 2017 OK That's probably a Truma Aquatherm. Manuals are available . Brian B. Link to comment Share on other sites More sharing options...
Derek Uzzell Posted February 12, 2017 Share Posted February 12, 2017 Manuals for the Truma “Aquatherm” system can be found here https://dealernew.truma.com/_anweisungen/Truma_Katalog/2%20gb/aquatherm_gb/aquatherm_de.html It looks like production ceased in late-2005, so Aquatherm-related technical expertise may well be be in short supply in the UK nowadays. There is little trouble-shooting guidance in the operating instructions, though the following advice may be relevant “The system switching off again after a short period of operation may indicate that there is air in the hot water system. In this case the system must be bled (see Maintenance).” I also note that, to prortect against corrosion, the glycol/water ‘heating liquid’ should be replaced every two years or so. Link to comment Share on other sites More sharing options...
crob Posted February 12, 2017 Author Share Posted February 12, 2017 What a plonker!!! I checked the fluid level whilst the system was running. I'd forgotten about the holding tank with a min/max level and to check it whilst not running. So I took the front off, topped it up with fluid, undid the bleed valves, and hey presto, we're back in business again. It's an age thing - you forget the basics sometimes. Thanks for your comments. Link to comment Share on other sites More sharing options...
thebishbus Posted February 13, 2017 Share Posted February 13, 2017 Good result, but it maybe worth checking the system for a leak . Brian B. Link to comment Share on other sites More sharing options...
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