armstrongpiper Posted August 29, 2016 Share Posted August 29, 2016 The Truma Combi in our PVC is 18 months old, and while performing well enough, it has given cause for concern several times, so that we don't entirely trust it to always work on demand. It has blown a fuse once, for no apparent reason. It occasionally stops working, and the fault signal given indicates an overheat condition. On cooling, the boiler starts working again, without having to press the reset button. I will have to consult a Truma expert at our local Dealer, but I wondered if anyone out there has had similar problems. Neil B Link to comment Share on other sites More sharing options...
Derek Uzzell Posted August 30, 2016 Share Posted August 30, 2016 I believe you own an IH 600S motorhome anf that your Truma heater is one of the “Combi(E)” variants. http://forums.outandaboutlive.co.uk/forums/Motorhomes/Motorhome-Matters/Truma-4e-heater/38297/ I guess it’s worth saying that the reset button relates only to a Combi(E)’s 230V heating capability. The button’s function and usage is described on Page 17 of this documnt https://www.truma.com/downloadcenter/combi_e_cp_plus_ready_operating_de_gb_fr_it_nl_dk_se.pdf If your heater is actually overheating while operating on gas (or just producing a spurious overheating fault-warning while operating on gas) the 230V-related reset button should remain ‘pressed in’ and attempting to overcome the problem by pressing the button won’t have any effect. Truma “Combi” heaters differ radically fron their C-Series predecessors, not just in their design and construction but also in the ‘logic’ of their operation. While a C-Series heater was (fairly) tolerant of an installation that significantly failed to meet Truma’s recommendations, a “Combi” is likely to be much fussier. If your heater is seriously ‘boxed in’ and/or its enclosure is not well ventilated and/or you are shutting off critical air-outlets using their ‘butterfly flaps’ to control the flow of hot air, the heater may well overheat and protect itself by shutting down temporarily. So the installation needs looking at and - if that seems OK - you need to decide whether you may be provoking the overheating yourself. Unless it happens again and a diagnosis can be made at the time, you may have to accept the fuse-failure as a one-off. Might be wise to keep a spare fuse just in case... Link to comment Share on other sites More sharing options...
armstrongpiper Posted August 30, 2016 Author Share Posted August 30, 2016 Thankyou for your reply, Derek. The document referred to in the link is the instruction manual supplied with the unit, and I admit I haven't looked at it since day 2 of ownership! However, I'm not sure it explains why we have the occasional 'overheating' event. As this doesn't occur on every usage occasion, I have to think the installation is OK, and there is little that could be done to change it anyway! On the idea of having a butterfly vent closed, this is something we do do, to avoid the toilet compartment getting uncomfortably warm, so this is to be considered afresh. Thanks again, Neil B Link to comment Share on other sites More sharing options...
Derek Uzzell Posted August 31, 2016 Share Posted August 31, 2016 Truma’s installation instructions for current-model “Combi” heaters can be viewed here. https://www.truma.com/downloadcenter/combi_e_cp_plus_ready_installation_de_gb_fr_it_nl_dk_se.pdf The relevant advice on warm-air distribution is on Page 15. Whether your closing off the toilet compartment air-outlet might result in overheating would depend on how the heater has been installed, but (logically) the higher the quantity of cool air that can pass through the heater the lower the risk of overheating. I ‘re-trunked’ the Truma C-Series heater in my previous Hobby motorhome (as it was the only way to side-step a construction fault) and I’ve modified my Rapido 640’s warm-air trunking for its “Combi” heater so that there’s a sporting chance it will work as Truma intended. My experience is that few motorhome installations of Truma combination air/water heaters closely follow Truma’s guidance, and some installations are downright diabolical. I’m guessing that you have A “CP Plus” control-panel https://www.truma.com/downloadcenter/cp_plus_installation_operating_de_gb_fr_it.pdf rather than the older ‘dial’ type https://www.truma.com/downloadcenter/cp_classic_installation_operating_de_gb_fr_it.pdf but either way, if your heater is stopping working every now and again for no apparent reason and a fault-code is being produced, that code should provide a clue to the cause of the problem if the problem is user-rectifiable. Plainly, if there’s a genuine technical problem with your heater that’s causing it to overheat, or the heater’s electronics ‘think’ it is overheating when it is not, the fault-code won’t necessarily provide a valid answer. Truma appliances have a 24-months warranty, so you’d be wise not to delay consulting your local dealer about the mysterious stopping and restarting. Link to comment Share on other sites More sharing options...
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