System error E517H on truma system

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Hi David, We’ve found the solution thank you very much, regards, Gail

 Cheers mate..worked a treat

just to add to Davids informative post...

the unit will error if any of the power sources (LPG, 230v, 12v) os removed from the the unit prior to shutting down the unit at the CP Plus control panel.

try and get into the habit of turning the Combi OFF (press and hold control knob for 5 seconds or so) prior to disconnecting mains or turning off the gas.

even turning the vans control panel off (and removing 12v from the Combi) should be avoided.

I sometimes wonder if the brand name ‘Truma’ is a derivative of the word ‘Trauma’. I’ve had several problems with my Combi this year: intermittent fault with12v supply that nobody seems able to fix and connectivity problems between bluetooth devices, also seemingly without solution.

although my CP Plus model is "Inet ready" i dont have the extra module and therefore dont have any connectivity issues...

i had 6 years in two Swifts with pre CP Plus versions and only ever had one blown fuse and one reset (red button) needed...

since then, in the past 6 years in two German vans (same brand) ive had two CP Plus models and have never had a reset and just one error where i turned off the 12v before closing down the Combi.

i read on other forums where plenty of owners do have a Truma-tic time of things but im pretty convinced that poor installation (sometime totally ignoring Truma's instructions) and too much electronic integration (think 'Command/Harmony' type overarching systems) seems to me to be unnecessary and too complex.

my own view from over a dozen years of using Combis is that they are great units but need a little understanding (many dont understand how 'mix' fuel works) and a little respect (dont remove any power source prior to turning the unit OFF).

First 3 years experience of Combi with a professional installation was fine, everything worked fine and was reliable. Last year it all started to go south, connectivity problems with new iPhone 11 & SE products, eventually fixed but took a long while. They’ve just updated the App and same old problems are back! Also, Combi just cuts out when it feels like it and Truma service agents can’t find anything wrong with it! I no longer have confidence in the Combi and might junk the lot in preparation for a more reliable system for next winter! 

I can operate our Truma through my mobile phone quite easily and I updated the App this week with no issues.I stick to basic functions,being a simple bloke.The wall control baffles me and I have to call for my wife to help when it does unexpected things.Peering myopically at little black symbols on a grey background does not help me get to grips with the system;too clever by half for me.

The previous version in our 2009 built van was easy for me to use as it had physical  dials and things👍

My wife delights in fiddling with the intricacies of the Harmony System on our AS by setting timer, sending it SMS messages etcetera -much to my irritation.Not much fun having a cold shower because Pandora has been "opening the box of horrors" again and has broken what did not need fixing in the first place!

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I believe ours can if I pay for a module. It says iNet ready on it. However, I can’t really see any point. It’s just above the door in a convenient place to operate, we have just the one panel. Although I have turned of 240 volt before switching it off and not turned on the gas before requesting its use, so far the error codes have disappeared once the supply is provided. Not done the 12 volt yet, although our panel stays on even if the 12 volt to the rest of the van is turned off, so not sure if it would be an issue.🤞