GC 680 Truma heater going off

[DonGraham]

During this super cold spell I've left the van on hook up and heater set to 5°C to keep the chill off. But, I have noticed the heating seems to decide to switch off for no apparent reason. I've also noticed this happening when using the van on our travels, the heating just goes off, no error codes and can be switched on again.
I have heard that this is an issue and seems to be a conflict between the washroom display panel and the Truma panel under the seat.
I have the van booked in at the VW stealer for a number of issues in February, so does anyone know if this is an issue that they can fix? Software update perhaps?
Any advice appreciated!

 

[Mr T]

During this super cold spell I've left the van on hook up and heater set to 5°C to keep the chill off. But, I have noticed the heating seems to decide to switch off for no apparent reason. I've also noticed this happening when using the van on our travels, the heating just goes off, no error codes and can be switched on again.
I have heard that this is an issue and seems to be a conflict between the washroom display panel and the Truma panel under the seat.
I have the van booked in at the VW stealer for a number of issues in February, so does anyone know if this is an issue that they can fix? Software update perhaps?
Any advice appreciated!

Not aware there is a fix for this yet. The advice is to unplug the comms cable at the rear of the Truma panel. This stops the heating going off but means you have to control it from the Truma panel not the wall mounted one.
Certainly worth mentioning to your dealership when you’re in there so it’s noted.

 

[Mr T]

Unplug the lower one as per arrowed pic.

 

[DonGraham]

Thanks for that! I'll add it to the list when it goes in and see what they say!

 

[reimajarvinen]

I have had the same problem for couple of years and no fix from VW for me.
I have noticed the following when it happens.
- Truma stops.
- When opening the control panel there is an error message " Battery Low " for about 0,5 s .
- Control panel battery has been always green and above 12.2 volts. I have also verified that with multimeter from leisure battery connectors.
- When I restart Truma it works fine.

Has anyone got an fix from VW ?

 

[Henk Vandecasteele]

We have a 2021 gc600. It has this "heating stops out of the blue" problem as well. It went for VW recall in spring 2024 for fixing the electric step and a leak on the top brake light. But no fix for the heating switch off issue, ... . Just unplugged the ci bus connector, as we are heading north to Scotland, ... .

Henk

 

[Tstranne]

We have a 2020 GC600 with exactly the same problem. My nearest dealer has no clue and want me to leave the car for a faulttracing costing me roughy €200, which I won’t do of course, as they don’t have any solution in the end anyway.

 

[G-A-R-Y]

Mine did it last night. Left it on15c. This morning it was off.
I was not on hook up. 13.2v battery.

 

[markicp]

Same here 2019 GC680 it has been like that since new and no fix, sad but we just put up with it.

 

[Tstranne]

I read in a german community that there is a new software update (V0110) which might solve this disconnection issue!? Anyone heard about this?

 

[Mr T]

I read in a german community that there is a new software update (V0110) which might solve this disconnection issue!? Anyone heard about this?

Yes I’ve read that too. Let’s hope so, it’s not a big issue, but an annoying one when it occasionally happens.

 

[Pwee]

I assume no progress on this problem since the last post. My wife and are on our second outing in our GC 600 and it looks like we have this issue too. We had one successful night with the heating and water on electric hook up until the morning when it had gone off. I wondered if the hook up was not providing enough to keep the battery going. The following evening I decided to try diesel but with no joy. I tried to revert to electric but the control panel refused to retain any changes. I could select electric and a temperature setting but on returning to temperature controls it had reset to diesel and heating only. Any change of heating temperature also returned to the previous setting. I cannot change any temperature settings other than heating only at 18 degrees using diesel. I wondered if resetting the control panel by switching off the power master switch would help or should I go to the Truma control panel under the bench seat and disconnect the lead as the suggestions above? Can rebooting cause other issues? Is it the wrong approach anyway?

 

[Mr T]

I assume no progress on this problem since the last post. My wife and are on our second outing in our GC 600 and it looks like we have this issue too. We had one successful night with the heating and water on electric hook up until the morning when it had gone off. I wondered if the hook up was not providing enough to keep the battery going. The following evening I decided to try diesel but with no joy. I tried to revert to electric but the control panel refused to retain any changes. I could select electric and a temperature setting but on returning to temperature controls it had reset to diesel and heating only. Any change of heating temperature also returned to the previous setting. I cannot change any temperature settings other than heating only at 18 degrees using diesel. I wondered if resetting the control panel by switching off the power master switch would help or should I go to the Truma control panel under the bench seat and disconnect the lead as the suggestions above? Can rebooting cause other issues? Is it the wrong approach anyway?

There is a TPI to fix this now. Get booked in with your VW dealer and ask for the software to be updated to fix this issue. (By this issue I mean the heating/hot water going off randomly).

 

[Pwee]

Thank you for this Chris. I’ll do just that. Is that something that can be done remotely? Still away and I guess a few more cold nights to come. To be fair the dog has the worst of it!

 

[Mr T]

Thank you for this Chris. I’ll do just that. Is that something that can be done remotely? Still away and I guess a few more cold nights to come. To be fair the dog has the worst of it!

No it’s a visit to the dealer I’m afraid. They need to iodate the software via an sd card. No remote option.
If you’re heating keeps cutting out over night you can disconnect the cable from the back of the Truma control panel that links it to the main control screen in the wet room wall. This will mean you can 8n,y control the heating from the Truma panel but should stop it cutting out.
Disconnect the cable as per this photo:

 

[Pwee]

I do that also Chris. I have seen that option above. It would be good to employ while away as you say, thank again.