So, I've also had the problem with the heater failing after having used heat immediately. I have previously used this with no problem, using the default time setting of 30 mins. Ran for 30 mins, shut off. Heater still worked. Then on Monday, it was -9C. Van was covered in snow, so I thought it would take a bit longer to warm up! So I set the time to 120mins, ran on heat immediately, and sure enough after 2 hrs it shut off. Van was lovely and warm, but in the end I did not take the van out. On Tuesday, I tried heat immediately from the remote, and it would not start heating. Would also not work on heat continously mode. I got the 'please wait' message repeatedly, but it was intermittent, so when it briefly went away I tried hitting the 'settings' button (with ignition on). I got this message:
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Battery was good, fuel 50%, but just to check I put the fridge on - it started no problem.
So then I took it for a drive. On return everything was back to normal - heater started no problem.
This is clearly a software fault. I wonder if it is somehow related to using heat immediately at max runtime - i.e. 120mins. There was no problem using 30 mins. I have never used anything in between 30 and 120 mins - I will try a test running for 90mins to see if either a) there is no problem or b) it fails again. At least I know the fix now.