Last thing, but doubtful. If the Leisure batteries are low on voltage it will also fail to start or cutoff.
Finally, make sure you go to a Westy dealer that has experience with these heaters. I had a real struggle finding one capable in Switzerland. Finally my mechanic and I just decided to rebuild it ourselves and learned a lot in the process! Let me know if I can help further. The bleeder valves are in a totally stupid place for example. Under the plastic next to the bench seat in the front “basket” part. We ended up cutting a small hole so we can always access the bleeder valve quickly if needed and cover it with foam tape otherwise.
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