Appliance Repair Questions? Ask a Technician for Answers ASAP
nothing wrong with the answer quality
engineers have attended the machine and told you to add a hot water bottle, that's increasing the load
if you had been willing to try the suggestions then I would have advised further on the bedding issue.
I'll opt out of the question as you aren't prepared to accept the advice is correct, even though I work on these day in day out and know how they actually work.