On Fri, 17 Jul 2015 15:28:40 +0100 Mark Rogers mark@more-solutions.co.uk wrote:
Background: A couple of times I've had my garage freezer defrost. I'm pretty sure it's not failed, just that the door isn't properly shut, so I want to find a simple way to monitor it. I already have some basic wireless energy monitors and I figure a reduction in average usage (eg it failed) or an increase (door open) would be a good place to start.
Surely you're monitoring the effect rather than the cause. If the cause is that the door is left open, monitor the door! It would also be much simpler to do.