Heat Siphon won't start

Just opened the pool last week, got the water balanced, turned on my SWG, and then went to turn on my Heat Siphon heat pump and it wouldn't start. I got it last year and it worked great all last summer. I called the company and the woman told me it's most likely either electrical connection or water flow. All the circuits are on, so I assume it must be insufficient flow? The pressure gauge on my DE filter tank is currently reading 12, which is pretty normal. Figuring that maybe it was a little high, I backflushed and added new DE and the reading went down to 10psi, but the heater still wouldn't kick on.

The next step is a service call, unless someone on here has something else I could try. Again, the heat pump is only one year old and worked great all of last summer. Thanks!
 
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