When your system is put into Spa mode the system draws water from the spa only to the heater to keep the spa at temp, this is why the overflow doesn't work and why you can not heat the pool in spa mode. If you could heat the pool this way it would take a very long time, since the spa is smaller then the pool. You can heat the pool and spa at the same time in pool mode. Water is pulled from the pool, heated and goes back into the pool and spa.
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