My Ultratemp had been working just fine upon opening of the pool, but I didn't notice it running this last week. We hadn't been in the pool, so no big deal. When I opened the cover on Sunday to swim with my son, the water was nowhere near the 86 degree setting on the heat pump. I toggled to Spa mode and the heat pump fired right up. I toggled back to Pool mode and noticed that the Act temp displayed showed 95 degrees. I'm wondering if I've got a bad thermostat on the heat pump. Any ideas? Thanks.