Acrylica whirlpool question

Hi all, We bought a house with an Acrylica brand whirlpool tub. I think its about 6 years old but I don't have a model number. It has 6 jets and a small round "control panel" mounted in the deck around the tub. The "control panel" has one button, On/Off. When pressed the jets start and the digital display on the panel shows 10. This is obviously minutes, the display them alternates between time left to a number the looks like 88 with a degree sign. Could this be the water temp? It does change, I've seen 87 and 89.
My big question is it possible to change the temp, or time? There is only one button, ON/OFF. Anyone know of a manual online?
Thanks, Jeff
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Jeff Guay wrote:

Hi, If there is no built-in heater, adjusting temp. is out of question I guess. Our Jaccuzi in the bath room has timer and jet adjusting knob. This by way of venting makes the water jet strong or gentle.
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