I have just reserected a old hot tub I bought off craigs list. New gaskets all around and pump seals. Everything works fine and the main pumps comes on with the heater to keep temp up. Problem is with the thermostate cranked all the way it maintains 102 degrees. I live in western NY and winter is coming and was wondering if the thermostate might be bad causing me not to be able to achive higher temps. Any ideas? I think from the jets it is a Hydro Air hot tub.