Sometimes if there's a difference, it has to do with where in the hot tub the monitor is floating, compared to where your sensor is, as hot water rises. This is especially true when the jets are off. We recommend that you run the jets to see if the temperature equalizes between the two sensors.
Hot Tub Problems
Foam can and will develop in perfectly balanced hot tubs. If it has been more than three months since you have drained your tub, you may consider draining and rebalancing at this time. Another alternative, is to purchase hot tub defoamer. It works instantly! Sources of white foaming may include (but are not limited to) […]