If the heat light on your PCU is flashing to indicate that the desired temperature has been reached but the displayed temperature is approximately down 2-3 degrees from the set temperature, this is completely normal.

- The unit is designed to heat to the set temperature, however the display may read 2-3 degrees from the actual water temperature in the basin

- This is to ensure the unit can remain at the set temperature, despite varying temperatures at different levels within the tub basin

- If the temperature is set to 102 degrees F, and the Red Heating light is blinking when the display reads 99 degrees F, yet the water in the basin is at 102 degrees F, the spa is doing its job.
- If the red heating light were solid, that means the heater is still trying to heat itself. 

The heater will reactivate on its own once the temperature has dropped 2-3 degrees from the set temperature.

It will then heat until it has reached the desired temperature once again.

However, if the unit goes into standby but you would like it to continue heating, simply press the heat button twice, once to turn it off, then again to resume heating.

The light would then become solid and continue heating to the set temperature.