A digital spa pack may not have a manual high-temperature reset switch. This is controlled by a sensor instead. If the heater element is not getting the proper amount of water flow due to pump problems or poor water level, the sensor will trip the heater and cause it to stop operating. Check the spa's water flow for pump operation. Make sure the spa water is at the proper fill level.
Never try to operate a heater if the spa is not at its proper fill level. Doing so can cause the pump to lose prime and the heater element to burn up.
A spa or hot tub provides a form of personal relaxation known as hydrotherapy. The spa's pump and heater provide a soothing environment by circulating water through jets and increasing it to the bather's desired temperature. A spa heater may need to be reset if it has tripped or stopped working. Using the high-limit reset switch and checking all breakers and GFCI outlets can reactivate the spa's heater.
Locate the spa's high-limit reset. This is a red button found on many spa packs. It may be located on the heater and covered by a rubber nipple.
Press the high-limit reset button. When this button is tripped, it will "click" in when you reset it.
Turn on your spa and observe its operation. If you do not have power to the spa, you may have a tripped breaker panel switch or GFCI outlet.
Flip the breaker panel switch on or press the reset button on the GFCI outlet to restore power. Turn the spa on. If the spa trips or stops working the second that heat demand is present, the heater element is probably the cause. You will need to replace the heater element.
Based in Florida, Jim Franklin started writing professionally in 2009. His articles appear on websites such as eHow, where he covers topics ranging from home improvement to finance. Franklin has a Bachelor of Arts in business management from Florida Atlantic University.