Check the spa's control panel. Many spas have different modes to save energy. If a spa is not in its standard mode, the water may not heat properly.
Open the filter cartridge and clean the filter. Dirty filters often restrict water flow in the spa, negatively affecting the water heating process.
Bleed air from the pump and plumbing. Most spas have valves and other plumbing particulars that need to remain open and free from air. If these valves restrict water flow, the spa will often not heat properly.
Check the electrical connections to the spa. A simple diagnostic tool is to shut power off (at the breaker) to the spa and turn it back on. Also review connections to ensure no water comes in contact with them.
Test the heater and pump. This step should only be performed if the hot tub has GFCI protection. With the spa turned on and the access panel removed from the side of the hot tub, look at the main control center to see if there are any indicator lights on. If not, the control center may need replacing. Using a non-contact voltage tester, check the wires leading to the heater and pump to determine if they are energized. If not, the control center may need servicing. If the wires are energized, then that associated piece of equipment may need to be replaced.
Things You Will Need
- Non-contact voltage tester
- Placing a water thermometer into the spa can help you keep track of the water's temperature. You can compare this reading to the spa control's reading.
- When using a spa cover, make sure it fits properly and you place it square on the spa when not using the unit. This ensures the spa maintains optimal heat.