1. Spa Controls
2. Spa Pumps
3. Spa Packs
4. Top Sides & Wifi
5. Circulating Pump
6. Pool Pumps
7. Spa Blowers
8. UV Sanitizer
9. Ozonator
10. Chlorine/Ozone
11. Spa Heaters
12. Balboa Heaters
13. Any Size Pumps
14. Airbleeder
15. Pump Motors
16. Wet Ends & Volutes
17. Blower Motors
18. Boards & Sensors
19. Electrical Components
20. Plumbing Components
21. Air Buttons
22. Management
23. Baptismal Products
24. Spa Lights
25. Universal Spa Motors
26. Spa Massagers
27. Portable Hot Tubs
28. Filters & Testers
29. General Part List
30. Product Information
31. Manuals & Guides
32. Wiring Diagrams
33. Troubleshooting
34. Terms & Conditions
35. Limited Warranty
36. Returns, Repairs & Warranty Claim Form
37. Proper Water Chemistry
38. Watkins Heaters
39. Watkins Pumps
40. Resale Info

Spa and Hot Tub Troubleshooting


Tools needed to troubleshoot your spa:

  1. Calibrated thermometer
  2. Good Amp Meter
  3. Good Ohm Meter

Problem (1): The temperature displayed on the topside controller doesn't match spa water temperature measured by a separate calibrated thermometer.
Make sure the pump that circulates water through the heater is 'ON' for at least 10 minutes before you compare temperatures between our controller's Temperature Sensor and your thermometer.

General Information About How Spas Are Made
All hot tubs by design must be equipped with two temperature sensor circuits. One is called a Hi Limit Sensor (HLM) and the second one is the Temperature Sensor (SENS). The Hi Limit circuit is designed to shut power 'OFF' through the open Neutral relay if the temperature where the Hi Limit Sensor is located exceeds 112°F (44.4°C). The Temperature Sensor (SENS) senses and displays the spa water temperature at the location where the sensor is inserted. It also allows the consumer to set the desired water temperature from 45°F (7.2°C) to 104°F (40°C). On most spa controls, the Hi Limit Sensor and the Temperature Sensor are located on the heater manifold. However, some spas have their Temperature Sensor located on the spa shell and the Hi Limit Sensor located on the heater manifold. When comparing the displayed temperature to your thermometer you must take the temperature reading from your thermometer near where the Temperature Sensor is located on your spa otherwise the comparison may not be accurate.

If the Temp and Hi Limit Sensors are located on the heater manifold:
The heater manifold is located inside the spa cabinet. If the sensors are located at the heater manifold, the Temperature Sensor senses the water temperature inside the heater manifold (near the heater element), displays the temperature it senses on the top display, and commands the heater circuitry accordingly. In many spa applications especially during winter, the temperature inside the spa cabinet where the control and heater are located will be different (usually lower) than the water temperature inside the hot tub. When the pump is not circulating water through the heater manifold, the temperature of the water volume inside the heater manifold (approximately 0.3 gallons [1.2 liters]) may drop a lot faster than the temperature of the water volume inside the hot tub (200+ gallons [750+ liters]). In addition, the back of the spa shell is insulated with several inches of foam, but the spa cabinet itself may not be insulated (or poorly insulated). Cold air penetrates through the spa cabinet and lowers the temperature of the pipes including the heater manifold where the sensors are located. The Temperature Sensor will display the temperature it is sensing in the heater manifold. If the pump is 'OFF' and not circulating water through the heater housing the temperature inside the heater housing will continue to drop quickly. Once the temperature drops 15 to 20 degrees below the desired temperature setting, the freeze guard circuitry will energize the low pump circuitry continuously.

To check the temperature accuracy:

  1. Turn the circulating pump 'ON' for 15 minutes (to circulate water through the heater manifold).
  2. Using a separate, properly calibrated thermometer, measure the temperature at the heater manifold and compare it to the display.
  1. If the measured temperature is within +/-9°F (5°C) of the displayed temperature.
    Solution A: Use the calibration 'CALB' procedure on our controller and calibrate the Temperature sensor to match your thermometer.
  2. If the measured temperature is >18°F (10°C) of the displayed temperature.
    Solution B1: Try to better insulate your spa cabinet.
    Solution B2: Change the location of the Temperature Sensor to be inside the spa shell (you risk losing freeze protection at the heater manifold).
    Solution B3: You may need to change the Temperature Sensor, or very rarely, the PC Board.

The opposite can occur during summer time if the spa cabinet is not well ventilated.

For a printable version please click here! (Adobe Reader required)
Displayed Temperatures Don't Match



Problem (2): Do to improper electrical installation of the GFCI, the GFCI is tripping.
After installing a new GFCI, the GFCI is tripping. Check the wiring in and out of the GFCI as shown below.

A common mistake when installing a GFCI is wiring it backwards. The input side of a GFCI is the 'LINE' side. The output side is the 'LOAD' side. When wiring a GFCI in, the L1, L2 and N (if you have Neutral) coming from your electrical panel MUST connect to the 'LINE' side of the GFCI. Then connect from the 'LOAD' side of the GFCI to the spa control terminal block.

Another common mistake installing a GFCI is not connecting the Neutral (when you have Neutral) through the GFCI along with L1 and L2.

For a printable version please click here! (Adobe Reader required)
New GFCI Tripping...



Our dedication to cost reduction in manufacturing has resulted in the most competitive trade pricing offered anywhere. With advanced product innovation, unsurpassed product quality and unparalleled service, we hope to be your best supplier. When ordering on line please complete an order form with proper model number(s) so we can produce your product accordingly. When buying our products, you are doing business with a knowledgeable, professional and reliable company.

If you need technical assistance call us at 951-684-6667 or E-mail your questions to questions@acuraspa.com and our experts will assist you with your questions.



CE Logo


**Beating competitor's price: We will meet or beat any competitor's written quotation for hardware of the same capability, such as: plumbing size, voltage, motor horsepower, motor 1 or 2-speed, heater length, safety test report, etc.

A $7 Handling charge is applied to all orders.

All products sold per our "Terms and Conditions" found in the "Support" section of our menu.

When your order is produced, the pump motor used (A.O. Smith, Regal Beloit, Marathon Electric, etc.) will be whatever is in stock in our factory at the time.