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CAUTION: Electrical repairs can be dangerous, especially around water. We recommend that repairs be referred to a qualified electrician or spa technician. Regardless of who performs the work, make certain that all electrical power to the hot tub or spa is disconnected prior to making any inspections or repairs. The information  provided here is for educational purposes only.

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Spa repairs High-limit trips erratically; trips at end of heat cycle.

Components associated:

  • High-limit Switch
  • Filter Cartridge
  • Pump
  • Heater element

A) If high-limit switch trips within a few minutes of heater activation, a water flow restriction may be the problem. Check your filter(s). If flow is normal with filter removed, then clean filter cartridge, or replace if more than 1 year old. If flow is still low, proceed to 2).

B) With the power to the spa disconnected, remove the suction end pipe of pump (wet end). Inspect inside for debris which has obstructed any area of the impeller; remove debris. Check for damaged impeller. If damaged, replace.

C) With power to the spa disconnected, check to verify heater element is not touching the sides of the heater manifold.  If touching, carefully move element away from manifold with long screwdriver.

D) If all above check good, replace high-limit switch.

Note: High-limit tripping at the end of heating cycle is often a result of the residual heat from the element causing the water temperature at the sensor to rise for a few seconds. This will sometimes trip an aging high-limit switch. Replace high-limit. (We do not recommend attempting to adjust or recalibrate high-limit switches).


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