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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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