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8.11 Troubleshooting A Thermal Pump Cutout
1. Verify that the voltage to the hot tub is 240 VAC (120 or 240 VAC for J-315) ±10%. An in-
sufficient voltage supply can cause the motor to pull too much current and to overheat. This
situation must be corrected.
2. Check the voltage to the hot tub. Remember, the power company is required by law to pro-
vide the correct voltage to the customer. They will come out and check suspected problems (in most cases,
free of charge).
3. If the voltage is OK, examine the environment in which the hot tub is installed. Hot sun, hot weather, and
the lack of a breeze can cause heat buildup in the equipment bay in addition to the normal heat produced
by the pump. This can raise the temperature high enough to cause the thermal cutout to trip. There are two
possible solutions to thermal cutout problems which are not due to low line voltage. One is to change the
filter cycle periods so that they do not coincide with the hottest time of the day and peak power consumption
hours. Another is to ventilate the equipment bay. Call Jacuzzi Hot Tubs Technical Support for advice on this
matter.
4. If there seems to be no overheating problem, yet the motor keeps cutting out, the pump’s thermal switch may
be bad. In this case the pump should be replaced.
8.12 Pump Hums And Will Not Start
If the pump impeller is not “frozen”, this condition almost always indicates a bad start capacitor.
This component is inside the motor housing.
Diagnostic Tools: Voltmeter.
Suggested Spare Parts (Page 59): Pump and motor, circuit board.
Standard Troubleshooting Approach
1. Press the Jets 1 button.
2. Check voltage at pump 1 (low speed) test points 18 and 19 (page 50-51) for 240 VAC (120 VAC for J-315). If
there is no voltage, replace the circuit board. If voltage is present, the pump needs to be repaired or replaced.
If pump 1 runs in low speed but hums in high speed, make sure the circuit board is not sending voltage to
both speeds at the same time. When voltage exists while in low speed at test points 18 and 19, there should
be no voltage at test points 18 and 20. Conversely, when voltage exists while in high speed at test points 18
and 20, there should be no voltage at test points 18 and 19. If voltage is present across both sets of test points
at the same time, replace the circuit board.
Recommended Test Points (Pages 50 and 51):
• Pump 1 - Low speed test points 18 and 19; high speed test points 18 and 20.
• Pump 2 - High speed test points 21 and 22.
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