Troubleshooting A Thermal Pump Cutout; Pump 1 Hums And Will Not Start - Jacuzzi LED Series Manual

8.13 Troubleshooting A Thermal Pump Cutout

1. Verify voltage to hot tub is 240 VAC ±10% (or 120 VAC ±10% for convertible models). An
insufficient voltage supply can cause the motor to pull too much current and overheat. The
situation must be corrected.
2. Check voltage to hot tub.
3. If voltage is OK, examine the environment in which the hot tub is installed. Hot sun, hot weather, and lack
of breeze can cause heat build up in the equipment bay in addition to the normal heat produced by the
pump. This can raise the temperature high enough to cause the pumps thermal cutout to trip. There are
two possible solutions to thermal pump cutout problems which are not due to low line voltage. One is to
change the filter cycle period so that it does not coincide with the hottest time of day and peak power con-
sumption hours. Another is to ventilate the equipment bay. Call technical support for advice on this matter.
4. If there seems to be no overheating problem yet the motor keeps cutting out, the motor's thermal switch
may be bad. In this case the pump should be replaced.

8.14 Pump 1 Hums and Will Not Start

If the pump impeller is not "frozen", this condition usually indicates a bad start capacitor. This
component is inside the pump motor housing.
Diagnostic Tools: Voltmeter
Suggested Spare Parts: Pump, Capacitor, Circuit Board
Standard Troubleshooting Approach
Press JETS 1 button. Check voltage at the following circuit board test points 5 and 6.
North American 60 Hz Models:
All models (except J-315/J-325/J-210): 240 VAC ±10%
J-315/J-325/J-210: 120 VAC ±10%
Export 50 Hz Models:
All models; 230 VAC ±10%
All Models
If there is no voltage present at the recommended test points, replace circuit board. If voltage is present, the
pump needs to be repaired or replaced. Try replacing the pump's start capacitor. If the pump still doesn't work,
replace pump.
If pump 1 runs in low speed but hums in high speed, make sure circuit board is not sending voltage to both
pump windings at the same time. Disconnect pump wires from the circuit board before performing this
test. Test for voltage at test points 5 and 6. When voltage exists at test points 5 and 6 there should be no volt-
age at test points 5 and 7. Conversely, when voltage exists at test points 5 and 7, there should be no voltage at
test points 5 and 6. If voltage is present across both sets of test points at the same time, replace circuit board.
Refer to pages 50-53 for your specific circuit board layout.
DANGER: Electrical Shock Hazard Exists!
High Voltage Present on Circuit Board. Use
Extreme Caution while Servicing Circuit Board.
mmm...
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