Troubleshooting A Thermal Pump Cutout; Pump 1 Hums And Will Not Start - Jacuzzi LED Series Troubleshooting 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 consumption 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 6 and 7.
North American 60 Hz Models:
All models (except J-315/J-325): 240 VAC ±10%
J-315/J-325: 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 pres-
ent, the pump needs to be repaired or replaced. Try replacing the pump's start capacitor. If the pump
still doesn't work, replace pump.
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