Intermittent Heating; Nothing Works - Jacuzzi LED Series Troubleshooting Manual

8.2 Intermittent Heating

As with all intermittent problems, routine measurements and display panel error messages are not
trustworthy. The following procedure will eliminate the most probable causes. It is important to explain
to the customer how difficult intermittent problems are to locate. You will be doing a series of things
to eliminate the problem. Ask the customer to be patient and please cooperate by calling you back to
inform you of the hot tubs status until the problem is corrected. It might be a good idea to review this
S.T.A. with the customer. It may help he or she understand why it might take several service calls to
effect a repair.
Suspects: circuit board, temperature sensor, control panel, wiring connections, and partial water flow
obstructions.
Diagnostic Tools: Voltmeter, Ohmmeter
Suggested Spare Parts: Heater element, circuit board, temperature sensors, control panel
Standard Troubleshooting Approach
1. Check crimped wire connections to heater element. If burned, replace heater element wires. Verify
heater element connections are good on circuit board. Check heater resistance, see current chart
on page 38 for expected heater resistance values.
2. Check connections labeled "heater out" on circuit board (test points 12 and 13). Refer to pages
43-46 for your circuit board. If possible, clean and renew connections. If relay is physically
burned at connections, replace circuit board.
3. Check flow switch for proper and consistent mechanical operation. Observe mechanical action of
switch. Refer to page 16 for flow switch testing procedure.
4. Clean connections where panel plugs into board.
5. If all above items check out, ask the customer if the SN2 error has ever displayed. If the SN2 error
message has displayed, replace temperature sensor.
6. Tell the customer what you have done, that you are not sure the problem has been fixed, and that
you want to be called immediately if the problem returns. Explain what you will do if the problem
returns. Check back with the customer in a few days if you haven't been contacted.
7. If the customer calls back, call Technical Support.
Note: J300 Models use a "magnetic reed switch" type flow switch that can remain
closed from debris interference. Removal of the flow switch for cleaning and
inspection will correct most problems. Record the number of turns it takes to remove
the switch from the fitting. After cleaning, use the same number of turns to reinstall the
switch. DO NOT thread the switch farther than originally installed, or the paddle may
stick on the bottom of the fitting. Also, make sure flow arrow is pointing in direction of
flow away from heater output.

8.3 Nothing Works

Things to remember: when a system fails, there is probably one, and only one problem. Verify power
to the hot tub by observing the control panels LED display. The control panel will usually display
something as long as there is power to the hot tub. Check for error messages. Displayed error mes-
sages usually indicate the problem.
Diagnostic Tools: Voltmeter
Suggested Spare Parts: Fuses, control panel, circuit board
Nothing Works (Panel Indicators lit)
1. Plug in spare control panel. If it works, change panel.
2. Remove power from hot tub. Check connections on sensor harness and verify proper resistance
of temperature and hi-limit sensors (page 50). Replace defective temperature or hi-limit sensor
then test system.
3. Check transformer. See Section A24, page 51.
4 . Still no operation? Replace circuit board.
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