Intermittent Heating; Nothing Works - Jacuzzi LED Series 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 se-
ries 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 obstruc-
tions.
Diagnostic Tools
Voltmeter, Ohmmeter
Suggested Spare Parts
Heater element, circuit board, temperature sensors, pressure switch, 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 45
for expected heater resistance values.
2. Check connections labeled "heater out" on circuit board (test points 12 and 13). Refer to pages 50-53
for your circuit board. If possible, clean and renew connections. If relay is physically burned at connections,
replace circuit board.
3. Check flow switch or pressure switch for proper and consistent mechanical operation. Observe mechanical
action of switch. Refer to page 21 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 mes-
sage 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: J-LX/2011-2013 J300/J200 (with circ pump) 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 messages 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 temper-
ature and hi-limit sensors (page 57). Replace defective temperature or hi-limit sensor then test system.
3. Check transformer. See Section A24, page 58.
4 . Still no operation? Replace circuit board.
correct incorrect
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