Intermittent Heating - Jacuzzi J-315 Manual

.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 tub' s 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 callbacks to effect a repair.
Suspects: circuit board, temperature sensor, control panel, wiring connections, and partial water flow obstructions.
Diagnostic Tools: Voltmeter, ohmmeter and ammeter.
Suggested Spare Parts (Page 59): Heater, circuit board, temperature sensor, flow switch, control panel, circula-
tion pump, hi-limit sensor.
Standard Troubleshooting Approach
1. Check the crimped wire connections to the heater. If burned, replace the heater. Verify that the heater con-
nections are good on the circuit board. Check the heater resistance, see the current chart on page 47 for
expected heater resistance values.
2. Check the connections labeled "heater out" on the circuit board (test points 6 & 7). Refer to pages 50-51 for
your circuit board configuration. If possible, clean and renew the connections. If a relay is physically burned
at the connections, replace the circuit board.
3. Check the flow switch for proper and consistent mechanical operation. Observe the mechanical action of the
switch. Refer to page 26 for the flow switch testing procedure.
4. Clean the connections where the panel plugs into the circuit board.
5. If all of the above items check out, ask the customer if the Sn2 error has ever displayed. If the Sn2 error mes-
sage has displayed, replace the temperature sensor.
6. Tell the customer what you have done, that you are not sure that 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 Jacuzzi Hot Tubs Technical Support.
Note: All models use a 'magnetic reed switch" type of flow switch that can remain closed or open from debris interfer-
ence. 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 further than originally installed, or the paddle may stick on the bottom of the fitting.
correct
incorrect
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