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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 dif cult intermittent problems are to locate. You will be do-
ing 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 STA 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 ow
obstructions.
Diagnostic Tools: Voltmeter, ohmmeter and ammeter.
Suggested Spare Parts (Page 59): Heater, circuit board, temperature sensors, ow switch, control
panel, circulation pump, hi-limit.
Standard Troubleshooting Approach
1.
2.
3.
4.
5.
6.
7.
Check the crimped wire connections to the heater. If burned, replace the heater. Verify that the
heater connections are good on the circuit board. Check the heater resistance, see the current chart
on page 47 for expected heater resistance values.
Check the connections labeled “heater out” on the circuit board (test points 6 & 7). Refer to pages
50-51 for your circuit board con guration. If possible, clean and renew the connections. If a relay is
physically burned at the connections, replace the circuit board.
Check the ow switch for proper and consistant mechanical operation. Observe the mechanical ac-
tion of the switch. Refer to page 26 for the ow switch testing procedure.
Clean the connections where the panel plugs into the circuit board.
If all of the above items check out, ask the customer if the Sn2 error has ever displayed. If the Sn2
error message has displayed, replace the temperature sensor.
Tell the customer what you have done, that you are not sure that the problem has been xed, 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.
If the customer calls back, call Jacuzzi Premium Technical Support.
Note: All models use a ‘magnetic reed switch” type of ow switch that
can remain closed or open from debris interference. Removal of the ow
switch for cleaning and inspection will correct most problems. Record the
number of turns it takes to remove the switch from the tting. After clean-
ing, 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 tting.
correct
incorrect