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8.0 Troubleshooting without The Control Panel
• Diagnostic Tools for Sections 8.1A-8.1E:
Clamp-on ammeter, voltmeter, and ohmmeter
• Suggested Spare Parts for Sections 8.1A-8.1E:
Circuit board, control panel, temperature sensor, pres-
sure switch, flow switch, heater assembly.
8.1A No Heat or Not Enough Heat (All Models)
• Symptoms:
Low speed pump or circulation pump is moving water, panel heat indicator is lit,
water is not
getting hot.
• Configuration:
1-pump system heaters will not operate with the jets pump running in high speed unless the
circuit board is configured for 40A operation. 2-pump system heaters will not operate with both jets pumps
running in high speed, unless configured for 60A operation, or with either pump in high speed if circuit board
is configured for 30A operation. Refer to Sections 6.1-6.5, pages 16-18.
Note:
Jets pump 2 only runs in high speed.
This applies to 2011-2013 J300 Models not 2014+
Turn up temperature setpoint
to initiate a heat call (verify
“Standard Mode” F0-F3 is
voltage present at the heater
output? Test points 12 and 13.
Is voltage present at heater input?
Test points 10 and 11. See pages
Replace or reconnect wires
between heater input relay
and TB1 (main power
terminal block).
No
Yes
Replace circuit board.
Is voltage present at heater
element? Test points 25 and
Is there current draw? Refer
to Section A2 (page 45)
for expected heater current
consumption values.
Check heater element with
clamp-on ammeter around one
of the heater element wires.
Is the heater’s current draw
within ±10% of the listed
value?
Locate thermal switch inside, the
J-LX/J300 heater box, or J200
load box.
Set voltage meter to 500-1000
VAC range. Test thermal switch
by connecting voltage meter
across the terminals with a heat
call present (Fig. 4). If 120 VAC*
or 240 VAC exists, the switch is
open. If no voltage exists, the
switch is closed. Is the switch
open?
*Convertible J-315/J-325, and
J-210 models only.
Replace or reconnect wires
between heater output and
heater element.
Replace Thermal Switch and
retest spa.
Place thermometer against
heater housing and verify
temperature. Is temperature
above 130ºF?
Current draw is proof that
heater element is working.
Make sure customer knows
how to use control panel and
heater. Ask about any possible
error messages.
**Call Technical Support
Replace heater.
No
Fig. 4
Thermal Switch
Bad
Thermal Switch
Good
VAC
VAC
Optional Test Method:
you can also
remove one wire from either side of switch
and test across its terminals for continuity.
Infinite Ω=bad switch; 0 Ω=good switch
No
No
No
No
Yes
Yes
Yes
Yes
Yes
DANGER: Electrical Shock Hazard Exists!
High Voltage Present on Circuit Board. Use
Extreme Caution while Servicing Circuit Board.
**WARNING: heater temperature may have ex-
ceeded 130°F (54°C). Inspect heater. Call technical
support if visible damage is apparent.
