4
A4 Testing The Flow Switch
When the “FL1” or “FL2” message appears, it means the flow switch contacts have failed to close
when the circulation pump was on, or failed to open when the circulation pump was off. This
could be caused by an obstruction in the flow path or by a bad switch. The first thing to look for
is an obvious obstruction, remembering (while not likely) that it is possible for a small object to
work its way into the plumbing where it will not be obvious. After verifying no obvious blockage
exists, the flow switch can be tested. Refer to page 26 for flow switch testing instructions.
A5 About Fuses
When current passes through a conductor the conductor heats up. If the conductor is a heavy piece of wire or a
strip of metal, it will pass large currents and generate very little heat. If a wire is fine, or a strip of metal is thin,
it will heat up at lower current levels. Fuses rely on this principle to protect circuits from massive current flows
by simply melting if their current rating is exceeded. By selecting different alloys for the fuse element, fuses can
be made to have their current rating exceeded for a short period of time. Such slow-blow fuses are excellent for
protecting motor circuits where start up currents (surge currents) are higher than running currents.
Fuse
Part Number
J-315
J-325, J-335, J-345
Main Power, 20A
6660-106
X
Main Power, 30A
6660-105
X
Transformer Primary, 1.5A
6760-120
X
X
Testing Fuses
A good fuse should read continuity (Ø ohms); a blown fuse will read no continuity (infinite ohms).
Caution:
Make sure replacement fuses are exactly those listed above. Never test a fuse for continuity
while it is installed in the fuse holder.
A6 The Watchdog “- - -”
Three horizontal dashes with no other control panel indicators illuminated is a result of the Watch-
dog circuitry detecting a potential destructive condition within the hot tub.
Before making the service call, have the customer turn off power to the hot tub and wait 2 minutes, then turn it
back on. If this corrects the problem, have the customer monitor the hot tub and call if it occurs again.
There are many conditions that can cause a Watchdog error message. Except for a runaway heat condition, most
are caused by a faulty circuit board, bad hi-limit or temperature sensor. On rare occasions a control panel or a bad
transformer will cause Watchdog. Confirm this by using a test panel and testing the transformer connections on
the circuit board,
refer to appendix page 57
1. Turn the power to the hot tub off. Verify proper resistance of the hi-limit and temperature sensors (see appen-
dix page 55). Replace the defective temperature or hi-limit sensor, then re-test the system. If the Watchdog
error goes away, skip steps 2-4.
2. If the heater is not overly hot to the touch and the Watchdog displays an immediate dashed line error, the
circuit board is probably bad. Check the transformer primary and secondary voltages (page 57) before
changing the circuit board.
3. The temperature in the heater may have reached 118ºF (48ºC). If the heater got too hot, check for flow re-
strictions and correct the problem.
Summary of Contents for Premium J-315
Page 45: ...45 Appendix...
Page 62: ...62 Notes...
