Balboa Water Group EL/VS 120V-240V - Manual (Page 41)

41
Testing the Sensor Set
6. Within a minute or so, see if the same or other sensor is
now reading consistently higher:
If the same sensor (A vs B or t vs H) is reading higher
UÊ
after the sensor interchange, the problem is on the
circuit board. Replace the circuit board.
If the opposite sensor is now reading higher, the problem
UÊ
is with the sensor(s). Replace the sensor set.
*If you wait more than 2 minutes after plugging the
sensors back in, heating may start (even outside a filter
in Economy or Sleep mode) due to a stray Cd/CLd/COLD
WATER condition usually detected when sensors are
being plugged in while the system is running.
7. If there is a message indicating an open or faulty sensor:
Unplug the sensor set (but leave the original sensors UÊ
in the heater) and plug in the test sensor set. Put both
sensors into the same cup of warm water (ideally above
the set temperature, so the spa won't try to heat during
this test, as there is no heater protection during this
test) and verify that they read the same temperature
(within 1°F/0.5°C).
If the problem is solved, replace the sensor set. If the
UÊ
problem is not solved, do not replace the sensor set.
Plug in the original sensor set to verify that there is not a
UÊ
connection problem.
If the problem continues after following the above steps,
UÊ
then replace the circuit board.
1. Check sensor wires for cracks or damage that may
indicate the presence of a rodent.
2. Inspect the connections of both sensors on the circuit
board. The plugs must be clean.
3. If the sensors are not totally failing but are showing
excessive (2° F/1.0 °C or more) difference between the
two sensors when not heating (a possible cause of
Sn/SnS/SENSOR SYNC, HL/HFL/HTR FLOW LOW, and
LF/LOW/FLOW/messages), do the following:
Note which sensor is reading consistently higher
UÊ
(A vs B or t vs H).
4. Unplug the two sensors from the circuit board and
exchange their positions (i.e., plug the one that was in
the “Sen. A” jack into the “Sen. B” jack and vice versa).
5. Press a panel button if any "stray" faults appeared
during the process. (Stray faults are normal when
sensors are unplugged then plugged back in while the
system is running.)