Balboa Water Group BP 60Hz - Manual (Page 43)

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Manufactured under one or more of these patents. U.S. Patents: 5332944, 5361215, 5550753, 5559720, 5,883,459, 6253227, 6282370, 6590188, 6976052, 6965815, 7030343, 7,417, 834 b2,
Canadian Patent: 2342614, Australian patent: 2373248 other patents both foreign and domestic applied for and pending. All material copyright of Balboa Water Group.
42211B
Begin the diagnosis with the power off. Check sensor 1.
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).
Note: When removing a sensor wire from the board,
depress the tab. Do not pull on the wire.
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.)
6. Within a minute or so, see if the same or other sensor is
now reading consistently higher:
If the same sensor (
UÊ A vs B or T vs H) is reading higher
after the sensor interchange, the problem is on the
circuit board. Replace the circuit board.
If the opposite sensor is now reading higher, the
UÊ
problem 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.
Testing the Sensor Set
Depress tab
when removing
TEMPERATURE SENSORS LOCATION
(WIRES REMOVED)