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2.
Touch the voltmeter leads to both terminals on
one high limit switch, then the other. If the meter does
not register voltage on one terminal, the high limit is
bad, and must be replaced.
d. Testing the Pressure Switch
Touch the meter lead to the black wire on the
pressure switch (see Fig. 23) with the filter pump
running. If the meter registers no voltage, the contact
points are open. Use the following steps to check it.
1.
Back wash the filter before trying to test the
pressure switch.
2.
Connect one voltmeter lead to the blue wire
terminal on the transformer and the other lead to
the black wire terminal on the pressure switch.
3.
Cycle the filter pump ON and OFF a few times.
The meter should jump to full voltage when the
pump cycles ON.
4.
If the meter does not show voltage, either a
defective pressure switch or clogged siphon loop
tube could be the problem.
5.
To clean the siphon loop tube, remove it from the
heater and the switch.
a. Blow out the tube until clear.
b. Fill the siphon loop tube and the switch with
heavy, non-detergent oil, SAE 50 preferred,
using a pump-type oil can (see Fig. 15).
c. Install the siphon loop tube to the heater and
the pressure switch. The tube must be air tight.
d. Start the filter pump and retest the pressure
switch (Step 2 through 4 above). If cleaning
the siphon loop tube does not correct the erratic
voltmeter, replace the pressure switch.
Step Three
Temperature Control
The temperature control is a solid-state device
using an electronic water temperature sensor called a
thermistor. The thermistor sensor is located in the
header.
Make sure the control panel rotary switch is in
either the POOL or SPA position, and that the corre-
sponding temperature control knob is set at a higher
temperature than the pool water.
With one of the voltmeter leads still clipped to the
blue wire terminal on the transformer, touch the other
lead to the black-yellow wire terminal on the ignition
control (see Fig. 24).
Figure 21. Testing Wire Harness and Limit Switches
Figure 22. Testing Wire Harness and Limit Switches
