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utility company problem. Arrange for correction of the
voltage as appropriate.
10.4.2 controller
The controller must be operational in order to
check the control circuits of the heater.
10.4.3 control circuit troubleshooting
The heater controls are arranged in several 24V
60Hz circuits with some operating and safety controls
arranged in series circuits.
Troubleshooting is done by probing for voltage
between the common and various points in the circuit
to determine which component is preventing operation.
Check points are indicated on Figure 28. The black
lead of the meter should be attached to the common
tap on the secondary side of the transformer and may
be left there throughout most of the procedure.
The recommended procedure steps through each
circuit in a sequential way, and each section assumes
that components from all previous sections have been
tested and are operational. However, verifying voltage
at any of the numbered points in that circuit confirms
that all prior components of the circuit are operational.
10.4.3.1 transformer
Attach the black lead of the voltmeter to the
terminal on the secondary side of the transformer
of the transformer with a yellow wire attached to it
(common). This is test point 1 on Figure 28. Touch
the free red lead of the voltmeter to the terminal on
the secondary side of the transformer with a red wire
attached to it (24V tap), test point 2. The voltmeter
should read between 20-28 Volts AC. If the voltage
does not fall within the limits mentioned above,
replace the transformer.
10.4.3.2 Fuse
Leave the black voltmeter lead in place at test
point 1. Touch the free lead of the voltmeter to test
point 3, which is on the Power Interface Board where
the red wire from the transformer enters the end of the
connector. You will need to push the voltmeter lead
into the back of the connector along side of the wire
pin. The meter should read 20-28 Volts AC. If there
is no voltage, the fuse has failed. Inspect the rest of
the wiring, especially the safety circuit, to be sure that
there is no "short" such as contact of a terminal with
the heater chassis or another terminal which may have
caused the fuse to fail. Correct any such condition and
replace the fuse. Use only a 2 amp, 1 1/4" long x 1/4"
diameter, quick acting, glass tube type fuse.
10.4.3.3 Water Pressure Switch
Start by checking the voltage at the two legs of
this circuit on the controller, see test points 4 and 5 in
Figure 28. Check the voltage at test point 4, where the
Jandy ® Legacy™ Model LRZE Pool/Spa Heater by Zodiac ®
violet wire from the pressure switch enters the two-pin
connector on the controller. If there is not 20-28 Volts
AC nominal at this point, either the controller or the
two-pin wire harness is faulty and must be replaced. If
20-28 Volts AC nominal is detected at test point 4, then
move the red lead of the meter to test point 5 where the
gray wire from the Pressure Switch enters the two-pin
connector. If 20-28 Volts AC nominal is detected at
this point, the devices in this circuit are closed and the
circuit is working properly.
If there is no voltage the pressure switch contacts
are open. This is almost always due to a water flow
deficiency, the most common one being a blocked
water filter or defective pump. However, sometimes
it is due to blockage of the copper siphon loop tube or
mis-adjustment of the switch. Investigate thoroughly,
referring to Section 7.7 on "Adjusting the Water
Pressure Switch". If there is no problem with the pool
system or pressure switch adjustment, replace the
pressure switch.
10.4.3.4 Roll-out Switch (Fusible Link)
To check the roll-out switch (fusible link)/air
louver/field interlock circuit, place the red lead at test
point 6. If there is not 20-28 Volts AC nominal, either
the controller or the two-pin wire harness is faulty,
or the water pressure switch is open. If 20-28 Volts
AC nominal is detected at test point 6, then move the
red lead of the meter to test point 7. If 28 Volts AC
nominal is detected, the circuit is closed and working
correctly. If the proper voltage is not detected, the
roll-out switch (fusible link) or vent temperature limit
has opened, or the wire harness is faulty.
If no voltage is detected at test point 7, the
roll-out switch (fusible link) or vent temperature
limit has failed. This indicates higher than normal
temperatures in the component compartment
(vestibule). The normal component compartment
temperature is well below 300°F (149°C). The roll-out
switch (fusible link) is designed to fail at temperatures
above 305°F (152°C). Excessive temperature might
be due to a blocked flue or heat exchanger. Clean
the heat exchanger and clear the flue and vent of any
restrictions. Sometimes the roll-out switch (fusible
link) fails due to flame roll-out. Flame roll-out may be
caused by delayed ignition or downdrafting in windy
areas. Thoroughly investigate the causes for flame
roll-out and correct the problem when replacing the
roll-out switch (fusible link). The vent temperature
limit will fail due to abnormal temperatures in the vent
system. Excessive temperatures will cause the switch
to open. The vent temperature limit is designed to
fail at temperatures above 464°F (240°C). Excessive
temperatures can be caused by inadequate water flow
or a damaged heat exchanger. Thoroughly investigate
the causes for roll-out switch (fusible link) failure
and correct he problem when replacing the vent
temperature limit.
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Installation and Operation Manual
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Troubleshooting
