LX and LT Low NOx Pool/Spa Heater Page 43
Check the igniter with the ohmmeter. Disconnect
the igniter wires at the quick disconnects. Place one
lead of the meter on each wire of the igniter. The
resistance should read between 40 and 75 Ohms at
ambient air temperature. If the meter reads outside of
this range or shows an open or short circuit, replace
the igniter.
If voltage does not appear between points H and
I during the trial for ignition, there may be a bad
connection or a short on the power distribution board
or the ignition control. Check all connections on the
power distribution board and the ignition control for
loose or corroded connections before continuing with
this checkout procedure.
If your heater is connected to a 230 VAC
supply, perform the following procedure. If your
heater is connected to a 115 VAC supply, skip to
the paragraph indicated with bold type. Place the
black lead of the meter in contact with the pin on the
power distribution board that is labeled "ACH" (test
point C). Place the red lead of the meter in contact
with the pin on the power distribution board that is
labeled "L1" where the black wire is connected (test
point J). The meter should read 196-253 VAC. If the
meter shows voltage outside of this range, the power
distribution circuit board has a loose connection or has
shorted. Check the connections or replace the board.
If the meter shows voltage within the range above,
then move the red lead to the "L1" connection on the
ignition control (test point K). Incorrect voltage here
means that the wire between the power distribution
board and the "L1" connection on the ignition control is
faulty. Check the connections or replace the power
distribution board. Voltage at test point K shows that
voltage is getting to the ignition control. Now move the
red meter lead to the "IGN 240" connection on the
ignition control (test point L). No voltage at this
location during the trial for ignition means that the
ignition control has failed and needs replacement. If
the ignition control is working properly, it will have
stepped the voltage down to 98-126 Volts RMS (50-65
Volts non RMS) for use by the igniter. If the correct
voltage is shown, then place the red lead of the meter
in contact with the pin on the power distribution board
that is labeled "I/240" where the white wire with the
black trace is connected (test point M). No voltage
means that the wire between the power distribution
board and the "IGN 240" connection on the ignition
control is faulty. Check the connections or replace the
power distribution board. If the correct voltage is
detected, place the black lead of the meter in contact
with the pin on the power distribution board that is
labeled "ACN" where the red wire is connected (test
point B). Place the red lead of the meter in contact
with the pin on the power distribution board that is
labeled "L2" where the red wire is connected (test
point N). No voltage at this point means that the power
distribution circuit board has shorted and needs to be
replaced. If the voltage is correct, move the red lead
to the connection at the igniter wire quick disconnect
(test point H). No voltage means that the wire be-
tween the power distribution board and the igniter test
point H is faulty. Check the connections or replace the
power distribution board. Place the red lead of the
meter in contact with the pin on the power distribution
board that is labeled "IGN" where the red wire is
connected (test point P). The meter should show 196-
253 Volts when the control is not energizing the igniter
or 169-219 Volts RMS (147-192 non RMS) when the
control is energizing the igniter. If the voltage mea-
sured is not within the range specified for the above
conditions, then the power distribution board is shorted
or open. Replace this component. If the correct
voltage is measured at this point, move the red meter
lead to the igniter wire quick disconnect (test point I).
If the correct voltage as measured at test point P does
not show here, the wire between the power distribution
board and the igniter test point I is faulty. Check the
connections or replace the power distribution board.
If your heater is connected to a 115 VAC
supply, perform the following procedure. Place
the black lead of the meter in contact with the pin on
the power distribution board that is labeled "ACH"
(test point C). Place the red lead of the meter in
contact with the pin on the power distribution board
that is labeled "L1" where the black wire is connected
(test point J). The meter should read 98-126 VAC. If
the meter shows voltage outside of this range, the
power distribution circuit board has a loose connection
or has shorted. Check the connections or replace the
board. If the meter shows voltage within the range
above, then move the red lead to the "L1" connection
on the ignition control (test point K). Incorrect voltage
here means that the wire between the power distribu-
tion board and the "L1" connection on the ignition
control is faulty. Check the connections or replace the
power distribution board. 98-126 Volts at test point K
shows that voltage is getting to the ignition control.
Now move the red meter lead to the "IGN 120"
connection on the ignition control (test point Q). No
voltage at this location during the trial for ignition
means that the ignition control has failed and needs
replacement. If the ignition control is working properly,
it will pass the voltage, 98-126 Volts, for use by the
igniter. If the correct voltage is shown, then place the
red lead of the meter in contact with the pin on the
power distribution board that is labeled "I/120" where
the white wire with the yellow trace is connected (test
point R). No voltage means that the wire between the
power distribution board and the "IGN 120" connection
on the ignition control is faulty. Check the connections
or replace the power distribution board. If the voltage
is 98-126 VAC, place the black lead of the meter in
contact with the pin on the power distribution board
that is labeled "ACN" where the red wire is connected
(test point B). Place the red lead of the meter in
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