LX and LT Low NOx Pool/Spa Heater Page 33
9.2 Service Codes
The LX and LT Low NOx controllers monitor
several functions of the heater. In the event of a
malfunction, the LX controller will display a service
code on the left side of the LCD screen under the LX
logo (see Figure 34). The model LT displays this
information by lighting a set of indicator lights located
on the front of the control panel (see Figure 35). Table
11 lists the LX and LT Low NOx Heater Service
Codes along with potential causes and remedies.
Note: When the service codes marked with an
asterisk (*) are displayed, the controls are still
operable and the heater will operate normally
when the displayed condition is remedied. Fault
codes without an asterisk (*) will shut down the
heater and control panel, and a flashing
"Service" icon will be displayed.
9.3 Ignition Control LED Service Codes
In addition to the service codes shown in the
previous section, the ignition controller in both the LX
and LT Low NOx model heaters has an LED light that
flashes to indicate various different faults. Table 9 lists
the LED codes and the corresponding fault description:
Table 9. Ignition Control LED Fault Codes
LED Code Fault Description
The LED light is on Ignition Control Fault. Refer to
continuously. qualified service personnel.
LED single flash. Air flow fault.
LED double flash. Flame exists when there is NO call
for heat. Refer to qualified service
personnel.
LED triple flash. Ignition lockout (heater has cycled
three (3) times and locked out after
the third try).
Figure 34. LX Control Panel
LAARSLAARS
POOL/OFF/SPA
BACKLIGHT
RS SERVICE
ON LINE FOR
OPERATION
WITH
CONTROLLER
AquaLink RS
TM
LAARS
POOL
OFF
SPA
Heating
SERVICE
*
*SERVICE DIAGNOSTICS-SEE INSIDE FRONT DOOR
F°/C°
SELECT
THERMOSTAT SETTINGS
Low Pressure
Hi Lim Sw
Ext Sw 1
Air Flo Sw
AGS
Ext Sw 2
Temp
Sensor
188
188
°F
°C
°F
°C
RS Online
Water
Tem p
Thermostat
Setting
Pool Spa
F° C°
Figure 35. LT Control Panel
Figure 33. Flame view at high speed
VIEW PORT
BURNER
FLAME
Figure 32. Flame view at low blower speed
VIEW PORT
BURNER
FLAME
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