LX and LT Pool Heaters
Page 21
LX/LT H
EATER
S
ERVICE
D
IAGNOSTIC
G
UIDE
D
ISPLAY
C
ODE
C
AUSE
R
EMEDY
PRESS SW *
(pressure switch)
1. Pump is not running.
1. This is a normal display when the pump is
OFF
.
No
Service Required.
2. Low pump pressure.
2.
Clean filter or clear blockage/check position of valves
in plumbing system.
3. Device connected at “Fireman
Switch” terminal block is open.
3.
This is a normal display when a device connected
to the “Fireman Switch” operates to open the
safety circuit on the heater.
4. Pressure switch fault.
4.
Adjust or replace pressure switch.
Refer to qualified service personnel.
HI LIM SW
(hi-limit switch)
1. Water temperature in heater exceeds
the internal limit.
1.
Identify and correct cause of overheating.
Refer to qualified service personnel.
2. Limit switch fault.
2.
Identify and correct loose connections or replace
switches.
Refer to qualified service personnel.
EXT SW 1
(extra switch 1)
1. Flue gas vent switch tripped.
(manual reset)
1.
Verify proper fan operation. Check for restriction or
blockage of flue. Reset switch after problem is
corrected.
2. Vent switch fault.
2.
Identify and correct loose connections or replace
switch.
Refer to qualified service personnel.
3. Fusible link fault
3.
Identify and correct loose connections or replace
fusible link.
Refer to qualified service personnel.
AIR FLO SW
(air flow switch)
1. Broken, split, pinched or
disconnected fan/switch tubing.
1.
Check tubing and replace if necessary.
2. Fan not operating.
2.
Correct fault or replace fan.
Refer to qualified service personnel.
3. Fan running slow or premature fan
failure.
3.
Verify proper wiring for 120VAC or 240VAC.
Refer to
qualified service personnel.
4. Air flow restricted at intake or
discharge.
4.
Check for proper clearances around heater and for
adequate room ventilation if enclosed. Inspect for
blockage or restriction at discharge or flue.
Refer to qualified service personnel.
AGS
(automatic gas shut-down)
1. Oscillating pump pressure.
1.
Clean filter or identify and repair cause of pump
oscillation.
2. Low gas supply pressure.
2.
Identify and repair incorrect supply pipe size or
pipe line blockage.
Refer to qualified service personnel
.
3. No flame at burners.
3.
Identify and correct loose wiring connections, or
problems with igniter, flame sensor , gas valve, or
ignition control.
Refer to qualified service personnel.
EXT SW 2
(extra switch 2)
Not used in this model.
TEMP SENSOR*
(temperature sensor)
1.
Faulty wiring or connection
2.
Failed Sensor
1.
Inspect Sensor wiring. Ensure sensor is plugged into
back of control panel.
2.
Replace Temperature Sensor.
Refer to qualified service personnel
*
NOTE:
When these messages are displayed, the Controls are still operable and the heater will operate normally when the displayed condition is
remedied. Faults (shown above without an asterisk (*) will shut down the Heater and Control Panel and a flashing “SERVICE” is displayed.
