Model LC (Australia) Pool and Spa Heater
Page 17
If the meter registers voltage, the temperature
control is okay. If no voltage registers, shut off all
electrical power to the heater and remove the tempera-
ture control panel (see Fig. 25) by removing the four
screws attaching the control panel to the front of the
heater.
Hold the control panel a few inches from the front
of the heater and inspect the back of the board for
obvious damage and loose wires. Make sure the three
wire connectors are tight and that the two black
thermistor wires are securely attached on the circuit
board.
If there is obvious damage to the control board or
the wire terminals, replace the control panel.
The thermistor can be checked by disconnecting
the two black wires on the back of the control panel
and temporarily connecting a new thermistor.
Alternate Method of Checking Thermistor
Use a fixed resistor (6000-9000 ohms) to check
the temperature control board. Remove the two black
wires and attach the resistor in the same location. The
heater should operate with the same temperature
control knob in the center of the dial. If the heater fails
to operate, replace the temperature control board.
Make sure the temperature control is properly
wired, then turn on power to the heater, holding the
replacement sensor as shown in Figure 25. The heater
should fire with the temperature control knob set above
Figure 23. Testing the Pressure Switch
Figure 24. Testing the Temperature Control
Figure 25. Thermistor Sensor Test
the center of the dial (approximate body temperature).
If the heater operates, replace the thermistor. If
the heater does not operate, replace the temperature
control panel which is available as a quick change
assembly. When installing the new control panel, be
sure the gasket is properly seated, and do not over-
tighten the mounting screws. That will distort the
mounting plate, which could lead to water leaking on
the control board.
Removal and Replacement of Temperature Control
If the four screws securing the temperature
control panel have not been removed, remove them.
Follow these instructions to complete the exchange:
Black / Yellow
