Basic Installation of GL-235
Figure 2
“CHECK SENSOR” indicator on
If the “CHECK SENSOR indicator is on and NOT blinking, there may be a possible open circuit or
short circuit with the pool sensor. Using a voltmeter, measure the DC voltage across the terminals
of the pool sensor as indicated in figure 5. If the voltage is close to zero volts, the sensor has a short
to ground. Remove the sensor from the terminal block and measure the voltage across the pool
terminals again. If the voltage is still close to zero volts, there is an internal short and the unit must
be returned for repair. If the voltage is close to five volts, the pool sensor itself may be at fault.
With the sensor disconnected from the unit, measure the resistance of the sensor using an ohmmeter.
At room temperature (25ºC/77ºF) the sensor should measure approximately 10K ohms (10,000
ohms ± 1%). For other resistance measurements at different temperatures, consult the table at back
of manual. If the sensor is not returning the correct value, it is defective and will need to be replaced.
If the sensor is returning approximately the correct value, reconnect it to the terminals marked
“POOL SENSOR”. If the “CHECK SENSOR” indicator remains on, the unit is defective and needs
to be replaced.
“CHECK SENSOR” indicator blinking
If the “CHECK SENSOR indicator is blinking, there may be a possible open circuit or short circuit
with the solar sensor. Using a voltmeter, measure the voltage across the terminals of the solar sensor.
If the voltage is close to zero volts, the sensor has a short to ground. Remove the sensor from the
terminal block and measure the voltage across the solar terminals again. If the voltage is still close
to zero volts, there is an internal short and the unit must be returned for repair. If the voltage is
close to five volts, the solar sensor itself may be at fault.
With the sensor disconnected from the unit, measure the resistance of the sensor using an ohmmeter.
At room temperature (25ºC/77ºF) the sensor should measure approximately 10K ohms (10,000
ohms ± 1%). For other resistance measurements at different temperatures, consult the table at back
of manual. If the sensor is not returning the correct value, it is defective and will need to be replaced.
If the sensor is returning approximately the correct value, reconnect it to the terminals marked
“SOLAR SENSOR”. If the “CHECK SENSOR” indicator remains on, the unit is defective and needs
to be replaced.
If FREEZE PROTECTION is enabled:
When a sensor is disconnected from the unit and freeze protection has been enabled, the SENSOR
FAULT light will NOT activate. The GL-235 will recognize this as a freeze condition and activate
freeze protection.
6 7
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