Why does the D250S DUAL not start charging?
In order to start charging the supply voltage from the D250S DUAL needs to be above 13.1V at the service battery input, or above 11.5V from the solar input on the D250S DUAL. In addition the voltage on the service battery has to be above 5V.
Measure the voltage of the batteries, and verify that they are within the levels specified above.
The charger does not start charging
Explanation: In order to start charging the supply voltage needs to be above 13.1V on the supply battery input or above 11.5V on the solar input. The voltage on the target battery also needs to above 5V. The solar voltage also needs to be higher than the alternator input voltage.
Test: Test Use a voltmeter to verify that the voltages are within the levels specified above.
The error LED is flashing
Explanation: The charger has detected a problem. This LED is always flashing with some other LEDs lit to tell what the problem is.
If only the power on lamp is lit then the temperature at the target battery is too high. The charger will not charge the battery if the temperature is above 65 °C, as soon as the temperature is lower, the charging will automatically restart.
If the alternator or solar LED or both are lit when the error led is flashing a connection problem is detected with the target battery, check the connections.