A, first check your wiring method is correct, read the instructions carefully constant voltage wiring methods: the high water level should be connected to the upper limit of the pointer, the pointer to the lower level access, low water pick activities pointer; probe line switch to "pressure."

 B, if it is determined no connection problem, please use the following simple method to detect whether there are quality control issues:
 ▲ first disconnecting the gauge three signal lines, then three short copper;
 ▲ start: on the air switch, the controller at the bottom of the switch to ON, the motor may run at this time may not be running, but shorter terminal being connected to the pool, the low water level, the pump must be running at this time; then disassemble, short connected to the pool of high and low water level, the pump is stopped at this time. this is switched on or off will delay 3-5 seconds, the controller delay is to make contact more fully, to avoid malfunction.

 C, to determine:
 ▲ If these actions have a problem, then the controller itself has quality problems, please contact your dealer for replacement or repair;
 ▲ If that is no problem, you can certainly be an installation error or a problem with the electrical contacts, for example, the table pointer oxidation.