In troubleshooting, the following three aspects must be investigated.

(1) if Baotou North running heavy card accessories Clutch does not suck or motor does not rotate, first refer to the air conditioning circuit diagram, find the power supply of the component, and check whether the voltage is normal, fuse whether fuse, if the battery is directly connected to the battery, check whether the parts are loose.

(2) if there is no problem in the above inspection, the fault exists on the connection line between the power and the load. At this time, the voltage should be checked according to the circuit diagram. If the unit is directly connected with the battery, the unit is still not working, indicating that the part of the unit is bad or damaged.

(3) if the Baotou North running heavy card accessories clutch or motor does not start or stop according to the requirements (the normal system pipeline), this kind of fault occurs mainly on the control element. Only use special testing equipment to check whether switches, relays and their electronic components are working normally.

(1) the check of the switch is equivalent to the check of the on-off current of the switch.

2. Baotou North Ben heavy truck parts relay inspection is mainly for its contacts and internal loop circuit. The check of contacts is equivalent to the check of switches.

3. The check of internal coil can be checked by the measurement of coil resistance. If the coil resistance is about 100 ohms at 12V, the internal coil is normal.

(4) if the electronic temperature controller and the pressure switch are in trouble, it is better to use the special detection instrument to check, or to use the replacement method to check, that is, the new device of the same type is replaced by the possible failure analysis.