Troubleshooting
Problem | Possible cause | Solution |
---|---|---|
Short of capacity | Liquid flow too low | Check the valves/filters. |
Leakage in system/coil block | Check the connections, brazings in the heat transfer section and the tubing. When there is a leakage in the heat transfer section, contact the manufacturer for further repair instructions. | |
Wrong flow direction in the circuiting | See Liquid cooler tube connections. | |
Air in system | Ventilate the system. | |
Fan/fans not operating | Locate the problem and repair it or change the fan unit. | |
Heat transfer section blocked up/ dirty | Vacuum clean/wash the heat transfer section. | |
Incoming air flow too low | Check the minimum distance between the unit and the obstacles
(see Positioning). Ensure that there are no obstacles for the air flow. |
|
Wrong fan rotation direction | Wrong phase sequence. Change the connection on motor coupling or from the switch board. | |
Inlet air too warm | Check the location of the units (see Positioning). Shade the unit from
the sun. The heat transfer capacity can be increased by a water jet
system. There may be hot air recirculation in the unit. Use streamers and/or wind barriers to minimize recirculation. |
|
Vibration in the unit | Broken fan | Repair or change the fan. |
Dirty fan | Clean the device; if it is unstable after cleaning, replace the fan. | |
Damaged vibration dampers | Install new vibration dampers. | |
Fan does not start | Fan frozen in fan collar | Remove ice. |
Fuse blown out | Replace the fuse. | |
Overload release | Check and reset the device from the overload release switch. | |
Wrong supply voltage | Check that the supply voltage corresponds to the value marked on
the motor sign. Restore power supply. Note: EC-fans: The error message resets automatically. The
device restarts automatically without an advance
warning.
|
|
Wrong connection | Check the connections: see Fans and fan connections and the product nameplate. | |
Break in coil or control circuit | If the switch is in the OFF position, there is a bumbling noise. Check the slack line switches. Check that the line switches close. | |
Mechanical failure | Check that the fan motor and fan blade rotate freely. Check the bearing and lubrication. | |
Short circuit in coil | Can be indicated by a blown-out fuse. Replace the motor. | |
One phase in motor may be broken | Check the connection. | |
Fan stops | Voltage break | Blown-out fuses |
Low voltage | Follow the voltage given in the product nameplate. Check the connections. | |
Fan starts, then stops | Failure in supply voltage | Check the loose connections, fuses and control circuit. |
Fan does not reach maximum speed | Wrong fan motor type | Ask the supplier about a correct type of fan. |
Too low voltage at fan motor terminals because of voltage drop | Use higher voltage or a starter transformer. Check the connections and the correct cable size. | |
Broken rotor | Check for breaks in the short-circuiting ring. Change the rotor or motor. | |
Motor takes high amp | Too low voltage | Check the size of cables. |
Too low supply voltage | Check the supply voltage. | |
Wrong rotation direction | Wrong sequence of phases | Change the connection on the motor coupling or from the switchboard. |
Fan motor overheating | Motor body or cooling openings may be dirty or blocked up, hindering proper motor ventilation. | Clean the motor and and ensure free air circulation. |
One motor phase may be open. | Check the connection. | |
Earth fault | Identify and repair. | |
Asymmetric supply voltage to motor terminal | Check the cables and connections. | |
Vibrating fan | Loose motor fixing | Tighten the fixing screws and check the alignment. |
Unbalanced fan blade/Fan blades misaligned | IEC-fan: Balance the blade or change it. EC-fan: Change the fan unit. |
|
Faulty bearings | IEC-fan: Change the motor. EC-fan: Change the fan unit. |
|
3-phase motor running as single phase | Check the connections. | |
Too big axial play | Check the bearings. | |
Abrasive noise in fan | Fan blade is chafing against fan collar. | Check the motor centering and fixing. |
Motor ventilator is chafing against the cover. | Repair the fan or cover. | |
Ventilator hits on insulation. | Prevent the touch. | |
Motor has loosened from its fixing. | Tighten the fixing bolts and rebalance the fan. | |
Exceptionally heavy noise of running | Air gap not centralized | Check the impeller placement and bearings. |
WARNING:
Before moving to the solution, ensure that the unit is in safe condition. See Residual risks. |