Fault |
Cause |
Remedy |
Motor does not start or motor noise |
At least two power supply leads interrupted |
Eliminate interruption by fuses, terminals or power supply cables. |
Motor does not start or humming noise |
One power supply leads interrupted |
Eliminate interruption by fuses, terminals or power supply cables. |
One or more phase of winding open |
Repair / Replace motor winding |
For a single phase motor – capacitor open |
Change capacitor |
Impeller is jammed |
Open blower front cover, remove foreign body and clean |
Check or correct impeller gap setting if necessary. |
Impeller is defective |
Replace impeller |
Rolling bearing on drive motor side / blower side defective |
Replace motor bearing / blower side bearing |
Protective motor switch trips when motor is switched on. Power consumption too high |
Winding short circuit |
Have winding checked |
Motor overloaded Throttling does not match specification on rating Label |
Reduce throttling |
Clean filters, mufflers and connection pipes if necessary |
Power source unbalanced |
Check & rectify power source |
Blower is jammed |
See fault “Motor does not start humming noise. “With cause: “impeller is jammed.” |
Blower unit does not generate any or generate insufficient pressure difference |
Leak in system |
Seal leak in the system |
Wrong direction of rotation |
Reverse direction of rotation by interchange two connects leads. |
Incorrect frequency (on Blower units with frequency converter) |
Use Correct frequency |
Different density of pumped gas |
Take conversion of pressure values into account. Inquire with us. |
Shaft seal defective |
Replace shaft seal. |
Change in blade profile due to soiling |
Clean impeller, check for wear and replace if necessary |
Abnormal flow Noise |
Flow speed too high |
Clean pipes. Use pipe with larger cross-section if necessary |
Muffler soiled |
Clean muffler inserts, check condition and replace if necessary |
Abnormal running noise |
Ball bearing lacking grease or defective |
Regrease or replace ball bearing |
Blower leaky |
Seals on muffler defective |
Check muffler seals and replace if necessary |
Seals in motor area defective |
Check motor seals and replace if necessary |