FAN TROUBLESHOOTING
Fan and Heater
Fan Troubleshooting Chart
SYMPTOM | POSSIBLE CAUSE |
Fan will not run | Blown fuse or breaker in disconnect switch |
| Main power not turned on |
| Defective wiring or loose connection |
| Incorrect wire size |
| Overload kicked out |
| Defective motor |
| Defective magnetic contactor |
Fan runs for a short period | Undersize wiring |
of time then shuts off |
|
| Low line voltage at the installation. Power |
| failure. |
| Magnetic contactor malfunctioning. |
| Defective start/stop button |
| Wrong heater strip |
Fan makes ticking noise | Fan blade hitting fan housing |
Motor bearing bad
Fan vibratesFan not mounted securely to pad. Fan not level
Fan has dirt deposit on blade
Motor shaft is bent
Blade not mounted properly on shaft
Blade out of balance
SOLUTION
Replace fuses or reset breakers
Turn power on at all disconnects
ahead of the unit
Follow wiring diagram and tighten
any loose connections
See wire size charts for proper sire
size and change if needed
Check manual reset, push in to reset
Replace motor
Check the magnetic contactor
Check to see that power supply wires are the proper size, contact your local power company.
Call power company after making
sure wire size is correct
Change magnetic contactor
Replace necessary part
Replace with proper heater strip
Stop fan and turn off electricity.
Remove fan screen and check to see
if fan blade is hitting the housing.
Adjust motor position to obtain proper
clearance.
Replace motor bearing
Mount fan securely
Level fan
Clean blade
Replace motor
Mount blade properly on shaft
Replace or have blade rebalanced
12
