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   Troubleshooting    
NO MAKE-UP AIR
  1. Are the make-up air dampers open?
    1. Will the damper blade move freely?
    2. Does the ductwork block the blade?
  2. Is the make-up air fan running?
    1. 208/3 phase fans have reset switches on their starters.
    2. Check the circuit breaker panel.
    3. Check the disconnect switch on the fan.
    4. Check belt on fan.
  3. Check the ductwork for:
    1. Flex duct in make-up air ductwork.
    2. Excessive number of elbows.
    3. Leaks.
  4. Check make-up air fan unit filters for cleanliness.
  5. Is the fan running in the right direction?
    1. Check the rotation arrow on the fan.
    2. 3 phase motors reverse direction by interchanging any 2 leads.
    3. 1 phase motors have wiring instructions printed on the motor.
  6. Fire system - If the fire system has not been armed, the microswitch may be keeping the make-up air fan "off". A Fire System Distributor must arm the unit before the fan will work.

NO EXHAUST
  1. Is the exhaust fan running?
    1. 208/3 phase fans have reset switches on their starters.
    2. Check the circuit breaker panel.
    3. Check the disconnect switch on the fan.
    4. Check belt on fan.
  2. Is the fan running backwards?
    1. Check the rotation arrow stamped on the fan.
    2. 3 phase motors reverse direction by interchanging 2 leads.
    3. 1 phase motors have wiring instructions printed on the motor.
  3. Is the correct fan over the correct hood?
  4. Check the ductwork for:
    1. Squared elbows.
    2. Excessive number of elbows.
    3. Leaks.
  5. Are the filters damaged?
    1. Dirty.
    2. Bent.
    3. Missing.

MOTOR CYCLES ON AND OFF
  1. Check amperage, make sure it is below the FLA rating.
  2. Flue gas equipment under backshelf hoods with short exhaust ducts can cause exhaust fans to cycle due to automatic thermally protected motors. Change to manual reset switch motor with class B insulation.
  3. If fan is near a heat source on the roof, i.e., refrigerator compressor, motor may cycle.
  4. Motor may be wired for 115V/1 phase instead of 208V/1 phase and vice versa. This will also cause the fan to cycle.
  5. Circuit breaker may be undersized and tripping out.

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