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SYMPTOMS
NO AIR
MINIMUM AIR
NO SPEED
ADJUSTMENT
AIR IS NOT HITTING
FLOOR
UNEVEN AIR
EXCESSIVE AIR
MOVEMENT AT DOOR-
WAY
NO HEAT
MINIMAL HEAT
EXCESSIVE HEAT
EXCESSIVE HEAT
MINIMAL HEAT
TROUBLESHOOTING
CAUSE
•
Power supply line open (no power)
•
Fuse blown/circuit breaker tripped
•
Motor overload tripped
•
Failed switch
MOTOR RUNNING/FANS ARE NOT ROTATING
•
Broken or damaged flexible hub
•
Shaft rotating inside fan
ELECTRICAL CONTROLS NOT FUNCTIONING WHEN DOOR IS OPEN
•
Selector switch is in off position
•
Door limit switch not operating
•
Air directional discharge vanes mis-adjusted
•
Inadequate intake clearance
•
Blower motor operates below speed
•
Fan rubbing against housing
•
Fan wheels clogged with dirt
•
Fan in backwards
•
Speed sensor not detecting
trigger rotation
•
Air stream too weak
•
Air steam hits obstruction
•
Negative pressure
•
Shaft rotating inside fan
•
One motor not operating
•
Nozzle not angled out far enough
•
Unit too powerful
•
Air movement too cold
•
Pushing air outside building
SEE AIR IS NOT HITTING FLOOR SYMPTOMS
ELECTRICALLY HEATED MODELS
•
Switch turned to "ON" position
•
Thermostat not set properly
•
Coils burned out due to lack of air
•
Automatic reset thermal cutout failed in open position
•
Manual reset thermal cutout tripped (if supplied)
•
Speed sensor not detecting trigger rotation
•
Without speed adjustment, failed speed sensor
•
Thermostat in wrong location - thermostat too
close to discharge
•
Improper voltage
•
Thermostat not set properly
•
Speed sensor not detecting trigger rotation
•
Incorrect speed range
•
Thermostat in wrong location
•
Thermostat not set properly
•
Insufficient air over coil
•
Improper voltage
STEAM/HOT WATER HEATED UNITS
•
Too high steam/hot water pressure
•
Inadequate air flow, fins plugged up, dirty coils
•
Insufficient removal of condensation (steam)
•
Not enough steam pressure/water temperature too low
•
Intake air below design temperature
•
Check power source, check method of control in ON
position
•
Replace fuse(s)/reset breaker
•
Internally protected motor - should reset automatically
after cool-down, if not, replace motor.
•
Replace switch
•
Replace fan sleeve/reengage coupling
•
Tighten set screws/tighten fan on shaft
•
Turn switch to "ON" position
•
Repair or replace limit switch
•
Adjust vanes to proper position, see instructions
•
Move air curtain or remove obstruction
•
Provide adequate space for air curtain
•
Improper voltage
•
Free fan from housing
•
Clean and vacuum fan wheels
•
Check fans for blade curve toward discharge
•
Adjust gap between sensor & trigger/
replace sensor
•
Adjust nozzle to proper position, adjust motor speed; see
installation instructions
•
Remove obstruction or reposition air curtain (move out
3/8" for every 1" up from the door)
•
Relieve negative pressure by providing makeup air
•
Tighten set screws
•
Repair or replace motor
•
Adjust nozzle angle to outside
•
Adjust motor speed
•
Add auxiliary heat to overcome wind chill factor
•
Adjust discharge angle back into building, adjust motor
speed
•
Replace switch or check wiring
•
Change thermostat setting
•
Correct airflow problem; replace coils
•
Replace automatic thermal cutout
•
Reset manual thermal cutout
•
Adjust gap between sensor and trigger
•
Replace speed sensor
•
Move thermostat away from air stream
•
Supply proper voltage
•
Change temperature setting
•
Adjust gap between sensor & trigger/replace sensor
•
Set dip switch to electric heated speed range
•
Move the thermostat closer to air stream
•
Change temperature setting
•
Remove restriction on intake
•
Supply proper voltage
•
Reduce steam pressure/hot water flow
•
Clean intake and coils
•
Increase trap size
•
Raise pressure for steam/increase water flow
•
Increase steam pressure/increase water flow
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REMEDY
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