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ZB80ML1 n ZB110ML1 Installation Guide
Page 13
Troubleshooting
Before continuing, turn off power as previously noted in
WARNING on previous page and CAUTION section on this
page.
Symptom: Fan does not run.
• Check for an open fuse or circuit breaker in building’s
service panel.
• Check two (2) plug-in connections for Motor and its
Control are seated firmly in place.
• Check two (2) plug-in connections for Sensor and its
Control are seated firmly in place.
• Check that Blower Wheel spins freely.
Symptom: Motion mode does not operate fan at
certified air flow rate.
• Check two (2) plug-in connections for Sensor and its
Control are seated firmly in place.
Symptom: Fan runs erratically.
• Check that Blower Wheel is firmly attached to Motor shaft
and both spin freely.
Symptom: Fan seems noisy.
• Check that back draft damper in fan’s Duct Connector
pivots freely. Screws used to attach duct to Duct Connector
may prevent damper from opening.
• Check that back draft damper in wall or roof cap pivots
freely. Dampers are sometimes mistakenly painted shut or
obstructed by bird or insect debris.
Symptom: Fan does not properly ventilate room.
• For spot ventilation, turn both master switch and sensor/
control wall switch ON, so sensor/control operates fan at
certified airflow rate.
• For spot ventilation followed by continuous ventilation,
increase the “TIME” setting of user-adjustable time delay.
• For continuous ventilation, increase “CFM” setting of user-
adjustable airflow rate.
Cleaning and Maintenance
To Clean
For quiet and efficient operation, long life and attractive ap-
pearance, remove Grille and vacuum interior of unit with a
dusting brush attachment.
Do not use cleaning sprays, solvents or water on, or near,
the sensor.
Motor is permanently lubricated and never needs oiling.
If motor is making excessive or unusual noises, replace
Control Assembly and Motor.
CAUTION
IN ORDER TO PREVENT MOTOR/CONTROL DAMAGE:
DO NOT remove motor plug to stop spinning motor.
Power must be disconnected (see WARNING on previous
page) before motor plug is removed or inserted into control
assembly.
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