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Page 13
Troubleshooting
Before continuing, turn off power as previously noted in WARNING
and CAUTION sections on the previous 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: Humidity 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.
Service Parts
7
Order replacement
parts by Part No.,
not by Key No.
5
Key No. Part No.
Description
1
97018349
Mounting Frame
2
97018721
Knockout Plate & Screws
3
97018382
Housing
4
97018474
Wiring Panel/Harness Assembly
5
97019012
Humidity Control Assembly & Grille Assembly
(includes Key Nos. 10, 11)
6
97020845
Control Assembly & Motor
7
97018331
Duct Connector - 6"
8
99020301
Blower Wheel
9
97018768
Scroll Assembly
10
99140208
Grille Spring (2 req'd)
11
99111542
Lens
12
99271381
Bulb, GU24 18W 3500K Fluorescent (2 req'd)
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ZB110HL Installation Guide
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