TROUBLESHOOTING
WARNING:
• These procedures must be performed by a qualified HVAC technician or
electrician.
• Risk of personal injury or death could occur by attempting to troubleshoot or
repair this unit by untrained persons.
• Exercise the usual precautions when working with high voltage.
• When the circuit has been de-energized, always discharge any residual current
in the secondary circuit with an insulated handle screwdriver.
• Always ground power supply and Ionizing-Collecting cell when bench testing.
RECOMMENDED SERVICE TOOLS
• Screwdriver, 8” common with insulated handle (plastic)
• Screwdrivers, Phillips #1 and # 2 with insulated handle (plastic)
• Needle Nose Pliers with insulated handles (plastic)
• Multimeter
• High Voltage Probe
INDICATION OF ELECTRICAL TROUBLE
The air cleaner is equipped with a Red CELL ENERGIZED light for indicating proper unit
operation. When the unit is in normal operation (with the HVAC system blower running,
Front Panel Assembly in place and ON/OFF switch in the ON position) and the Red CELL
ENERGIZED light is not illuminated, the problem is a shorted secondary circuit or Air Flow
Sensor fault. Although failure of the indicating light itself should not be overlooked, this
condition is unusual.
AIR FLOW SENSOR (AFS) TROUBLESHOOTING
WARNING:
The following procedure must be performed by an authorized HVAC contractor.
Failure to do so may expose an individual to serious personal injury or death.
1. Make sure the HVAC system blower is not operating, the ON/OFF switch is in OFF
position and the circuit breaker is turned OFF or input power cord is disconnected.
2. Remove the Front Panel Assembly.
3. Remove the cover from the Power Tray Assembly by removing the two screws on top
of unit.
4. Locate the AFS, a small circuit board with a small gray disc connected to the board by
two silver wires (see Air Flow Sensor (AFS) pg. 2). Carefully bend the thermistor (small
gray disc) wire leads so the thermistor is located in the center of the 3/16” diameter
hole in the Power
T
ray
Assembly and approximately 1/8” from the inside edge of the
Power Tray Assembly front.
Troubleshooting
20
For Qualified HVAC
Installer Only
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