Order parts based on your model number.
The F300 model number is located on the inside of the door.
Otherwise order parts based on the overall size of your cells.
The F300 come in 5 sizes:
The smalest model has one cell 12½ x 20.
The two cell models are 16 x 20, 16 x 25, 20 x 20, 20 x 25 inch.
The difference between the F300E and F300A is the post-filter is not included with the F300A. The F300A has the postfilter slot and a postfilter only needs to be slid in. The F300B is a 240v version of the 12½ x 20 F300A..
The F300 is identical to the F50F but a different paint color.
Your problem is:
The neon indicator light is not coming on
The cells never spark
Power box switch is ON
Door is tight in place
Blower is ON
Verify Power is Present.
Unplug the power box cord and operate a drop-light in the 3-prong receptacle
verifying an acceptable voltage and current.
Check for Shorted Cells
A shorted cell can prevent the indicator light from coming on.
Remove both cells, with door back in place operate without cells.
If the unit now appears OK with indicator light ON, then the cells have a problem.
Operate without cells
Check cells for broken wires
Check cells for bent plates
Check with one cell at a time (align cell with contacts)
Replace or Repair Power Box.
If the power box is plugged in to 120v and the Neon indicator still does not light without the cells,
then the problem is in the power box.
Check the on/off switch,
interlock door switch
Bypass the Air Flow Switch (AFS),
The AFS is a sensor that signals the power supply when air flow is present.
Disabling the AFS will simulate the ON state. Using a jumper wire, ground AFS resistor to the chassis, see
AFS Tech Notes.
Replace Air Flow Switch,
if the Neon indicator lights and unit appears to work with the AFS disabled.
Replace Power Supply,
if the Neon indicator does not light with the AFS disabled and no cells to short the output.
is not likely if test button does not spark. The neon lamp voltage should measure 125 vdc.
Bel-Aire specializes in the service of Honeywell air quality products.
Bel-Aire stocks a complete line of Honeywell electronic air cleaners and all available parts.
We stock the Honeywell Eniciracair media filters.
We stock Honeywell humidifiers as well as a full line of humidifier parts.
In 1976 Bel-Aire became an authorized Honeywell repair center for air cleaners. In the 70's repairs required diagnosing and replacing a diode or capacitor. In 2007 repairs required swapping a power box and Honeywell discontinued the repair centers.