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Donaldson Company, Inc.
Problem Probable Cause Remedy
continued
Fan exhaust restricted Check fan exhaust area and remove any obstructions.
Fan rotation backwards Check fan rotation when observed through control panel
access opening. Reverse rotation if necessary.
No display on the Delta P
Controller
No power to the controller Use a voltmeter to check for supply voltage.
Fuse blown Check the fuse in the control panel. See wiring diagram
inside the control panel. Replace if necessary.
Display on Delta P
Controller does not read
zero when at rest
Out of calibration Recalibrate as described in Delta P Maintenance Manual.
Ensure the fan is not running during the calibration.
With collector discharging outside,
differential pressure is present from
indoor to outdoor
Recalibrate with the pressure tubing attached as
described in the Delta P Maintenance Manual.
Delta P Controller ON,
but cleaning system
does not start
Pressure tubing disconnected,
ruptured, or plugged
Check tubing for kinks, breaks, contamination, or loose
connections.
Not wired to the timing board
correctly
Connect the pressure switch on the timer board to
Terminals 7 and 8 on TB3.
Faulty relay Using a multimeter, test relay for proper closure. Replace
if necessary.
Troubleshooting
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