1021
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1022 SMALL AIR COMPRESSOR
08
TROUBLESHOOTING
WARNING: Repair or maintenance shall only be performed by Keiser-certified technicians.
Failure to follow these
instructions can result in death, electrical shock, or fire.
WARNING: Risk of Unsafe Operation. The air compressor cycles automatically when power is on. When troubleshooting,
you may be exposed to voltage sources or compressed air. Before troubleshooting, unplug or disconnect the electrical
supply to the air compressor, purge air pressure, and allow the air compressor to cool.
Error Code
Description/Symptoms
Probable Cause
Solution
E r 1
Check Valve leak detected.
Check Valve failure. Once
the compressor builds up
pressure and shuts off,
the pressure bleeds down
rapidly to a low pressure
(approximately 10 psi).
Replace Check Valve.
E r 2, E r 8
Motor run-time is too long
(over one hour); failure to
reach shut-off pressure
(approximately 120 psi).
NOTE: Shut-off will occur
every 5 minutes to purge the
dryer assembly (display:
E r
8
). If after 20 cycles the unit
fails to reach the shut-off
pressure, the compressor will
shut down and not restart
(display:
E r 2
).
Air leak within the system.
Check for air leaks in the
compressor and air line system:
1. Disconnect all exercise
machines from the
compressor.
2. Reset the compressor
(disconnect, then reconnect to
power supply).
3. Run the compressor.
Check the display for building
pressure and shut-off pressure at
approximately 120 psi.
If the compressor builds pressure
and shuts down at shut-off
pressure, the leak is likely at an
exercise machine or in the air
supply line. Check the Air Line
system for leaks; connect exercise
machines one at a time to check
for leaks.
If the compressor fails to shut
down (exercise machines are
disconnected), the leak is likely
in the compressor. Check the
compressor hoses/fittings for
leaks.
E r 3, E r 4, E r 5
Purge tank pressure did not
drop fast enough.
NOTE: The purge tank
must bleed air through the
dryer to regenerate. This
must happen before the
compressor can restart. If
this takes too long, these
error codes will display.
Blockage in the Dryer
Module.
Replace the Dryer Module and
Elbow Connector if corrosion is
detected.
Mechanical failure of the
Solenoid Valve
Replace the Solenoid Valve.
If you suspect a problem with the air compressor, check the Display Lens for an error code (“E r” followed by a number).
An error code will remain on the display until the error self-corrects or when the compressor is reset (disconnect and
re-connect to power supply) in an attempt to fix the error. The following table lists the
error code descriptions, probable
causes, and solutions.
