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8.2 - FAILURE TO DEPRESSURISE
VISUAL INDICATION
All pressure gauges
showing line
pressure for longer
than 5 minutes
All gauges showing
line pressure
POSSIBLE CAUSE
Loss of power
Poor signal pressure
to exhaust cylinder
Sticking exhaust
cylinder
Bypassing exhaust
cylinder
Neon indicator is on
dryer goes through
cycle sequence
CHECK
Power on lamp and
incoming supply
Check using
pressure gauge at
cylinder
Remove and check
operation manually
Remove non
pressurised side
tube, check for air
leak from fittings
Check function by
bypassing
Check function by
removing tubes
Check for air leak at
exhaust valve.
Check cycle time.
Exhaust valve failure
to open
Check operation and
leaks on solenoid
valve
Page 33 of 36
REMEDY
Replace fuse check
wiring
Trace leak causing
low pressure
Lubricate if necessary
or replace seals
Replace seals or
cylinder
Change if necessary
Change if necessary
Change if necessary
Adjust if necessary
Check exhaust valve
operation
Check for air leaks on
control fittings .
Replace if necessary.
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