Atlas Copco A004: Atlas Copco GA Series Error Code A004

Symptoms

Oil filter differential pressure has exceeded 1.0 bar (14.5 psi), indicating a clogged spin-on filter element. The alarm is triggered by the differential pressure switch across the filter housing.

Possible Causes

Oil filter element overdue for replacement based on runtime hours
Degraded oil causing sludge buildup in the filter media (oxidation or contamination)
Wrong oil viscosity grade used, increasing flow resistance through the filter

Troubleshooting Steps

Step 1: Check the service timer on the Elektronikon - compare actual hours since last oil filter change
Replace the spin-on filter if hours exceed 2000 or the alarm is active
Step 2: Take an oil sample and inspect for dark color, burnt odor, or metallic particles
If oil is degraded, perform a full oil change with Atlas Copco Roto-Inject Fluid and replace both filter and separator
Step 3: Verify the oil viscosity grade on the drum matches the specification sticker inside the service door
Drain and refill with correct 46-grade synthetic compressor oil if mismatch is found

How to Reset

Reset: Replace the oil filter, then press the Service Reset button on the Elektronikon for the oil filter timer. The differential switch resets automatically when pressure drops.

Common Replacement Parts

1613-6169-00: Oil filter element, GA 11-90 (Spin-on, 93 mm OD x 178 mm height)
2901-0510-00: Roto-Inject Fluid, 20L drum (ISO VG 46, synthetic PAO/ester blend)

Frequently Asked Questions

Q: How often should the oil filter be changed?
Every 2000 runtime hours or 12 months, whichever comes first. In dusty environments, reduce to 1500 hours.
Q: Can I change just the filter without changing the oil?
Yes if the oil passes a visual and odor check. However, the separator element should also be inspected whenever the oil filter is replaced.

Atlas Copco GA Series Error Code A004