HP 304 — Error codes & fixes
Troubleshooting guide for the HP 304. Diagnose an error code and find the fix.
Paper out (E4)
E4The paper tray is empty or the printer cannot pick up paper.
Source: HP Support — printer error codes
Confidence: 80%
Verified Aug 9, 2026
Scanner failure (E5)
E5The scanner motor or bulb has failed, often fixed by a power reset.
Source: HP Support — printer error codes
Confidence: 75%
Verified Aug 9, 2026
Printer overheat (E6)
E6The printer has overheated and needs time to cool down before resuming.
Source: HP Support — printer error codes
Confidence: 75%
Verified Aug 9, 2026
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