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error DeWalt
Error Code 34
Incorrect oil usage — wrong type or grade of oil has been used in the pump.
? What Causes This
Using oil that does not meet DeWalt specifications or using engine oil instead of pump oil.
✓ How to Fix It
- Drain the incorrect oil completely.
- Refill with the correct pump oil as specified in the manual.
- Consult the manual for proper oil type and grade recommendations.
Source: page 6 of the official manual
From the manual
This error code appears in:
DeWalt 3300 Psi Pressure Washer