Deutz TCD2012LO4 Engine

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• Working pressure rises during operation and causes safety valve to blow.
  Cause: Regulating valve incorrectly set or defective.; Air leaks in regulating system.; Unloading valve stuck.; Safety valve defective.
  Fix: Check and, if necessary consult Atlas Copco.; Check hoses and their fittings. Stop leaks and, if necessary consult Atlas Copco.; Check and, if necessary consult Atlas Copco.; Check safety valve; consult Atlas Copco.
• Unit does not load after pressing the loading button.
  Cause: Regulating valve defective.
  Fix: Check and if necessary consult Atlas Copco.
• Temperatura de salida del motor alta H5
• Starter motor does not crank engine after switching startbutton (S) to ””.
  Cause: Low battery output
  Fix: Check electrolyte level and charge battery. If no cells are shorted and battery is discharged, trace cause and correct.
• Starter motor cranks engine when switching start button (S) to ””, but engine does not fire.
  Cause: Low battery output
  Fix: See corrective action 1.
• Presión de aceite baja H6
• Noticeable bearing play felt in compact bearings.
  Cause: Compact bearings
  Fix: Replace the compact bearings.
• Insufficient engine oil pressure.
  Fix: Release button after engine oil pressure has built up above the minimum allowed level. Stop at once, consult the engine instruction manual.
• Indicación de carga H3
• If any bearing play is perceivable, adjust the bearings.
  Cause: Bearing play
  Fix: Adjust the bearings.
• Hourmeter (P1) does not count running time.
  Cause: Hourmeter (P1) defective
  Fix: Replace.
• Fuel tank contains insufficient fuel.
  Fix: Fill fuel tank.
• Fluido refrigerante insuficiente H7
• Excessive compressor oil consumption. Oil mist being discharged from air outlet valves.
  Cause: Compressor oil level too high.
  Fix: Check oil level. Release pressure and drain oil to correct level.
• Engine overheating.
  Cause: Insufficient engine cooling.; Engine oil cooler clogged externally.
  Fix: Relocate compressor.; Clean engine oil cooler. Refer to section Cleaning coolers.

Compiled from service & troubleshooting documentation across every generator set that uses the Deutz TCD2012LO4.

Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.