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All brands · Refrigeration troubleshooting

Tube pitting or scaling

What is going on

Possible causes and checks for: tube pitting or scaling.

Likely causes

  • Water velocity > 10 fps (pitting) or < 7 fps (scale)

Check in this order

  1. Correct flow. p.917 [891]

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Related

Calculators and reference tables

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Source: General HVAC service practice — verify per model. Written in our own words; check the manual for your exact model.

For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.