HVACopediaAll brands · Refrigeration troubleshooting
High head pressure / scaling
What is going on
Possible causes and checks for: high head pressure / scaling.
Likely causes
- Spray pump or nozzles plugged
- Fouled coil/fill
- Fan or louvers not responding
- Water shut off in cold weather with insufficient air capacity
- Drift eliminators plugged
Check in this order
- Spray coverage, scale, capacity controls, water treatment
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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.