HVACopediaAll brands · Refrigeration troubleshooting
High head pressure
What is going on
Possible causes and checks for: high head pressure.
Likely causes
- Scaled/fouled water tubes, low water flow (water regulating valve), water too warm
Check in this order
- Water in/out temperatures and flow, clean tubes (mechanical for shell-and-tube/rectangular tube-in-tube
- Chemical for shell-and-coil)
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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.