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Low head pressure persists in winter, or loss of capacity in summer

What is going on

Possible causes and checks for: low head pressure persists in winter, or loss of capacity in summer.

Likely causes

  • Split condenser valve not energizing/de-energizing (pilot
  • Coil
  • Control thermostat/pressure switch)
  • Summer condenser check valve leaking
  • Bleeder line check valve/solenoid stuck
  • Charge trapped in summer condenser

Check in this order

  1. Valve coil and control signal, check valves, bleeder line

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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.