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One case too cold / too warm; erratic cycling

What is going on

Possible causes and checks for: one case too cold / too warm; erratic cycling.

Likely causes

  • EPR set wrong, snap-action vs metering type mismatch, EPR evaporator >40% of system load, EEPR thermistor/controller fault

Check in this order

  1. EPR setting via access port, load share, thermistor reading vs setpoint, valve %-open

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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.