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High amps / overload at start

What is going on

Possible causes and checks for: high amps / overload at start.

Likely causes

  • High crankcase (suction) pressure after defrost, long off cycle, hot pull-down, no unloader, starting against unequalized head pressure with low-torque motor

Check in this order

  1. Suction pressure at start, CPR setting (set to RLA), unloader/solenoid operation, bleed-type TXV or hard-start on non-equalizing systems

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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.