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Temperature Variation Inside Cargo Box — Uneven Cooling by Zone

Likely causes

Evaporator fan imbalance or partial fan stop

Check: Measure each fan motor current: within ±15% of rated is normal — if 0 or excessive, check that fan

What to do: Replace fan motor → re-check blade balance → clean fan guard and reassemble

Poor cargo loading — airflow obstruction

Check: Check cargo clearances: 5cm from side walls, 15cm from ceiling, 30cm from return grille required

What to do: Reload cargo — ensure air circulation → use pallets for floor clearance → consider installing air curtain

Air deflector deformed or dislodged

Check: Visually inspect deflector angle and mounting at evaporator discharge — check for dislodgement or twisting

What to do: Re-secure deflector (mounting bolt torque 2–3 N·m) → replace if severely deformed → re-measure temperature distribution after adjustment

Field tip

For temperature variation checks, place calibrated thermometers at 3 points (front/middle/rear) for at least 1 hour before comparing — single-point measurement is unreliable.

All 565 cases work offline in R-Pro, with error codes for 62 brands and P-T data for 108 refrigerants.

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