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Lennox · Heat pump

E182 Outdoor suction temperature sensor fault

Medium severity

What the control is telling you

Suction temperature sensor reading below 0.25 V or above 4.75 V for 24 h (+/- 3 h); system keeps running normally. S30/S40 thermostat alert code 182 (shown as E182 on the unit control display).

Applies to: Lennox communicating heat pumps incl. variable-capacity inverter units in S30/S40 smart thermostat systems

Likely causes

  • Failed sensor or wiring

Test and repair steps

  1. Check the sensor wiring and connector.
  2. Check sensor resistance against the unit chart and replace if bad.
  3. Resets after 3 consecutive in-range readings.

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Source: Lennox Residential Communicating Systems Alert Code Guide (V2) 100017 (3/2023), Table 2 Alert Codes and Troubleshooting, p.18. Summarized in our own words; check the original manual for your model.

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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.