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Lennox · Heat pump

65544 More than 8 thermostats in a group

Low severity

What the control is telling you

More than eight smart hubs assigned to one group; repeats every minute (dealer information). S30/S40 thermostat alert code 65544.

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

Likely causes

  • Too many hubs in one group

Test and repair steps

  1. Reassign smart hubs so a group has no more than eight (clears when five or fewer detected per manual).

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Source: Lennox Residential Communicating Systems Alert Code Guide (V2) 100017 (3/2023), Table 2 Alert Codes and Troubleshooting, p.48. 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.