Honeywell High Temperature Indication / Sensor Reading Above Range

Honeywell AC displays HI instead of a temperature and may run continuously.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Room temperature above measurement range, Room sensor open circuit, Sensor disconnected, Control board sensor input fault

Steps:

Check ambient temperature: If the room is extremely hot (above the unit's rated range), HI may be normal. Improve ventilation and reduce heat sources.
Inspect sensor: Remove the front cover and verify the room sensor is connected and not broken.
Test sensor: Measure resistance; an open circuit will cause HI. Replace the sensor if open or physically damaged.
Control board: If a new sensor does not resolve HI, the main PCB may be faulty and require replacement.

Medium 3/5

Room Temperature Sensor

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