ecobee · Thermostat error code

Alert 1028Remote sensor not communicating

Single source Power off, standard tools

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OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work.

Related diagnostic guides

Guide · Thermostat

Thermostat reads or holds the wrong temperature

Compare the thermostat reading with a reference thermometer at the same spot. If the reading is wrong, look at location, drafts and sensors; if the reading is right but the room never reaches setpoint, the equipment is undersized, starving for air or faulty.

4 steps ~30 mineasy

Guide · Thermostat

Smart thermostat offline / Wi-Fi problems

Separate network problems (router, credentials, internet) from power problems: many smart thermostats switch the radio off when batteries or borrowed power run low. Read the brand's code first.

5 steps ~30 mineasy

Guide · Thermostat

Installing a C-wire adapter (Nest Power Connector, ecobee PEK and similar)

An adapter mounts at the furnace/air-handler board and lets the existing wires carry both the calls and constant 24 V. Check compatibility first: dual-transformer, fan-coil and communicating systems are commonly excluded.

5 steps ~45 minmoderate

More ecobee thermostat codes

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Alert 1000

Low (cold) temperature alert

Single source

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Alert 1001

High (hot) temperature alert

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Alert 1002

Sensor shut down the compressor

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ecobee · Thermostat

Alert 1003

Furnace or boiler heating problem

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Alert 1004 / 1005

Heat pump heating problem

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ecobee · Thermostat

Alert 1006

Cooling problem

Single source High-voltage / caution