ecobee Smart Thermostat Essential (2024): quick sheet

Covers: ecobee Smart Thermostat Essential, the entry ecobee launched in 2024 (a utility marketplace lists it as EB-STATE7-01). Not the ecobee3 lite or the Premium/Enhanced, which have their own sheets.

Single sourceBrands: ecobee2 components

A small touchscreen ecobee with only six terminals and a limited stage count: 2 heat / 1 cool or 1 heat / 2 cool conventional, or a 2 heat / 1 cool heat pump, never both second stages. Needs 24 V power on R and C, or the ecobee Power Extender Kit (PEK) where there is no C wire. Calls: system too complex for it (needs Premium), PEK wiring, Wi-Fi on 2.4 GHz only, and sensor pairing.

Safety first

24 VAC only; not for line-voltage heat.
Turn off HVAC power before moving wires or installing the PEK.

How it works

Terminals: C, R, G/PEK, Y1, W1 and OB. The OB terminal is multi-use: heat pump changeover, W2 or Y2.

Supported: gas, oil, electric and forced-air systems; conventional 2H/1C or 1H/2C; heat pump 2H/1C; ecobee also lists radiant and dual-fuel heat pumps. Multi-stage systems beyond that are pointed to the Smart Thermostat Premium.

Power is wired 24 VAC through R and C (under 3 VA). Without a C wire, the PEK (sold separately) is installed, using the G/PEK terminal.

Wi-Fi 6 on 2.4 GHz only, Bluetooth LE and a sub-GHz radio for SmartSensors. Works with the SmartSensor for rooms; not with the first-generation ecobee Room Sensor.

Built-in temperature and humidity sensing; operating range listed as 14-122 °F.

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Official manufacturer documentation

Always confirm values against the tech sheet for the exact model.

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. © 2026 OnCall Tech. Original content; not a reproduction of any manufacturer document.Generic part photos (not of this brand): Digital thermostat mounted on a concrete wall by Alexander Mass, Pexels License

Diagnostic guides for this appliance

Guide · Thermostat

Thermostats: alerts and wiring codes vs real equipment faults (Nest, ecobee, Honeywell, communicating systems)

Smart-thermostat alerts are inferred from temperature and runtime trends, not read from the equipment. Google says its System Health Monitor is not a substitute for an HVAC diagnosis. Some thermostat codes are about the thermostat's own power and wiring: Nest E and N codes in one family mean it lost power it was drawing through a call wire, often fixed with a C wire. The equipment fault itself is on the furnace board LED, the outdoor unit or, on communicating systems, in the wall control's service menu.

7 steps ~20 mineasy

Guide · Thermostat

Thermostat cycle rate (CPH) settings: matching the setting to the heating and cooling equipment

Many Honeywell/Resideo and similar digital thermostats use a cycle-rate setting (cycles per hour, CPH) instead of an adjustable heat anticipator. The number tells the thermostat how often it is allowed to cycle the equipment at about a 50% load. A setting meant for an electric furnace on a steam boiler gives short, inefficient firing; a steam setting on a forced-air furnace gives big temperature swings. Check the system type, then set heat, auxiliary/emergency and compressor cycle rates to match the equipment. This is a settings job: no wiring changes and no gas work.

5 steps ~15 mineasy

Guide · Thermostat

R, Rh and Rc: when to keep the jumper and when a system has two transformers

Most forced-air systems have one 24 V transformer at the furnace or air handler, and R and Rc are tied together (a factory jumper or an internal link in the thermostat). Some homes, usually a boiler or older furnace for heat plus a separate air handler or add-on AC, have two transformers: one for heat on Rh/R and one for cooling on Rc. Joining two transformers through the thermostat can blow fuses or burn transformers. Decide which you have before landing wires, and pick a thermostat that supports separate Rh and Rc when there are two.

5 steps ~30 minmoderate

Other thermostats manuals

Manual · Thermostat

Google Nest Thermostat (2020, mirror face, no ring): quick sheet

Google Nest Thermostat launched October 2020 (model G4CVZ, sold as GA01334-US and color variants). Not the Nest Learning Thermostat (3rd/4th gen) or the Nest Thermostat E, which have their own sheets/notes.

9 components5 common failuresGoogle Nest

Manual · Thermostat

ecobee3 lite smart thermostat (EB-STATE3LT-02 and Pro EB-STATE3LTP-02): quick sheet

ecobee3 lite retail (EB-STATE3LT-02) and contractor/Pro version (EB-STATE3LTP-02). Now listed as discontinued by several distributors but very common in the field. ecobee Premium/Enhanced have their own sheet.

9 components5 common failuresecobee

Manual · Thermostat

Honeywell Home T5 / T5+ Smart Thermostat (RCHT8610WF, RCHT8612WF, RTH8800WF): quick sheet

Honeywell Home / Resideo T5 Smart Thermostat RCHT8610WF (no C-wire adapter in the box), T5+ RCHT8612WF (ships with the THP9045A C-wire adapter) and RTH8800WF retail variant. T6 Pro, T9 and T10 have their own sheets.

7 components5 common failuresHoneywell Home, Resideo