Ecobee ecobee Smart Thermostat Enhanced with Radar Occupancy Sensor and Large Touchscreen PEK-ISSUE Error Fix: Power Extender Kit Problem

Error code PEK-ISSUE on the Ecobee ecobee Smart Thermostat Enhanced with Radar Occupancy Sensor and Large Touchscreen means: Power Extender Kit Problem. The Power Extender Kit (PEK) is not providing stable power to the thermostat — symptoms include random reboots, Wi-Fi dropping, or blank screen; verify the PEK is wired correctly at the HVAC control board with the correct wires connected to C, R, and the repurposed wire terminal

The most successful fix is "Test PEK Wiring with Multimeter and Replace Faulty Power Extender Kit" (medium difficulty, ~45 minutes). Estimated DIY cost: $15-$25. HomeMD has 2 community-ranked fixes for this error.

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Yes — the top-ranked community fix ("Test PEK Wiring with Multimeter and Replace Faulty Power Extender Kit") is rated medium difficulty and takes about 45 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Wire stripper/cutter.

DIY cost: $15-$25. Professional repair typically costs $150-$220. Many homeowners save money by trying the top-ranked community fix first.

The Ecobee ecobee Smart Thermostat Enhanced with Radar Occupancy Sensor and Large Touchscreen has 8 other known error codes, including: APP-SYNC (App and Thermostat Out of Sync), AUX-OUTDOOR (Auxiliary Heat Outdoor Temperature Alert), AUX-RUNTIME (Auxiliary Heat Runtime Alert), BLOWN-FUSE (HVAC Control Board Fuse Blown), COOL-FAIL (Cool Not Reaching Set Temperature), and 3 more.

Error code PEK-ISSUE also appears on 5 other Ecobee models: ecobee Smart Thermostat Essential with Touchscreen Display and eco+ Smart Features, ecobee Smart Thermostat Premium with Siri and Alexa Built-In, Air Quality Monitor, and SmartSensor Included, ecobee SmartThermostat with Voice Control and Alexa Built-In, ecobee3 Lite Smart Thermostat, ecobee4 Smart Thermostat. The fix may vary by model, so check each model's specific page for tailored repair steps.