Honeywell TH6220D1028 FocusPRO 6000 2H/2C Programmable Thermostat TEMP-WRONG Error Fix: Displayed Temperature Reading Is Wrong

Error code TEMP-WRONG on the Honeywell TH6220D1028 FocusPRO 6000 2H/2C Programmable Thermostat means: Displayed Temperature Reading Is Wrong. The temperature shown on the thermostat differs significantly from the actual room temperature — caused by thermostat placement on an exterior wall, near a window, in direct sunlight, above a heat source, or near a supply vent; use the temperature offset/calibration feature in settings (ISU parameter 88 on T6 Pro, Settings > Preferences on WiFi models) to apply a correction of up to ±3°F

The most successful fix is "Relocate Thermostat to Improve Temperature Accuracy" (medium difficulty, ~60 minutes). Estimated DIY cost: $5-$20. 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 ("Relocate Thermostat to Improve Temperature Accuracy") is rated medium difficulty and takes about 60 minutes. Tools needed: Flathead screwdriver, Drill with screwdriver bit, Level, Wire labels.

DIY cost: $5-$20. Professional repair typically costs $120-$180. Many homeowners save money by trying the top-ranked community fix first.

The Honeywell TH6220D1028 FocusPRO 6000 2H/2C Programmable Thermostat has 8 other known error codes, including: APP-OFFLINE (Thermostat Shows Offline in App), AUX-HEAT ("Aux Heat" Displayed), BLANK-SCREEN (Blank/Dead Display — No Power), BLOWN-FUSE (HVAC Control Board Fuse Blown), COOL-ON-FLASH ("Cool On" Flashing on Display), and 3 more.

Error code TEMP-WRONG also appears on 7 other Honeywell models: RTH7600D 7-Day Programmable Thermostat with Backlit Display, RTH9585WF Wi-Fi Color Touchscreen 7-Day Programmable Thermostat, T10 Pro Smart Thermostat with RedLINK Room Sensor, T6 Pro Programmable Thermostat (TH6320WF / TH6220U), T9 Smart Thermostat with Smart Room Sensor, TH4210U2002 PRO 4000 5-2 Day Programmable Thermostat, and 1 more. The fix may vary by model, so check each model's specific page for tailored repair steps.