'PF' or 'power failure' message on display after an outage; the clock is flashing.

Safety: If you suspect wiring issues, turn off power before inspecting.

• Reset clock: Press any key to clear the PF message and reset the clock according to the user manual.
• Check for repeated PF: If PF appears frequently without known outages, inspect the terminal block for loose or burnt connections and tighten as needed.
• Electrical supply: Have an electrician check for voltage drops or loose connections in the home wiring if PF recurs.