EVCO PF Error Code

What does EVCO PF mean?

The PF (Power Failure) alarm on Evco EV3-series and EVK-series controllers indicates that the controller detected a loss of mains power and has since restored. The controller logs the power interruption event and holds the PF code on the display until an operator manually acknowledges it. Unlike temperature alarms, PF does not reset automatically — pressing any key on the controller clears the display.

Symptoms

• PF displayed on the controller screen after power is restored.
• Alarm relay may be activated until the operator acknowledges the fault.
• Controller resumes normal regulation immediately after power returns.
• HACCP log records the timestamp of the power loss event.
• Any in-progress defrost cycle may not resume; the controller restarts from the next scheduled defrost.

Common causes

• Mains power outage — grid failure or building circuit breaker trip.
• Supply voltage drop below controller operating range causing an under-voltage shutdown.
• Loose or intermittent connection at the power supply terminal of the controller.
• Facility equipment on the same circuit pulling an excessive load and tripping the breaker.
• Intentional power-down for service without proper pre-shutdown procedure.

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Diagnostic steps

1. Acknowledge the PF alarm

   Press any key on the controller front panel to clear the PF display. The controller will resume normal operation immediately if power is stable.

2. Verify supply voltage at the controller terminals

   Use a multimeter to measure voltage at the controller power input. Confirm the reading is within the controller's specified operating range (typically 230 V AC ±10% or 12/24 V DC depending on model).

3. Inspect the power supply wiring and connections

   Check that the L and N terminals at the controller are tight with no signs of arcing or corrosion. Loose connections cause intermittent dropouts that trigger repeated PF events.

4. Check the circuit breaker and electrical panel

   Inspect the breaker feeding the controller circuit. If it tripped, identify and eliminate the overload before resetting. Do not reset a breaker that trips immediately on re-energization.

5. Review HACCP records for temperature impact

   Check the controller's alarm history or HACCP log to determine how long power was absent and whether stored product temperatures reached unsafe levels during the outage.

When to call a professional

Engage a licensed electrician if the PF alarm recurs frequently without an obvious grid outage — repeated events indicate an unstable supply circuit or an internal wiring fault. If the outage was prolonged and food safety is a concern, a qualified food safety officer should assess whether stored product temperatures remained within acceptable HACCP limits before releasing product for consumption.