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FA1 Tripped

Miniature Circuit-breaker (FA1) Tripped — Internal electrical components are protected

NIBE · F750 Heat Pump

What does FA1 Tripped mean?

The internal miniature circuit-breaker (FA1) has tripped, which protects components like the fan and circulation pumps. This can happen due to an electrical overload or a fault within the heat pump. It may also have tripped during transportation.

Common Causes

  • Electrical overload on internal circuits
  • Internal fault in the fan or circulation pump
  • Tripped during transportation or initial installation

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Cut the main current to the heat pump at the circuit breaker for safety.

  2. 2

    Locate the miniature circuit-breaker (FA1) inside the heat pump (consult diagram if unsure).

  3. 3

    Reset the circuit-breaker by flipping its switch to the 'ON' position.

  4. 4

    Restore power to the heat pump at the main circuit breaker.

  5. 5

    If the breaker trips again immediately, contact a qualified electrician for further diagnosis.

Browse all codes in this manual (18)
Verified technical data. Last updated: April 2026

Related Faults

Additional heat blocked symbolAdditional heat blocked symbol displayed — Additional heat is not availableAlarm persists after resetRed status lamp and 'alarm' menu remain after reset — Problem not resolvedBoiler Dry Start DamageDamaged Components — Temperature limiter, thermostat, or immersion heater damaged
Source: NIBE F750 Heat Pump
Open Manual (Page 23)Search more codes in this manual