Furnace does not start at all, display blank or unresponsive

Safety: Only qualified persons should open electrical panels. Always verify power is off before touching wiring.

• Check household breakers: Verify that the circuit breaker feeding the Nibe furnace is on and has not tripped. Reset if necessary.
• Inspect external isolator: Ensure any local isolator switch near the unit is in the ON position.
• Look for display signs: If the display remains dead, an internal fuse may have blown. This should be checked and replaced only by a technician.

If power supply is confirmed but the unit remains dead, the main control PCB or power supply module likely needs professional diagnosis and replacement.