Error code
82 Sub-cool heat-exchanger temperature sensor fault
How it shows on the unit OPERATION 8 blinks, TIMER 2 blinks (each 0.5 s on/0.5 s off) while ECONOMY flashes rapidly (0.1 s on/0.1 s off)
Applies to 2 models
What this means
A sub-cool heat-exchanger gas inlet or outlet temperature sensor has a fault.
When to call a technician
This fault involves refrigerant, pressure, or electrical work that must be handled by a certified technician under EU F-gas rules. Do not attempt to open the refrigerant circuit, access mains wiring, or adjust pressure components yourself. Contact a qualified installer or servicer for this one.
See the Fujitsu manual (hosted by an authorized distributor)Hosted by an authorized distributor rather than by the manufacturer. We link to manuals, we never host them.
Using Claude Code or Meta Muse? Connect HeatPump AI and ask it about 82.