Error code
52 Temperature-limiter alarm
Applies to 1 model
F370
What this means
The temperature limiter has triggered. The alarm is stored with operating data in the alarm log and requires investigation if it does not clear.
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 official NIBE manualA deep link to the manufacturer's own PDF for full technical detail. We link to manuals, we never host them.
Using Claude Code or Meta Muse? Connect HeatPump AI and ask it about 52.