Error code
Hög GT3:3 High GT3:3 temperature
How it shows on the unit Flashing red alarm lamp while alarm is active
Applies to 2 models
IVT 490, IVT 495 TWIN
What this means
The temperature in the outer part of the hot-water tank is too high, or air may be present in the tank jacket, especially during initial operation.
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 IVT 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 Hög GT3:3.