Error code
Filter replacement alarm Filter replacement or cleaning required
Applies to 3 models
RXC35, RXC50, RXC65
What this means
The air filter needs cleaning or replacement.
What you can check yourself
- Turn off the heat pump at its main switch.
- Vacuum-clean the filter at least every three months or replace it annually.
- Reset the alarm on the display and restart the heat pump.
Still not resolved? Contact a qualified installer or servicer.
See the official ComfortZone 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 Filter replacement alarm.