Ferroli F09: Return temperature overheat protection

What does this error code mean?

Return temperature overheat protection. Applicability is limited to the manufacturer-documented model / series, not all devices of this brand.

Steps to take

1. 1. Record error F09 and the complete model plate. This description only applies to BLUEHELIX TECH RRT 24 H.
2. 2. If you smell gas or flue fumes, or a carbon monoxide alarm sounds, avoid switches and controls; leave the area and call emergency assistance from outside.
3. 3. The manufacturer describes this code as “return temperature overheat protection”. Do not open the casing or remove any components to investigate.
4. 4. Record displayed pressure and temperature. Pump, circulation, venting and exchanger work belongs to qualified service.
5. 5. If F09 remains, share the model and symptoms with authorized service for qualified diagnosis.

Which products does this apply to?

BLUEHELIX TECH RRT 24 H

Codes and hardware can vary by model, production year and market.

What must a qualified technician assess?

All gas and electrical repairs require qualified service.

Verification after service

After professional checks, confirm that the error no longer returns during normal use. Report any repeat warning to service.

Manufacturer reference

Documented page: 191–192.