Identify the warning, do not guess the part.
If you Ferroli Bluehelix Hitech RRT 45 H show a code, copy the complete message and check the model. Here you will find the warnings from its manual and what information to provide for a review. A code guides: it does not confirm by itself which spare part is needed.
Models and version of the manual
45 H. The H manual is used, which documentation expressly includes 45 H. The domestic hot water alerts depend on the connected equipment; they do not necessarily describe a part incorporated in the boiler.
Consulted edition: 3541V487 · Rev. 00 · 06/2025 · Spanish section · manufacturer's manualThe control options, accessories, and versions may limit which notifications appear in each installation.
Locate the code on your screen.
These accesses lead to their entry in the table. They are not a classification of the most common faults: the manual does not provide incidence statistics.
- A01
The burner does not ignite
- F37
Incorrect water pressure in the system
- F47
Pressure transducer communication failure
- F99
Communication anomaly between the display and the control unit
What to do without opening the boiler
- Note what you see.
Complete code, message, and pressure displayed by the equipment. Indicate whether it occurs when opening hot water, requesting heating, or in both cases.
- Identify the device.
Take a photo of the screen and the identification accessible without disassembling anything. Brand, model, and version help avoid confusing tables from different ranges.
- Describe how it started.
Determine whether the fault is continuous or intermittent and if there was a supply interruption or a recent intervention. If it reappears after a reset allowed by the user manual, do not chain resets.
Do not open the casing or manipulate gas, wiring, combustion, or flue gas outlet. If you smell gas, avoid flames and switches, leave the area, and notify the distributor's emergency service from a safe location; in case of immediate danger, call 112.
Documented codes table
The meaning of the warning is provided, not the repair operations reserved for qualified personnel. When the manufacturer groups several codes, the grouping is maintained; it is not interpreted as a range of numbers.
| Code | What does · source indicate? |
|---|---|
| A01 | The burner does not ignite PDF |
| A02 | Flame signal present with burner off PDF |
| F05 | Fan fault PDF |
| A06 | No flame after the ignition phase PDF |
| A08 | Overtemperature protection operation PDF |
| A09 | Intervention protection heat exchanger PDF |
| F09 | Overtemperature protection operation PDF |
| F10 | Return sensor anomaly PDF |
| A11 | Gas valve connection PDF |
| F11 | Return sensor anomaly PDF |
| F12 | Domestic hot water sensor anomaly PDF |
| F13 | Flue sensor anomaly PDF |
| A14 | Operation of the flue gas safety device PDF |
| F15 – A07 | High flue gas temperature PDF |
| F19 | Anomaly in the parameters of the control board PDF |
| F21 | Installation pressure slightly high (visible only in the Alarm menu) PDF |
| A23-A24-F51 | Pressure sensor anomaly PDF |
| A26 | The F40 anomaly occurs more than 3 times in 24 hours. PDF |
| F34 | Supply voltage below 180 V PDF |
| F35 | Incorrect power supply frequency PDF |
| F37 | Incorrect water pressure in the system PDF |
| F39 | Outdoor sensor anomaly PDF |
| F40 | Pressure sensor anomaly PDF |
| A44 | Error due to multiple demands PDF |
| F47 | Pressure transducer communication failure PDF |
| F50 – F53 | Limit thermostat anomaly with parameter b06 = 1 or 4 PDF |
| F62 | Calibration request PDF |
| F64 | Exceeded the maximum number of consecutive resets PDF |
| A65 – A97 | Specific combustion control faults PDF |
| F65 – F98 | Specific combustion control faults PDF |
| A80 | False flame signal after the gas valve closure PDF |
| A88 | Specific faults related to combustion control or the gas valve PDF |
| F96 | Specific combustion flame errors PDF |
| A98 | Too many SW errors or error appeared due to card replacement PDF |
| A99 | Generic fault PDF |
| F99 | Communication anomaly between the display and the control unit PDF |
Is there a problem, but no fault code appears?
The absence of a warning does not rule out a fault. For a boiler that does not heat, does not deliver hot water, loses pressure, or operates intermittently, describe the symptom and the moment it occurs. Do not assume that the PCB, the pump, or a sensor is faulty without checking the equipment and the installation.
Request a review of the boiler. · Consult maintenance
Before requesting a repair
Does the code identify the spare part I need to buy?
No. A single warning can have multiple causes. The spare part reference requires identifying the appliance and confirming the fault; the code or a generic photograph is not sufficient.
Can it be reset again if the fault returns?
It is not advisable to chain resets. Follow only what is outlined for the user in your version's manual. A persistent or recurring lockout requires inspection.
When does it make sense to compare a new boiler?
When you have a diagnosis and a budget, compare repair, availability of the spare part, and replacement according to your installation. An isolated fault code does not justify changing the equipment.
Models of this guide in the catalog
See new boilers · Consult installation or replacement
The technical sheet of each product provides information on its price and availability. Installation is quoted separately depending on the case.
Documentation and other guides
Official manual for Ferroli Bluehelix Hitech RRT 45 H · 3541V487 · Rev. 00 · 06/2025 · Spanish section. The page references in the table correspond to the PDF viewer, whose numbering may differ from the printed version.
Consult fault guides by brand and model. · Return to the blog