Short answer
Ferroli Bluehelix Hitech RRT 45 H faults
Identify the code and check the version of your boiler.
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.
Ferroli Bluehelix Hitech RRT 45 H components Manufacturer's diagram
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 it indicate? |
|---|---|
| A01 | The burner does not ignite |
| A02 | Flame signal present with burner off |
| F05 | Fan fault |
| A06 | No flame after the ignition phase |
| A08 | Overtemperature protection operation |
| A09 | Intervention protection heat exchanger |
| F09 | Overtemperature protection operation |
| F10 | Return sensor anomaly |
| A11 | Gas valve connection |
| F11 | Return sensor anomaly |
| F12 | Domestic hot water sensor anomaly |
| F13 | Flue sensor anomaly |
| A14 | Operation of the flue gas safety device |
| F15 – A07 | High flue gas temperature |
| F19 | Anomaly in the parameters of the control board |
| F21 | Installation pressure slightly high (visible only in the Alarm menu) |
| A23-A24-F51 | Pressure sensor anomaly |
| A26 | The F40 anomaly occurs more than 3 times in 24 hours. |
| F34 | Supply voltage below 180 V |
| F35 | Incorrect power supply frequency |
| F37 | Incorrect water pressure in the system |
| F39 | Outdoor sensor anomaly |
| F40 | Pressure sensor anomaly |
| A44 | Error due to multiple demands |
| F47 | Pressure transducer communication failure |
| F50 – F53 | Limit thermostat anomaly with parameter b06 = 1 or 4 |
| F62 | Calibration request |
| F64 | Exceeded the maximum number of consecutive resets |
| A65 – A97 | Specific combustion control faults |
| F65 – F98 | Specific combustion control faults |
| A80 | False flame signal after the gas valve closure |
| A88 | Specific faults related to combustion control or the gas valve |
| F96 | Specific combustion flame errors |
| A98 | Too many SW errors or error appeared due to card replacement |
| A99 | Generic fault |
| F99 | Communication anomaly between the display and the control unit |
No matches found. Please check the code and the version of the equipment.
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.
Does the warning still appear on your Ferroli boiler? Consult the Ferroli boiler technical service in Madrid or the spare parts and assistance for Ferroli.
Documentation and other guides
Consult fault guides by brand and model. · Return to the blog