Faults of Saunier Duval Semia Condens 25-A and 30-A
Identify the code and check the version of your boiler.
Models and version of the manual
25-A and 30-A. The existing guide is expanded to include 30-A, explicitly mentioned in the same manual. The complete boiler linked in this guide is the 30-A. The mention of spare parts for 25-A does not confirm their compatibility with 30-A. The manufacturer's match does not authorize the use of this table for any Saunier Duval.
Consulted edition: 0020199140_06 · 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.
- F.22
Safety shutdown: lack of water in the boiler
- F.28
Fault: unsuccessful ignition on start-up
- F.29
Fault: flame loss
- F.83
Fault: Dry fire
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.
Components of Saunier Duval Semia Condens 25-A and 30-A 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? |
|---|---|
| F.00 | Fault: flow temperature sensor |
| F.01 | Fault: return temperature sensor |
| F.10 | Short circuit: supply temperature sensor |
| F.11 | Short circuit: return temperature sensor |
| F.13 | Short circuit: domestic hot water accumulator temperature sensor |
| F.20 | Safety shutdown: overheating temperature reached |
| F.22 | Safety shutdown: lack of water in the boiler |
| F.23 | Safety shutdown: temperature variation too large (NTC1/NTC2) |
| F.24 | Safety shutdown: temperature rise too fast |
| F.25 | Safety disconnection: flue gas temperature very high |
| F.27 | Safety disconnection: flame detection error |
| F.28 | Fault: unsuccessful ignition on start-up |
| F.29 | Fault: flame loss |
| F.32 | Frost protection function of the fan activated: the fan speed exceeds the tolerance values. |
| F.49 | eBUS error: current too low |
| F.61 | Error: gas valve control |
| F.62 | Error: gas valve disconnection controller |
| F.63 | Error: EEPROM |
| F.64 | Fault: PCB / sensor / analog to digital transformer |
| F.65 | Error: electronics temperature too high |
| F.67 | Incorrect return value from ASIC (flame signal) |
| F.68 | Error: unstable flame (analog input) |
| F.70 | Invalid product code (DSN) |
| F.71 | Fault: supply/return temperature sensor |
| F.72 | Error: deviation of the water pressure sensor/return temperature sensor |
| F.73 | Error: water pressure sensor not connected or short-circuited |
| F.74 | Error: electrical problem with the water pressure sensor |
| F.75 | Fault: pressure sensor |
| F.77 | Fault: condensate or smoke |
| F.78 | Interruption of the domestic hot water outlet sensor in the external controller |
| F.83 | Fault: Dry fire |
| F.84 | Fault: supply/return temperature sensor |
| F.85 | Fault: temperature sensor |
| F.86 | Fault: underfloor heating contact |
| F.87 | Fault: ignition electrode |
| F.88 | Fault: gas valve assembly |
| F.89 | Error: pump |
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.
Documentation and other guides
Consult fault guides by brand and model. · Return to the blog