Identify the warning, do not guess the part.
If you Hermann Micraplus Condens 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
25-A and 30-A. Micraplus Condens 25-A and 30-A H-ES manual. The MicraCom table is not reused.
Consulted edition: 0020200875_04 · 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.
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? |
|---|---|
| F.00 | Fault: flow temperature sensor PDF |
| F.01 | Fault: return temperature sensor PDF |
| F.10 | Short circuit: supply temperature sensor PDF |
| F.11 | Short circuit: return temperature sensor PDF |
| F.12 | and F.91 PDF |
| F.13 | Short circuit: domestic hot water accumulator temperature sensor PDF |
| F.20 | Safety shutdown: overheating temperature reached PDF |
| F.22 | Safety shutdown: lack of water in the boiler PDF |
| F.23 | Safety shutdown: temperature variation too large (NTC1/NTC2) PDF |
| F.24 | Safety shutdown: temperature rise too fast PDF |
| F.25 | Safety disconnection: flue gas temperature very high PDF |
| F.27 | Safety disconnection: flame detection error PDF |
| F.28 | Fault: unsuccessful ignition on start-up PDF |
| F.29 | Fault: flame loss PDF |
| F.32 | Frost protection function of the fan activated: the fan speed exceeds the tolerance values. PDF |
| F.49 | eBUS error: current too low PDF |
| F.61 | Error: gas valve control PDF |
| F.62 | Error: gas valve disconnection controller PDF |
| F.63 | Error: EEPROM PDF |
| F.64 | Fault: PCB / sensor / analog to digital transformer PDF |
| F.65 | Error: electronics temperature too high PDF |
| F.67 | Incorrect return value from ASIC (flame signal) PDF |
| F.68 | Error: unstable flame (analog input) PDF |
| F.70 | Invalid product code (DSN) PDF |
| F.71 | Fault: supply/return temperature sensor PDF |
| F.72 | Error: deviation of the water pressure sensor/return temperature sensor PDF |
| F.73 | Error: water pressure sensor not connected or short-circuited PDF |
| F.74 | Error: electrical problem with the water pressure sensor PDF |
| F.75 | Fault: pressure sensor PDF |
| F.76 | Safety temperature limiter in primary heat exchanger faulty PDF |
| F.77 | Fault: condensate or smoke PDF |
| F.78 | Interruption of the domestic hot water outlet sensor in the external controller PDF |
| F.83 | Fault: Dry fire PDF |
| F.84 | Fault: supply/return temperature sensor PDF |
| F.85 | Fault: temperature sensor PDF |
| F.86 | Fault: underfloor heating contact PDF |
| F.87 | Fault: electrodes PDF |
| F.88 | Fault: gas valve assembly PDF |
| F.89 | Error: pump 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 of Hermann Micraplus Condens · 0020200875_04. 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