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A blockage between electronic boards leaves the boiler out of service and requires a precise technical reading.
A lockout due to repeated resets requires a quick inspection of the boiler before attempting more restarts.
The fault cuts off domestic hot water and indicates a short circuit in the TAS system.
The fault cuts off the hot water and leaves the accumulator unprotected. This is how the failure works and what to check.
Fault D99 indicates an incompatibility between control modules and requires specialized technical review.
The fault indicates the sensor of accumulator 2 and affects the hot water. This is how it is interpreted and why it usually requires a technician.
The boiler locks out due to an abnormal thermal reading: causes, signs, and safe checks.
The fault usually points to the internal electronics and requires specialized technical inspection to avoid further damage.
The boiler detects an abnormally low outlet temperature: causes, safe checks, and technical notice.
The boiler goes into alarm due to overheating. Here is the most likely cause and the safe response.
The warning indicates a shorted return probe. That is how it is interpreted, what to check, and when to intervene.
Error L07 points to the return probe and is usually due to a bad connection or a defective part.