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The boiler locks out due to an abnormal flame detection. These are the most likely causes and the safe inspection.
The ABM03 control unit is usually behind this blockage. This is how it is interpreted and how a real fault is distinguished from an electrical failure.
The boiler is blocked due to an incorrect reading in the flow probe. These are its causes, signs, and diagnosis.
A malfunction in the DHW sensor can leave the boiler without hot water. Here is how to identify it and address it properly.
The warning points to the control electronics and usually requires a technical inspection to restore normal operation.
The CC notice points to the external probe and its wiring. These are the useful checks and when it is advisable to replace the part.
The fault locks the boiler due to a problem in the air reading. This is how it is interpreted and diagnosed without making it worse.
The panel freezes, stops responding, and a single correct press is enough to recover it.
Clear steps to regain control of the panel, understand the lockout, and avoid common mistakes.
The screen indicates an internal mismatch. A restart may clear it, but if it reappears, it usually points to the board.
The warning usually indicates an abnormal reading or overflow. That is how it restarts properly and when it stops being a simple blockage.
The notice points to the touch panel or its connection to the board. These checks help narrow down the fault without wasting time.