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The boiler indicates reversed flow and return; here is the most common cause and the correct response.
The boiler goes into lockout due to repeated flame loss. These are the real cause, the basic check, and when to call the technician.
An internal communication failure blocks the boiler and usually requires technical inspection to prevent greater damage.
The L38 warning indicates an internal communication problem between boards and requires a careful technical review.
The alarm usually indicates a brief disconnection or an incorrect setting in the control input.
The notice indicates a failed test of the HRU-URC unit and usually requires technical review.
The boiler indicates a scheduled maintenance check: what it means, how to reset it, and when it’s advisable to call a technician.
The boiler indicates a scheduled inspection, and it should be addressed promptly to avoid unnecessary downtime.
The alert indicates a scheduled inspection and it should be addressed without delay to keep the boiler in compliance.
The boiler indicates a pending inspection, and it is advisable to address it without delay to avoid shutdowns and performance losses.
The M20 warning usually corresponds to an automatic purge or internal drying and normally disappears by itself within minutes.
The notice indicates a MODBUS communication problem in the control system and requires specialized technical review.