15.7 Operating faults F
15.7 Operating faults F The boiler is protected against the risk of breakdown by internal checks carried out by the microprocessor which, if necessary, will activate a safety shutdown. If the appliance stops working, the screen will display a code corresponding to the type of stoppage and its cause. There are two types of stoppage: - SAFETY SHUTDOWN: this type of fault (indicated on the display by the letters "E" or "S" ) is of the "VOLATILE" type, in other words it is automatically cleared when its cause ceases. As soon as the cause of the stoppage disappears, the appliance will restart and resume normal operation. While the boiler is in safety shutdown mode, it is possible to attempt to restore operation by switching it off and then on again. - OPERATING STOPPAGE: this type of fault is called "NON VOLATILE" (indicated on the display by the letter "A" ) and in this case, the appliance does not automatically restart. To reset the boiler, press the RESET key 27. If, after several attempts to reset, the appliance stops again, call a qualified technician. The following is a list of the stoppage types and the corresponding codes displayed on the screen. Display A01 A03 A07 A17 A18 A33 A97 A98 A99 CAUSE Three ignition attempts The output temperature exceeds 105°C during operation Too many flame separations over a period during operation Input water circulation fault No water circulation Fan problem Electronic control problem Electronic control problem Electronic control problem N.B.: In the case of an ignition fault, check that the gas tap is open. IMPORTANT If this type of failure occurs too often, call an approved after sales technical service. For safety reasons, the boiler will only allow 5 reignition attempts in 15 minutes (pressing of the RESET button). After the fifth attempt, the boiler goes into safety shutdown mode E 99. No problem in the case of sporadic or isolated stoppages. 44
Display S 01 S 02 S 04 S 05 S 06 S 25 S 26 S 27 S 30 S 31 S 80 CAUSE Flame not detected on first attempt Flame not detected on second attempt Open circuit on Domestic hot water sensor Short circuit on Domestic hot water sensor Flame separation Tank sensor open Tank sensor short circuit Tank overheating External sensor open circuit External sensor short circuit Open circuit or short circuit on room sensor of the Clima Manager remote control Display E 02 E 06 E 07 E 08 E 09 E 10 E 20 E 94 E 95 E 99 CAUSE Insufficient water pressure Open circuit on heating outlet sensor Short circuit on heating outlet sensor Open circuit on heating return sensor Short circuit on heating return sensor Contact open in the floor overheat safety device circuit (Flora room thermostat) False flame detection with gas valve closed Electronic control problem Read error in heating outlet and return sensors 5 resets in less than 15 minutes. Resetting by a boiler ON/OFF operation Antilocking of pump and three-way valve To prevent locking of the components, the appliance performs a self-test every 24 hours: the pump starts up for 3 seconds and the diverting valve is operated. Frost protection The boiler is fitted with an anti-freeze device, which checks the heating outlet temperature of the boiler: if this temperature falls below 8°C, the pump starts up (circulation within the heating appliance) and runs for 2 minutes. After two minutes' circulation, the microprocessor carries out the following check: a - if the outlet temperature is > 8°C, the pump stops; b - if the outlet temperature is > 3°C and < 8°C the pump continues for a further 2 minutes; c - if the outlet temperature is < 3°C, the burner is ignited (in heating mode at minimum power) until a temperature of 33°C is reached. Once this temperature is reached, the burner switches off and the circulation pump continues to operate for a further two minutes. It is possible to cause the pump to operate continuously using parameter P in the settings menu (see menu table). The antifreeze protection is only activated if the boiler is in perfect working order, in other words: - the appliance water pressure is sufficient; - the boiler is receiving an electrical supply; - gas is being supplied. 45
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