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Sime
Fault Codes
Listed below are the common Sime fault codes as described by the boiler manufacturer along with a possible cause.
| AL 02 Low water pressure in system |
| Restore pressure |
| Check for any leaks in the system |
| AL 03 High water pressure in system |
| Empty the system via the drain valve on the |
| Hydraulic assembly and bring the pressure to approximately 1.2 bar |
| AL 04 Domestic hot water sensor (SS) fault |
| Check connections |
| Replace the sensor |
| AL 05 Delivery sensor (SM) fault |
| Check connections |
| Replace the sensor |
| AL 06 No flame detection |
| Check the integrity of the electrode and |
| Check that it is not grounded |
| Check gas availability and pressure |
| Check the operation of the gas valve |
| AL 07 Safety thermostat (TS) intervention |
| Check the sensor or thermostat connections |
| Deaerate the system |
| Check the bleed valve |
| Replace the sensor or the thermostat |
| Check that the pump impeller is not blocked |
| AL 08 Fault in the flame detection circuit |
| Check the integrity of the electrode and check that it is not grounded |
| Check gas availability and pressure |
| Check the operation of the gas valve |
| AL 09 No water circulating in the system |
| Check the rotation of the system pump impeller |
| Check the electrical connections |
| Replace the pump |
| AL 10 Auxiliary sensor fault |
| Check the hydraulic configuration in the boiler |
| Check the electrical connection |
| AL 11 Gas valve modulator disconnected |
| Check the electrical connection |
| AL 12 Incorrect configuration of the open / sealed chamber |
| Set the parameter tS 0.4 (Combustion configuration) to 0 |
| AL 13 Exhaust sensor (SF) intervention |
| Replace the smoke probe |
| Contact the Technical Assistance Centre |
| AL 14 Exhaust sensor (SF) fault |
| Replace the smoke probe |
| Check the electrical connection of the smoke probe, if the problem is not resolved, contact the Assistance Centre |
| AL 15 Fan check cable disconnected |
| Check the connection cable between the fan and the board |
| AL 18 Condensate level fault |
| Check for any clogging in the pipe which takes the condensate to the siphon |
| Check that the siphon is not clogged |
| AL 28 Maximum number of consecutive resets reached (6) |
| Contact the Technical Assistance Centre AL 37 Fault due to low network voltage. |
| Check with tester |
| Contact network provider (ENEL) |
| AL 40 Incorrect supply frequency detected |
| Contact network provider (ENEL) |
| AL 41 Flame loss more than 6 consecutive times |
| Check the detection electrode |
| Check the gas supply (open valve) |
| Check mains gas pressure |
| AL 42 Button fault |
| Check that buttons are working |
| AL 43 Open Therm communication fault |
| Check the electrical connection of the remote control |
| AL 62 Self-calibrating procedure is required |
| Carry out the self calibrating procedure (see the specific section) |
| AL 72 Incorrect positioning of the delivery sensor |
| Check that the delivery sensor is attached to the delivery pipe |
| AL 81 Block due to combustion during start-up |
| Check for blockage in flue |
| Bleed the air from the gas circuit |
| AL 83 Irregular combustion (temporary error) |
| Check for blockage in flue |
| AL 96 Lockout due to flue (exhaust) blockage |
| Check for blockage in flue |
| Additional Functioning Faults |
| Frequent relief valve intervention |
| Check circuit pressure |
| Check expansion vessel |
| Limited production of domestic hot water |
| Check the diverter valve |
| Check that plate heat exchanger is clean |
| Check domestic hot water circuit valve |
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