FAULT CODES
None
Fault Code Reference - Model 4701926
| Status | Description | Additional Information |
|---|---|---|
| F00 | Flow temperature sensor | NTC not plugged in or has come loose, multiple plug on PCB not plugged in correctly, interuption in cable harness, NTC sensor defective |
| F01 | Return temperature sensor | NTC plug not plugged in or has come loose, multiple plug on the PCB not plugged in correctly, interuption in cable harness, NTC sensor defective |
| F10 | Short circuit: Flow temperature sensor | NTC sensor defective, short circuit in the cable harness, cable / casing |
| F11 | Short circuit: Return temperature sensor | NTC sensor defective, short circuit in the cable harness, cable / casing |
| F12 | Short circuit: cylinder temperature sensor | Not applicable to this appliance |
| F13 | Short circuit: Domestic hot water cylinder temperature sensor | Not applicable to this appliance |
| F20 | Safety switch off: Overheating temperature sensor | Incorrect earth connection between cable harness and product, flow or return NTC defective (loose connection), black discharge via ignition cable, ignition plug or ignition electrode |
| F22 | Safety switch off: Low water pressure in the boiler | No or insufficient waterin the product, product water pressure sensor defective, cable to the pump or or to the water pressure sensor loose / not connected / defective |
| F23 | Safety switch off: Temperature difference too great (NTC1 / NTC2) | Pump blocked, insufficient pump output, air in product, flow and return NTC sensors connected the wrong way round |
| F24 | Safety switch off: Temperature rise too fast | Pump blocked, insufficient pump output, air in product, system pressure too low, non return valve blocked / incorrectly installed |
| F25 | Safety switch off: Flue gas temperature too high | Not applicable to this appliance |
| F27 | Safety switch off: Fault in flame detection | Moisture on the electronics, electronics (flame monitor) defective, gas solenoid valve leaking |
| F28 | Ignition unsuccessful when starting up | Gas meter defective or gas pressure monitor has triggered, air in gas, gas flow pressure too low, thermal isolator device (TAE) has triggered, incorrect gas restrictor, incorrect spare gas valve, fault on the gas valve, multiple plug on PCB incorrectly plugged in, break in cable harness, ignition system (ignition transformer, ignition cable, ignition plug, ignition electrode) defective,ionisation current interrupted (cable, electrode), incorrect earthing of product,electronics defective |
| F29 | Flame loss | Gas supply temporarily stopped, flue gas recirculation, incorrect earthing of product, ignition transformer has spark failure |
| F32 | Fan frost protection function active: Fan speed outside the tolerance values | Plug on fan not correctly plugged in, multiple plug on PCB not correctly plugged in, break in cable harness, fan blocked, Hall sensor defective, electronics defective |
| F33 | Fan frost protection function active: Air pressure switch fault | Not applicable to this appliance |
| F49 | eBUS fault: Voltage too low | Short circuit on eBUS, eBUS overload or two power supplies with different polarities on the eBUS |
| F61 | Gas valve control system | Short circuit/short to earth in cable harness for the gas valve, gas valve defective (coils shorted to earth), electronics defective |
| F62 | Gas valve switch-off control | Delayed switch-off of gas valve, delayed extinguishing of flame signal, gas valve leaking, electronics defective |
| F63 | EEPROM | Electronics defective |
| F64 | Electronics/sensor/analogue-to digital converter | Flow or return NTC short circuited, electronics defective |
| F65 | Electronics temperature too high | Electronics overheating due to external influences, electronics defective |
| F67 | Value sent back by ASIC is incorrect(flame signal) | Implausible flame signal, electronics defective |
| F68 | Unstable flame (analogue input) | Air in gas, gas flow pressure too low, incorrect air ratio, incorrect gas restrictor, ionisation flow interruption (cable, electrode) |
| F70 | Invalid product code (DSN) | Display and PCB replaced at same time and Device Specific Number not reset, wrong or missing output range coding resistance |
| F71 | Flow/return temperature sensor | Flow temperature sensor signalling constant value: Flow temperature sensor incorrectly positioned on supply pipe, flow temperature sensor defective |
| F72 | Deviation in the water pressure sensor/return temperature sensor | Flow/return NTC temperature difference too great - flow and/or return temperature sensor defective |
| F73 | Water pressure sensor not connected or has short-circuited | Interruption/short circuit of water pressure sensor, interruption/short circuit to GND in supply line to water pressure sensor or water pressure sensor defective |
| F74 | Electrical problem in the water pressure sensor | Line to water pressure sensor has a short circuit to 5 V/24 V or internal fault in the water pressure sensor |
| F75 | Pressure sensor | Pressure switch defective |
| F76 | The safety cut-out in the primary heat exchanger is defective | Not applicable to this appliance |
| F77 | Condensate or smoke | Not applicable to this appliance |
| F78 | Interruption to DHW outlet sensor at external controller | Not applicable to this appliance |
| F83 | Burner temperature sensor | Burner temperature sensor is defective, When the burner starts the temperature change registered at the flow or return sensor is non existent or too small, insufficient water in the product, the flow or return sensor is not correctly positioned on the pipe |
| F84 | Flow/return temperature sensor | Values not consistent, difference < -6 KB, Flow and return temperature sensors signalling implausible values: Flow and return temperature sensors have been inverted, flow and return temperature sensors have not been correctly installed |
| F85 | Temperature sensor | The flow and/or return temperature sensors have been installed on the same pipe/incorrect pipe, Temperature sensor not connected or is connected incorrectly |
| F86 | Underfloor heating contact | Underfloor heating contact open, sensor disconnected or defective |
| F87 | Electrodes | Electrodes not connected or they are connected incorrectly, short circuit in the cable harness |
| F88 | Gas valve | Gas valve not connected or it is connected incorrectly, short circuit in the cable harness |
| F89 | Pump | Pump not connected or it is connected incorrectly, incorrect pump connected, short circuit in the cable harness |
| F91 | Short circuit cylinder temperature sensor | Not applicable to this appliance |
| CON | No communication between the PCB and the user interface | Electronics defective |
| ERR | No communication between the PCB and the user interface | Electronics defective |
| F.-- | Display fault (may be flashing F. then -- and unresponsive / erratic) | Electronics defective |
| S0 | Heating mode: No requirement | |
| S01 | Heating mode: Advance fan operation | |
| S02 | Heating mode: Pump pre-run | |
| S03 | Heating mode: Burner ignition | |
| S04 | Heating mode: Burner on | |
| S05 | Heating mode: Pump/fan overrun | |
| S06 | Heating mode: Fan overrun | |
| S07 | Heating mode: Pump overrun | |
| S08 | Heating mode: Temporary shutdown after heating procedure | |
| S10 | Hot water handling mode: Requirement | |
| S11 | Hot water handling mode: Advance fan operation | |
| S13 | Hot water handling mode: Burner ignition | |
| S14 | DHW mode: Burner on | |
| S15 | DHW mode: Pump/fan overrun | |
| S16 | DHW mode: Fan overrun | |
| S17 | DHW mode: Pump overrun | |
| S20 | Hot water handling mode: Requirement | |
| S21 | Hot water handling mode: Advance fan operation | |
| S22 | Hot water handling mode: Pump pre-run | |
| S23 | Hot water handling mode: Burner ignition | |
| S24 | DHW mode: Burner on | |
| S25 | DHW mode: Pump/fan overrun | |
| S26 | NDHW mode: Fan overrun | |
| S27 | DHW mode: Pump overrun | |
| S28 | Hot water handling mode: Temporary shutdown of the burner | |
| S30 | Room thermostat is blocking heating mode | |
| S31 | No heating demand: Summer mode, eBUS controller, waiting period | |
| S32 | Fan waiting time: Fan speed outside of the tolerance values | |
| S33 | Forced fan operation until the pressure monitor is switched | |
| S34 | Frost protection active | |
| S39 | Underfloor heating contact open | |
| S41 | Water pressure too high | |
| S42 | Flue non-return flap closed | |
| S46 | Frost protection mode (Comfort): Minimum load | |
| S53 | Product in waiting period/operation block function due to low water pressure (flow/return spread too large) | |
| S54 | Waiting period: Low water pressure in the circuit (flow/return spread too large) | |
| S76 | Maintenance message: Check the water pressure | |
| S88 | Product purging active | |
| S91 | Maintenance: Demo mode | |
| S96 | Automatic test programme: Return temperature sensor, heating demands blocked | |
| S97 | Automatic test programme: Water pressure sensor, heating demands blocked | |
| S98 | Automatic test programme: Return temperature sensor, heating demands blocked | |
| S99 | Internal automatic test programmes | |
| S108 | Purging the combustion chamber, fan in operation | |
| S109 | Product's standby mode activated |