| Statuscode | Link | Status | Meaning | Applicable to |
|---|---|---|---|---|
| S.00 | Heating: No heat de- mand | Heating has no heat demand. The burner is off. | Heating mode (all models) | |
| S.01 | Heating mode: Fan start- up | The fan start-up for heating mode is activated. | Heating mode (all models) | |
| S.02 | Heating mode: Pump pre-run | The pump prerun for heating mode is activated. | Heating mode (all models) | |
| S.03 | Heating mode: Ignition | The ignition for heating mode is activated. | Heating mode (all models) | |
| S.04 | Heating mode: Burner on | The burner for heating mode is activated. | Heating mode (all models) | |
| S.05 | Heating mode: Pump/fan overrun | The pump/fan overrun for heating mode is activated. | Heating mode (all models) | |
| S.06 | Heating mode: Fan over- run | The fan overrun for heating mode is activated. | Heating mode (all models) | |
| S.07 | Heating mode: Pump overrun | The pump overrun for heating mode is activated. | Heating mode (all models) | |
| S.08 | Heating mode: Anti-cyc- ling time | The anti-cycling time for heating mode is activated. | Heating mode (all models) | |
| S.10 | DHW demand | The domestic hot water demand is activated. | Domestic hot water mode (ecotec combination boilers only) | |
| S.11 | DHW mode: Fan start-up | The fan start-up for domestic hot water mode is activated. | Domestic hot water mode (ecotec combination boilers only) | |
| S.13 | DHW mode: Ignition | The ignition for domestic hot water mode is activated. | Domestic hot water mode (ecotec combination boilers only) | |
| S.14 | DHW mode: Burner on | The burner for domestic hot water mode is activated. | Domestic hot water mode (ecotec combination boilers only) | |
| S.15 | DHW mode: Pump/fan overrun | The pump/fan overrun for domestic hot water mode is activated. | Domestic hot water mode (ecotec combination boilers only) | |
| S.16 | DHW mode: Fan overrun | The fan overrun for domestic hot water mode is activated. | Domestic hot water mode (ecotec combination boilers only) | |
| S.17 | DHW mode: Pump over- run | The pump overrun for domestic hot water mode is activated. | Domestic hot water mode (ecotec combination boilers only) | |
| S.20 | DHW demand | The domestic hot water demand is activated. | Warm start (ecotec combination boilers only) / Charge hot water cylinder (ecotec systems boilers only) | |
| S.21 | DHW mode: Fan start-up | The fan start-up for domestic hot water mode is activated. | Warm start (ecotec combination boilers only) / Charge hot water cylinder (ecotec systems boilers only) | |
| S.22 | DHW mode: Pump pre- run | The pump prerun for domestic hot water mode is activated. | Warm start (ecotec combination boilers only) / Charge hot water cylinder (ecotec systems boilers only) | |
| S.23 | DHW mode: Ignition Burner on | The ignition for domestic hot water mode is activated. | Warm start (ecotec combination boilers only) / Charge hot water cylinder (ecotec systems boilers only) | |
| S.24 | DHW mode: | The burner for domestic hot water mode is activated. | Warm start (ecotec combination boilers only) / Charge hot water cylinder (ecotec systems boilers only) | |
| S.25 | DHW mode: Pump/fan overrun | The pump/fan overrun for domestic hot water mode is activated. | Warm start (ecotec combination boilers only) / Charge hot water cylinder (ecotec systems boilers only) | |
| S.26 | DHW mode: Fan overrun | The fan overrun for domestic hot water mode is activated. | Warm start (ecotec combination boilers only) / Charge hot water cylinder (ecotec systems boilers only) | |
| S.27 | DHW mode: Pump over- run | The pump overrun for domestic hot water mode is activated. | Warm start (ecotec combination boilers only) / Charge hot water cylinder (ecotec systems boilers only) | |
| S.28 | DHW anti-cycling time | The anti-cycling time for domestic hot water mode is activated. | Warm start (ecotec combination boilers only) / Charge hot water cylinder (ecotec systems boilers only) | |
| S.30 | No heat demand: Con- troller | Room thermostat blocks heating mode. | All boilers | |
| S.31 | No heat demand: Sum- mer mode | Summer mode is activated; there is no heat demand. | All boilers | |
| S.32 | Waiting time deviation: Fan speed | The waiting period for the fan start-up is activated. | All boilers | |
| S.34 | Heating mode: Frost pro- tection | The frost protection function for heating mode is activated. | All boilers | |
| S.39 | Contact thermostat triggered | The surface-mounted thermostat or the condensate pump has triggered. | All boilers | |
| S.40 | Comfort protection act- ive | The comfort protection mode is activated. | All boilers | |
| S.41 | Water pressure too high | The system pressure is too high. | All boilers | |
| S.42 | Flue non-return flap closed | Flue non-return flap return signal blocks burner operation (only in conjunction with the multi-functional module) or condensate pump defective, heat demand is blocked. | All boilers | |
| S.46 | Comfort protection: Min- imum load, loss of flame | Comfort protection mode for flame loss at minimum load is activated. | All boilers | |
| S.53 | Waiting time: Water shortage | The product is within the waiting period of the modulation block/operating block function as a result of a water deficiency (flow/return spread too large). | All boilers | |
| S.54 | Waiting time: Water shortage | Product is in the waiting period of the operation blocking function as a result of low water pressure (temperature gradient). | All boilers | |
| S.57 | Waiting time: Measuring program | The product is within the waiting period as a result of the measuring programme. | All boilers | |
| S.58 | Burner modulation limit- ation | The burner modulation limitation is activated. | All boilers | |
| S.61 | Fault: Incorrect gas type | The coding resistor on the PCB does not match the entered gas group (see also F.92) | All boilers | |
| S.62 | Adjust CO2 | Set the CO2 content. | All boilers | |
| S.63 | Fault: Check gas route | A fault message is activated. Check the gas route. | All boilers | |
| S.76 | Service message: Check water pressure | A service message is activated. Check the water pressure. | All boilers | |
| S.88 | Purging programme is running | The purge programme is activated. | All boilers | |
| S.92 | Water circulation volume self-test | The self-test for the water circulation volume is activated. | All boilers | |
| S.93 | Flue gas measurement not possible | Flue gas analysis is not currently possible. | All boilers | |
| S.96 | Return temperature sensor self-test | The self-test for the return temperature sensor is activated. | All boilers | |
| S.97 | Water pressure sensor self-test | The self-test for the water pressure sensor is activated. | All boilers | |
| S.98 | Flow/return temperature sensor self-test | The self-test for the flow/return temperature sensor is activated. | All boilers | |
| S.99 | Vaillant self-test | The Vaillant self-test is activated. | All boilers |
Vaillant S Codes New
Information is guidance only; repairs require qualified professionals. Affiliate links may earn us commissions at no extra cost. Do your own due diligence; we accept no liability.