Vaillant ecoTEC Pro 28 Combi

F.00 Interruption: Flow sensor F.01 Interruption: Return sensor F.10 Short circuit: Flow sensor F.11 Short circuit: Return sensor F.20 Safety switch-off: Temperature limiter F.22 Safety switch-off: Low water pressure F.23 Safety switch-off: Temp.spread too large F.24 Safety switch-off: Temp. incr. too fast F.25 Safety switch-off: Flue temp. too high F.26 Fault: Fuel valve not working F.27 Safety switch-off: Flame simulation F.28 Start-up failure: Ignit. unsuccessful F.29 Operating failure: Ignit. unsuccessful F.32 Fault: Fan F.49 Fault: eBUS F.61 Fault: Fuel valve actuation F.62 Fault: Fuel valve switch-off delay F.63 Fault: EEPROM F.64 Fault: Electronics/sensor F.65 Fault: Electronics temp. F.67 Fault: Electronics/flame F.68 Fault: Flame signal unstable F.70 Fault: Invalid Device Specific Number F.71 Fault: Flow sensor F.72 Fault: Flow/return sensor F.73 Fault: Water press. sensor (signal too weak) F.74 Fault: Water press. sensor (signal too strong) F.75 Fault: Pump/ water shortage F.77 Fault: Flue non-ret. valve/condens. pump F.78 Interrupt.: DHW outlet sensor on ext. contr. F.83 Fault: NTC temp. gradient F.84 Fault: NTC temp. diff. implausible F.85 Fault: NTCs fitted incorrectly Communication fault Communication fault