Vaillant TurboMAX Plus 828/2E Boiler Fault Codes

Display	Indication	Displayed values/adjustment values
F00	Flow-NTC: NTC broken; NTC cable broken; Defective connection at NTC Defective connection at electronics	Flow-NTC cable defective/ broken NTC faulty
F01	Return NTC: NTC broken; NTC cable broken; Defective connection at NTC Defective connection at electronics	Return-NTC cable defective/broken NTC faulty
F10	Short circuit - flow-NTC (<130°C)	NTC-plug shorted to casing, NTC defective
F11	Short circuit - return-NTC (<130°C)	NTC-plug shorted to casing, NTC defective
F20	Over heat cut off activated	Maximum temperature exceeded
F22	Low water or no water in appliance	No water in system Pump defective Pump lead defective
F27	No demand to gas valve	Electronic board defective; Gas valve defective
F28	Boiler goes to lock out	No gas; Insufficient gas; Incorrect gas valve adjustment; Electrode defective; Ignition lead defect; Electronic igniter defective
F29	Flame extinguished re-ignition unsuccessful	Gas supply absent or insufficient
F42	Faulty cable loom	Faulty or incorrect loom fitted
F43	Faulty cable loom	Faulty or incorrect loom fitted
F60 to F67	Irreversible electronic system malfunction	Electronic system defective