• Vaillant Boiler Fault Codes

Listed below are Vaillant boiler fault codes and Vaillant boiler Manuals.

Fault Code
Possible Cause
Meaning
F.00 N NTC FAULTS This means that your Flow NTC (Negative Temperature Coefficient Thermostat) cable is either defective or broken and needs to be replaced
F.01 NTC FAULTS (feed temperature sensor) – faulty connection and open circuit. This means that your Flow NTC (Negative Temperature Coecient Thermostat) cable is either defective or broken and needs to be replaced
F.10 NTC FAULTS (feed temperature sensor) – short circuit
F.13 NTC FAULTS (feed temperature sensor) – short circuit
F.20 NTC FAULTS (feed temperature sensor) Your boiler has exceeded the maximum temperature and needs to be allowed to cool down
F.22 DRY FIRE, LOW WATER IN SYSTEM/OVERHEAT This means either there is no water in your system, you have a defective pump or the pump lead is defective
F.24 LOW WATER, OR PUMP FAILURE/BLOCKAGE Your pump could be obstructed, running at low capacity, or there could be air trapped in your appliance. Additionally, the pressure in your system may be too low.
F.28 NO IGNITION/IGNITION PROBLEM This means there is either insucient gas in the system, a defective electrode, ignition lead or electronic ignitor
F.29 FLAME EXTINGUISHED. FAN/FLUE PROBLEM/GAS Your flame, or pilot light has gone out. Check your ue duct or gas supply to see if there is a problem there.
F.60 GAS VALVE CONTROL – DEFECTIVE Your cable loom which connects to your gas valve may have short circuited. Alternatively, you could have a defective gas valve assembly or electronic control system.
F.61 GAS VALVE CONTROL – DEFECTIVE Your cable loom which connects to your gas valve may have short circuited. Alternatively, you could have a defective gas valve assembly or electronic control system.
F.62 DEFECTIVE GAS VALVE CLOSURE MECHANISM Your boiler has exceeded the maximum temperature and needs to be allowed to cool down
F.63 EEPROM ERROR This is an electronic fault within your system. EEPROM stands for Electrically Erasable Programmable Read-Only Memory
F.64 ELECTRONIC SYSTEM/SENSOR FAULT Your ow or backow NTC has suered a short circuit, or an electronic fault
F.65 ELECTRONIC SYSTEM TEMPERATURE TOO HIGH This can happen because of an external heat source or an electrical fault
F.67 ELECTRONIC FAULT IN FLAME SYSTEM

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Fault Code
Cause of Problem
F.1 Lack of gas, a fault with the ignition or flue, or you may need to adjust the gas valve or replace a defective electrode lead
F.4 Ignition fault.
F.5 The system has suered a fault due to overheating.
F.6 Your flow NTC has developed a fault.
F.17 Check the polarity of your system
F.24 Pump-related faults – the pump could have failed, it may have over run or there could be an issue with the air lock

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Fault Code
Cause of Problem
F.00, .04, .05, .10, .14, .15 All of these are NTC faults, and are best resolved by rst changing all NTCs to make diagnosis earlier.
F.21 The pilot ame has failed.
F.22 There is insucient water in your system
F.11 A blockage in the appliance is preventing the system from flowing as it should
F.12 A blockage in the appliance is affecting the system’s pressure
F.13 The appliance is blocked because of a water deficiency

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