Vaillant Boiler Error Codes
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Main Boiler Error Codes

Error CodeSystem Behavior
E1680Error code E168 could mean that your boiler has detected a problem but can’t work out exactly what it is
E20Central Heating NTC Fault indicate faulty components. You should make a note of the displayed error code
E28PCB Fault indicate faulty components
E50Hot Water NTC Fault indicate faulty components
E110– Safety Thermostat operated – displayed when the primary water pressure is less than 0.5 bar. After repressurising the system the boiler should operate. Your installer will be able to advise you about the method of repressurising.
E119Water pressure switch not operated – displayed when the primary water pressure is less than 0.5 bar. After repressurising the system the boiler should operate. Your installer will be able to advise you about the
method of repressurising
E33Interruption Of Gas Supply or Flame Failure indicates that the gas supply has been interrupted, ignition has failed or the flame has not been detected. Ensure that the gas supply has not been turned off, and turn the selector switch to the reset position and hold for at least 5 seconds. If the boiler does not relight, or the code is displayed regularly.
E60Fan or fan wiring fault

Main Eco Compact Boiler

Error CodeSystem Behavior
E09Gas valve connection error
E15vGas valve error
E20Central heating negative thermistor coefficient (NTC) sensor error
E28Flue negative thermistor coefficient (NTC) sensor error
E40Central heating return sensor error
E83Communication error
E109Pre-circulation fault
E110Safety thermostat operated
E118Primary system water pressure too low
E125Circulation error
E128Flame error
E130Flue negative thermistor coefficient (NTC) sensor operated
E133Interruption of gas supply or flame error
E135Interruption of gas supply
E154Flow return sensor temperature test
E160Fan or fan wiring error
E270Circulation fault (dry fire)
E321Hot water negative thermistor coefficient (NTC) error
E384False flame

Main Boiler error 133

The error code E133 on the Main boiler simply means that the condensate pipe is frozen. This issue usually occurs during the cold winter months as the condensate pipe leads outside. Luckily this is an issue that can be resolved fairly quickly without the need for an engineer. You just need to thaw out the condensate pipe.

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