To Next PageTo Next PageWhy is there a dry fire in my Vaillant ecoTEC plus 612?
A dry fire in your Vaillant Boiler can occur due to too little water in the appliance, a defective water pressure sensor, a defective cable to the pump or water sensor, a blocked or defective pump, or a pump output that is too low. Ensure sufficient water supply and check the pump and sensors for faults.
What to do if the flame goes off during operation of my Vaillant ecoTEC plus 612?
If the flame goes off during operation and subsequent ignition attempts fail, it could be due to a temporarily stopped gas supply or faulty earthing of the appliance. Check the gas supply and earthing connections.
What to do if my Vaillant Boiler appliance does not start and ignition fails?
If your Vaillant Boiler fails to start and ignition attempts fail, there may be faults in the gas supply, such as a defective gas meter or gas pressure detector, air in the gas, gas flow pressure too low, or a disengaged fire protection tap. There may be faults in the gas valve, wrong gas setting, defective igniter (ignition transformer, ignition cable, ignition plug), stopped ionization current (cable, electrode), faulty earthing in the appliance or defective electronics. Inspect the gas supply and ignition components for faults.
What does it mean 'No valid DSN in AI and/or BMU' in Vaillant ecoTEC plus 612?
If your Vaillant Boiler displays 'No valid DSN in AI and/or BMU', it indicates a spare part failure where the AI and motherboard were interchanged at the same time. Replace faulty components to resolve DSN issue.
What causes a short circuit in the tank sensor of my Vaillant ecoTEC plus 612 Boiler?
A short circuit in the tank sensor of your Vaillant Boiler can be caused by a defective NTC, an earth leak/short circuit in the cable loom, or a damp plug connection. Inspect and replace the NTC or repair damp connections.
Why does my Vaillant ecoTEC plus 612 Boiler show a flame when the gas valve is off?
If your Vaillant Boiler shows a secondary light, where the ionization signal reports a flame even when the gas valve is turned off, it could be due to defective gas solenoid valves or a defective flame detector. Inspect and replace the gas valves or flame detector.
What to do if the drinking water outlet probe stopped in my Vaillant ecoTEC plus 612?
If the drinking water outlet probe has stopped (
Why is there no pressure change when the pump turns on in my Vaillant ecoTEC plus 612?
If no sudden change in pressure is detected when turning on the pump in your Vaillant Boiler, it could be due to a defective water pressure sensor or pump, or too little water in the appliance. Ensure sufficient water supply and inspect the pump.
What causes a flow and/or return sensor fault in my Vaillant ecoTEC plus 612 Boiler?
A fault in the flow and/or return sensor of your Vaillant Boiler is caused by defective flow and/or return sensors. Replace the defective sensors.
What does it mean if the flow sensor reports a constant value in my Vaillant Boiler?
If the flow sensor reports a constant value in your Vaillant Boiler, it indicates that the flow sensor is defective. Replace the flow sensor.
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