Why is there a dry fire in my Vaillant Boiler?
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 pro 28 Boiler?
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 pro 28?
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 pro 28 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 pro 28 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.
Why won't my Vaillant ecoTEC pro 28 Boiler start?
If your Vaillant Boiler fails to ignite, it could be due to faults in the gas supply, such as a defective gas meter, air in the gas line, low gas flow pressure, or a tripped fire protection tap. It can also be caused by issues with the gas fitting, incorrect gas setting, a defective igniter, interrupted ionization current, faulty earthing, or defective electronics. Diagnose and rectify issues in the gas supply and fittings.
Why is there no pressure change when the pump turns on in my Vaillant Boiler?
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 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 ecoTEC pro 28 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.
General| Model | ecoTEC pro 28 |
|---|---|
| Category | Boiler |
| Output Rating | 28 kW |
| Efficiency Rating | A |
| Dimensions | 720 x 440 x 338 mm |
| Fuel Type | Natural Gas |
| Boiler Type | Combi |
| Mounting | Wall-mounted |
| Max. Heat Output (DHW) | 28 kW |
| ErP Efficiency | 94% |
| CH ErP Rating | A |
| DHW ErP Rating | A |
| Max. Working Pressure | 3 bar |
| Warranty | 2-5 years |
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