What does it mean if my Vaillant ecoTEC pro 28 Boiler shows eBUS undervoltage?
An eBUS undervoltage indication means there could be a short circuit on the eBUS, an overload on the eBUS, or two power sources on the eBUS with different polarity. Check the eBUS connections and power sources.
What to do if the heating system of my Vaillant ecoTEC pro 28 is not full of water?
If your Vaillant Boiler's heating system isn't full of water or charged correctly, make sure the heating system is full of water and charged to between 1 and 1.5 bar. If it's not, refill and vent the system.
What to do if my Vaillant Boiler is dry firing?
If your Vaillant Boiler is dry firing, it indicates there may be too little water in the appliance, a defective water shortage switch, a defective cable to the pump or water shortage switch, a blocked or defective pump, or the pump output is too low. Ensure adequate water supply and check the water shortage switch and pump.
Why does the flame go off during operation in my Vaillant ecoTEC pro 28?
If the flame goes off during operation and subsequent ignition attempts fail in your Vaillant Boiler, it could be due to a temporarily stopped gas supply, spark failure in the ignition transformer, or faulty earthing of the appliance. Check gas supply and ignition system for faults.
What to do if my Vaillant Boiler shows a gas valve shutoff delay?
If your Vaillant Boiler shows a gas valve shutoff delay, the gas valve may be leaking, or the electronics may be defective. Inspect the gas valve for leaks and test the electronics.
How to fix Flow NTC open circuit in Vaillant Boiler?
A Flow–NTC open circuit can be caused by a broken NTC, a broken NTC cable, a defective connection at the NTC, or a defective connection at the electronics. Check and repair the NTC and connections.
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.
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 to do if the water pressure sensor or cable harness hydraulics are defective in my Vaillant ecoTEC pro 28 Boiler?
If the water pressure sensor or cable harness hydraulics are defective in your Vaillant Boiler, it could be due to a broken line to the water pressure sensor, a short-circuit at 0 V, or a defective water pressure sensor. Inspect and replace the water pressure sensor or repair the line.
What to do if there is a short circuit in the flow-NTC of my Vaillant Boiler?
If there is a short circuit in the flow-NTC of your Vaillant Boiler, it could be due to the NTC plug shorted to the casing or a defective NTC. Inspect and replace the NTC if defective.
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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