Why is my Vaillant ecoTEC plus fan speed varying?
Fan speed variation in your Vaillant Boiler can be caused by a blocked fan, the plug not being inserted correctly on the fan, a defective hall sensor, a fault in the cable harness, or defective electronics. Inspect the fan and its connections.
What to do if my Vaillant Boiler appliance does not start?
If your Vaillant Boiler doesn't start and ignition fails, the issue might stem from problems with the gas supply. Verify the gas meter, check the gas pressure detector, bleed any air from the gas lines, and confirm that the fire protection tap is properly engaged.
How to fix a Vaillant ecoTEC plus Boiler when the start up ignition is unsuccessful?
If your Vaillant Boiler fails to start up due to unsuccessful ignition, you can manually reset the boiler by pressing and holding the reset button for one second. If resetting the boiler three times doesn't resolve the ignition problem, it's recommended to consult a qualified professional.
What happens if the filling pressure is too low in my Vaillant Boiler?
If the display of the filling pressure for your Vaillant Boiler's heating system is too low, and it falls below 0.05 MPa (0.5 bar), the boiler will switch off and show the fault message F.22. To restart the boiler, you need to fill the heating system with water.
What to do if my Vaillant ecoTEC plus Boiler has no heat demand?
To resolve the issue of no heat demand in your Vaillant Boiler, check that all external controls are on and calling for heat. If no external controls are fitted, boiler terminals 3 and 4 must be linked.
What to do if Safety temperature limiter by NTC is activated on my Vaillant Boiler?
If the safety temperature limiter by NTC is activated on your Vaillant Boiler, it's because the Flow-NTC is not correctly thermal-connected or defective, and the appliance does not shut down. Check and correct thermal connection of Flow-NTC.
What to do if my Vaillant ecoTEC plus Boiler has a Return NTC short circuit?
If your Vaillant Boiler has a Return NTC short circuit, it could be due to a defective NTC, a short circuit in the cable harness, or a cable/casing short cut. Check for short circuit in cable harness or NTC.
Why is my Vaillant ecoTEC plus Boiler not starting up, and there's no hot water or heating?
If your Vaillant Boiler isn't starting, resulting in no hot water and cold heating, several factors could be at play. First, ensure that both the on-site gas isolator cock and the product's gas isolator cock are open. Next, check if there's a power supply issue in your building by inspecting the fuse. If the boiler is switched off, turn it on. Also, verify that the heating flow and hot water temperatures are appropriately set. If these steps don't resolve the issue, there might be air in the heating installation, which requires purging by a professional. Finally, if the boiler enters fault mode (F.28) after three failed ignition attempts, press the fault clearance key. If the ignition fault persists after three clearance attempts, seek professional assistance.
What to do if my Vaillant Boiler is overheating?
If the overheating protection on the primary heat exchanger is triggered, it could be due to a defective cable or cable connection of the fuse in the primary heat exchanger, or the primary heat exchanger itself being defective. Inspect primary heat exchanger connections.
What to do if my Vaillant Boiler shows water shortage and large temperature difference?
A water shortage with a large temperature difference between the flow and return NTC in your Vaillant Boiler could be caused by a blocked or defective pump, the pump output being too low, or the flow and return NTCs being interchanged. Check pump and NTC placements.
General| Model | ecoTEC plus |
|---|---|
| Category | Boiler |
| Type | Condensing |
| Dimensions (H x W x D) | 720mm x 440mm x 338mm |
| ErP Rating | A |
| Mounting | Wall-mounted |
| Output Range | 12kW to 38kW |
| Fuel Type | Natural Gas |
| Domestic Hot Water Output | 38kW |
| Flow Rate | 15.9 l/min |
| NOx Emissions | Class 5 |
| Efficiency | 94% (SAP 2009) |
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