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Jennifer SaundersSep 23, 2025
What to do if the fan is running in my Vaillant ecoTEC plus Boiler?
- JJuan MurphySep 23, 2025
No action is required if the fan is running in your Vaillant Boiler.
What to do if the fan is running in my Vaillant ecoTEC plus Boiler?
No action is required if the fan is running in your Vaillant Boiler.
What to do if Vaillant ecoTEC plus has no heat demand?
If your Vaillant Boiler isn't responding to external controls, ensure that all external controls are switched on and are actively requesting heat. If no external controls are installed, make sure terminals 3 and 4 on the boiler are linked.
What does it mean if my Vaillant Boiler reports Flow and/or return NTC fault?
If your Vaillant Boiler reports a Flow and/or return NTC fault, it means the Flow and/or return NTC is defective (tolerances too big). Replace the Flow and/or Return NTC.
What to do if my Vaillant Boiler flame goes off during operation?
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 earth connection.
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.
What to do if my Vaillant Boiler shows water shortage and quick temperature rise?
If your Vaillant Boiler indicates a water shortage and a rapid temperature increase, it may be due to a blocked pump, insufficient pump output, air in the appliance, or water pressure that is too low. Bleed the system and check water pressure.
What does 'eBUS under voltage' mean on my Vaillant ecoTEC plus?
An 'eBUS under voltage' error indicates a short circuit on the eBUS, an overload on the eBUS, or two power sources on the eBUS with different polarity. Check eBUS connections and ensure correct polarity.
What causes a Vaillant Boiler to have a defective gas-valve control?
A defective gas-valve control in your Vaillant Boiler can be caused by a short circuit or earth leak in the cable harness to the gas valves, a defective gas valve assembly, or defective electronics. Inspect gas valve connections and components.
What causes a Vaillant ecoTEC plus gas valve shut off delay?
A gas valve shut off delay in your Vaillant Boiler can be caused by a leaking gas valve or defective electronics. Check the gas valve for leaks and inspect electronics.
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) |
Explains the classification of warnings by severity (Danger, Warning, Caution) and the structure of warning messages.
Defines the proper and improper uses of the Vaillant ecoTEC plus boiler and the manufacturer's liability.
Covers installation, gas/flue gas safety, preventing scalding, material damage, and frost damage.
Introduces the control elements of the ecoTEC plus and the Digital Information and Analysis System (DIA).
Instructions for opening/closing isolator devices and switching the boiler on, with frost protection warnings.
Guidance on checking the heating system's fill level and the procedure for filling it, including water quality advice.
Guidance on temporarily shutting down the boiler and activating frost protection, including draining the system.
Explains how fault codes and plain text messages are displayed and what to do when they appear.
Provides a table for self-checking common problems like no hot water, heating failure, or low system pressure.
Addresses resolving ignition faults and recognizing maintenance messages, advising professional help when needed.
Emphasizes the importance of annual servicing by a qualified professional for optimal performance and longevity.
