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 Vaillant ecoTEC plus temperature rises too quickly?
If your Vaillant Boiler experiences a rapid temperature increase due to water shortage, the pump may be blocked, have insufficient output, or there might be air in the system, or the water pressure might be too low. Check the pump for blockages and make sure the water pressure is adequate.
What to do if my Vaillant ecoTEC plus Boiler electronics temperature is too high?
If the electronics temperature is too high in your Vaillant Boiler, it could be due to the electronics being too hot from an external effect, or the electronics being defective. Ensure proper ventilation for electronics.
What does EEPROM error mean on my Vaillant ecoTEC plus Boiler?
An EEPROM error on your Vaillant Boiler indicates defective electronics. Replace the electronics.
How to troubleshoot dry fire in Vaillant ecoTEC plus Boiler?
Dry fire in your Vaillant Boiler can be caused by 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 the pump output being too low. Check water levels and pump functionality.
What to do if the central heating thermostat knob is turned off or there is no heat demand by the eBUS control unit in my Vaillant ecoTEC plus?
If the central heating thermostat knob is turned off or there is no heat demand by the eBUS control unit in your Vaillant Boiler, turn the central heating thermostat knob to the desired setting.
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 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 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 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.
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.
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