To Next PageTo Next PageWhat does it mean if my Vaillant ecoTEC plus 618 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 plus 618 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 ecoTEC plus 618 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 Boiler?
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 ecoTEC plus 618 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 plus 618?
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 Boiler?
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 plus 618?
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 plus 618 |
|---|---|
| Category | Boiler |
| Output | 18 kW |
| Dimensions | 720 x 440 x 338 mm |
| Fuel Type | Natural Gas |
| ERP Rating | A |
| Mounting | Wall-mounted |
| Warranty | 5 years |
| Boiler Type | Combi |
| Efficiency | 94% |
Guidance on documentation usage, symbols, CE marking, and data badge.
Overview of the ecoTEC boiler and installation requirements.
General notes on boiler design, mounting, and flue systems.
Details of compliance with EU directives and basic requirements.
Detailed technical specifications and performance data for ecoTEC boilers.
Diagrams and measurements for boiler installation and clearances.
Diagrams showing function elements of combination and system boilers.
Requirements for room-sealed appliances and flue system installation.
List of related documents and British Standards for installation.
Guidelines for selecting an appropriate and safe installation location for the boiler.
Requirements and checks for the gas supply to the boiler.
Information on standard and optional flue pipe systems and their installation.
Details and diagrams for correct flue termination positions.
Requirements for the mains electricity supply connection, including safety.
Guidance on water circulation, filling, pressure, and expansion vessel requirements.
Recommendations and safety guidelines for lifting and transporting the boiler.
Diagrams showing minimum clearances required around the boiler for installation.
Instructions for marking and preparing the flue exit hole.
Steps for securely fitting the boiler's hanging bracket to the wall.
Instructions for safely connecting the gas supply to the boiler.
Guidance on connecting the condensate drain pipe and its installation requirements.
Instructions for connecting the heating circuit pipework to the boiler.
General requirements and safety precautions for electrical connections.
Information on Vaillant controls and accessories for the ecoTEC series.
Checks to be performed on the electrical installation before commissioning.
Inspection, leak checks, and purging of the gas installation.
Steps for filling and bleeding the heating system, including using test programs.
Instructions for filling the condensate siphon to prevent fume escape.
Procedure for adjusting the appliance's adjustable by-pass valve.
Steps for checking gas inlet working pressure and gas rate.
Instructions for refitting the boiler's front casing after maintenance.
Procedure for performing functional checks before commissioning.
Procedure for checking heating operation and status displays.
Instructions for handing over the appliance to the user, including settings and explanations.
Recommendations for initial inspection and frequency of servicing.
Crucial safety instructions to be followed before starting any maintenance work.
Detailed steps for removing and servicing the burner module.
Procedure for cleaning the condensate siphon, including safety notes.
Step-by-step checks for identifying and resolving boiler faults.
Explanation of status codes displayed by the appliance.
Accessing and understanding diagnostic codes for troubleshooting.
How to access and review the stored fault memory.
Essential safety precautions before replacing boiler components.
Procedure for replacing the burner module, including safety.
Steps for replacing the fan or gas valve, with safety precautions.
Instructions for replacing the primary heat exchanger, with safety.
Procedure for replacing the electronic components or display unit.
How to check and adjust CO2 content for optimal combustion.
