To Next PageTo Next PageWhy is there a dry fire in my Vaillant Boiler?
A dry fire in your Vaillant Boiler can occur due to 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 a pump output that is too low. Ensure sufficient water supply and check the pump and sensors for faults.
What to do if the flame goes off during operation of my Vaillant ecoTEC plus 618 Boiler?
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 earthing connections.
What to do if my Vaillant ecoTEC plus 618 appliance does not start and ignition fails?
If your Vaillant Boiler fails to start and ignition attempts fail, there may be faults in the gas supply, such as a defective gas meter or gas pressure detector, air in the gas, gas flow pressure too low, or a disengaged fire protection tap. There may be faults in the gas valve, wrong gas setting, defective igniter (ignition transformer, ignition cable, ignition plug), stopped ionization current (cable, electrode), faulty earthing in the appliance or defective electronics. Inspect the gas supply and ignition components for faults.
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 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.
Why does my Vaillant ecoTEC plus 618 Boiler show a flame when the gas valve is off?
If your Vaillant Boiler shows a secondary light, where the ionization signal reports a flame even when the gas valve is turned off, it could be due to defective gas solenoid valves or a defective flame detector. Inspect and replace the gas valves or flame detector.
Why won't my Vaillant Boiler start?
If your Vaillant Boiler fails to ignite, it could be due to faults in the gas supply, such as a defective gas meter, air in the gas line, low gas flow pressure, or a tripped fire protection tap. It can also be caused by issues with the gas fitting, incorrect gas setting, a defective igniter, interrupted ionization current, faulty earthing, or defective electronics. Diagnose and rectify issues in the gas supply and fittings.
Why is there no pressure change when the pump turns on in my Vaillant ecoTEC plus 618?
If no sudden change in pressure is detected when turning on the pump in your Vaillant Boiler, it could be due to a defective water pressure sensor or pump, or too little water in the appliance. Ensure sufficient water supply and inspect the pump.
What causes a flow and/or return sensor fault in my Vaillant ecoTEC plus 618 Boiler?
A fault in the flow and/or return sensor of your Vaillant Boiler is caused by defective flow and/or return sensors. Replace the defective sensors.
What does it mean if the flow sensor reports a constant value in my Vaillant ecoTEC plus 618?
If the flow sensor reports a constant value in your Vaillant Boiler, it indicates that the flow sensor is defective. Replace the flow sensor.
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.
