To Next PageTo Next PageWhat to do if the flame goes off during operation of my Vaillant ecoTEC plus 637 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.
Why is there a dry fire in my Vaillant ecoTEC plus 637?
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 my Vaillant ecoTEC plus 637 shows water shortage and large temperature difference?
If your Vaillant Boiler indicates a water shortage and a large temperature difference between the flow and return NTC, the pump might be blocked or defective, the pump output might be too low, or the flow and return NTCs might be interchanged. Check and unblock or replace the pump and verify the NTC placement.
What to do if my Vaillant Boiler shows water shortage and a quick temperature rise?
If your Vaillant Boiler indicates a water shortage and a quick temperature rise, the pump might be blocked, the pump output might be insufficient, there might be air in the appliance, or the water pressure might be too low. Check and unblock or replace the pump and ensure adequate water pressure.
What causes fan speed variation in my Vaillant ecoTEC plus 637?
Fan speed variation in your Vaillant Boiler can be caused by a blocked fan, a plug not inserted correctly on the fan, a defective hall sensor, a fault in the cable harness, or defective electronics. Check the fan for blockages and connections, and inspect the sensors.
What does it mean if my Vaillant ecoTEC plus 637 Boiler 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 my Vaillant ecoTEC plus 637 Boiler 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.
What to do if the heating system of my Vaillant ecoTEC plus 637 Boiler 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.
Why is there incorrect sensing of flame in my Vaillant Boiler?
Incorrect sensing of flame in your Vaillant Boiler is caused by a defective flame detector. Replace the flame detector.
What does it mean if my Vaillant Boiler indicates a gas valve control defect?
A gas valve control defect could mean there is a short circuit or earth (ground) leak in the cable harness to the gas valves, the gas valve assembly is defective (earth/ground leak from coils), or the electronic control system is defective. Inspect and repair the gas valve control circuit.
General| Model | ecoTEC plus 637 |
|---|---|
| Category | Boiler |
| Output | 37 kW |
| Dimensions | 720 x 440 x 338 mm |
| Fuel Type | Natural Gas |
| Flow Rate | 15.2 L/min |
| Mounting | Wall-mounted |
| Max working pressure | 3 bar |
| Efficiency | 94% |
Guidance on using the documentation and understanding symbols.
General overview of the ecoTEC boiler and its purpose.
Basic notes on the boiler design and installation suitability.
Compliance with EU directives for gas appliances and EMC.
List of gas council approval numbers for ecoTEC appliances.
Detailed technical specifications including output, dimensions, and performance data.
Diagram and measurements for the boiler's physical dimensions.
Information regarding the installation of the boiler and its components.
Location and information found on the boiler's type plate.
Initial considerations for installing room-sealed appliances.
List of relevant standards and documents for boiler installation.
Details of items supplied with the Vaillant ecoTEC boiler.
Guidance on selecting an appropriate location for boiler installation, considering clearances and environment.
Requirements for gas supply, pipework, and connection to the boiler.
Details on approved Vaillant flue pipes and systems for safe exhaust removal.
Specifications for flue terminal positioning to ensure safety and proper operation.
Recommendations for air supply requirements for the boiler's operation.
Requirements for the electrical connection, including voltage, fuse rating, and safety.
Recommendations for the central heating water circulation system, pipework, and cleaning.
Details on the boiler's internal circulating pump specifications.
Information about the boiler's condensate trap and its function.
Guidelines and safety measures for safely transporting the boiler unit.
Specifies the necessary space around the boiler for installation and servicing.
Instructions for positioning and preparing the flue exit point.
Steps for securely mounting the boiler's hanging bracket.
Guidance on installing the air/flue duct system according to specific instructions.
Procedures for lifting and mounting the boiler onto its bracket.
Steps for safely removing the boiler's front casing.
General precautions related to the heating system before boiler connection.
Instructions for safely connecting the gas supply pipe to the boiler.
Procedures for connecting the cold water inlet and hot water outlet pipes.
Guidance on connecting and routing the condensate drain pipe to prevent freezing and blockages.
Steps for connecting the central heating flow and return pipes to the boiler.
Detailed instructions for connecting the heating flow and return pipes.
Procedure for installing the pressure relief valve's drain pipe.
Reference to separate instructions for connecting the flue system.
Overall requirements for safely connecting the boiler's electrical system.
General safety and compliance requirements for electrical work.
Steps for connecting the boiler to the mains electrical supply.
Diagram illustrating the wiring connections on the electric control board.
Information on connecting and using external Vaillant controls and accessories.
List of compatible Vaillant controls and their connection methods.
Notes on using thermostatic radiator valves with the boiler.
Details on the boiler's integral frost protection feature.
Information about the built-in circulating pump and its operation.
Explanation of the control that prevents short cycling.
Description of the APS feature to prevent pump seizure.
Essential electrical safety checks before initial operation.
Inspection, leak testing, and purging of the gas installation.
Procedure for checking and purging the cold water supply.
Procedure for filling and removing air from the heating system.
Instructions for performing an initial cold flush of the heating system.
Steps for filling the condensate siphon to ensure safety.
Guidance on adjusting the pump speed for optimal heating system performance.
Instructions for adjusting the boiler's automatic by-pass valve.
Verification of gas inlet pressure and rate to ensure correct operation.
Steps for securely refitting the boiler's front casing after servicing.
Overview of essential functional checks for the boiler.
Steps for performing functional checks after installation and before handover.
Checking the heating operation and status display.
Verifying the domestic hot water function for combination boilers.
Instructions for performing a final hot flush of the heating system.
Instructions for explaining boiler operation and maintenance to the end user.
Recommendations for initial inspection and safety checks before maintenance.
Crucial safety instructions to be followed before starting any maintenance work.
General procedures and checks to be performed during routine maintenance.
A table summarizing annual inspection and maintenance tasks.
Procedures for removing, cleaning, and refitting the burner module.
Steps for cleaning the condensate siphon to maintain safety and function.
Procedure for checking and adjusting the expansion vessel pressure.
Steps to recommission the boiler after maintenance tasks.
Checks to perform after completing any maintenance task.
A systematic approach to diagnosing and resolving boiler faults.
Explanation of the appliance's status codes displayed during operation.
Information on accessing and interpreting diagnostic codes for advanced troubleshooting.
List of fault codes and their potential causes for quick identification.
Instructions for accessing and clearing the stored fault memory.
Description of special test programs available for appliance functions.
Procedure to reset adjustable parameters back to factory default.
Critical safety precautions to be followed before replacing any boiler components.
Step-by-step guide for safely replacing the boiler burner.
Procedures for replacing the fan or the gas valve assembly.
Instructions for safely replacing the boiler's expansion vessel.
Step-by-step guide for safely replacing the primary heat exchanger.
Instructions for replacing the electronic control unit and display module.
Procedure for checking and adjusting CO2 levels for optimal combustion.
Guidelines for the environmentally responsible disposal of the boiler and packaging.
Information on recommended servicing and contacting Vaillant Service Solutions.
Official statement confirming compliance with relevant EU directives.
Essential requirements for flue system installation, including regulations and standards.
Key regulations and standards that must be adhered to during installation.
Guidance on planning the layout of the air and flue duct system.
Overview of available accessories for different flue termination types.
Table detailing maximum permitted flue lengths for various ecoTEC models.
Instructions for installing the sliding sleeve to accommodate flue movement.
Procedures for installing horizontal air/flue duct systems.
Initial steps for preparing the installation site for the horizontal flue duct.
Guidance for installing horizontal flue ducts exiting to the side.
Instructions for installing vertical air/flue duct systems.
Procedures for installing vertical flue ducts through pitched roofs.
Steps for installing vertical flue ducts through flat roofs.
Guidance on how to add extensions to the air/flue duct system.
Detailed steps for measuring and cutting air/flue duct extensions.
Instructions for installing 87-degree elbows in the air/flue duct system.
Instructions for installing 45-degree elbows in the air/flue duct system.
Essential requirements for flue system installation, including regulations and standards.
Guidance on planning the layout of the air and flue duct system.
Overview of available accessories for different flue termination types.
Table detailing maximum permitted flue lengths for various ecoTEC models.
Instructions for changing the appliance connection piece for different flue diameters.
Procedures for installing the sliding sleeve for flue adjustment.
Procedures for installing horizontal air/flue duct systems.
Initial steps for preparing the installation site for the horizontal flue duct.
Guidance for installing horizontal flue ducts exiting to the side.
Instructions for installing horizontal flue ducts with extensions.
Instructions for installing vertical air/flue duct systems.
Initial steps for preparing the installation site for the vertical flue duct.
Procedures for installing vertical flue ducts through pitched roofs.
Steps for installing vertical flue ducts through flat roofs.
Guidance on how to add extensions to the air/flue duct system.
Detailed steps for measuring and cutting air/flue duct extensions.
Instructions for installing 87-degree elbows in the air/flue duct system.
Instructions for installing 45-degree elbows in the air/flue duct system.
