To Next PageTo Next PageWhat does it mean if my Vaillant ecoTEC plus 637 Boiler water pressure sensor signal is out of range (too high)?
If the water pressure sensor signal is out of range (too high), the cable to the water pressure sensor has a short-circuit at 5 V / 24 V, or there is an internal fault in the water pressure sensor. Inspect and repair the cable and replace the water pressure sensor.
What to do if my Vaillant ecoTEC plus 637 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 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 detects no pressure rise on turning on the pump?
If no pressure rise was detected on turning on the pump, the water pressure sensor or/and pump may be defective, there may be air in the heating system, the quick bleeder may be defective, or there may be too little water in the appliance. Check and repair the pump and pressure sensor and ensure sufficient water.
What to do if the gas supply to my Vaillant Boiler is off?
If the gas supply to your Vaillant Boiler is off or not correctly purged, check that the gas supply to the boiler is on, that it has been correctly purged, and that an inlet pressure of 20 mbar is available at the gas valve.
What does EEPROM error mean in my Vaillant ecoTEC plus 637 Boiler?
An EEPROM error indicates that the electronics are defective. Replace the defective electronics.
What does it mean if my Vaillant ecoTEC plus 637 Boiler displays electronics/NTC fault?
An electronics/NTC fault indicates a short-circuit in the flow or return NTC, or that the electronics are defective. Check and replace the NTC or repair the electronics.
What to do if external controls of my Vaillant ecoTEC plus 637 are not calling for heat?
If your Vaillant Boiler's external controls are not on or calling for heat, check that all external controls are on and calling for heat.
Why is the safety temperature limiter by NTC activated in my Vaillant Boiler?
The safety temperature limiter by NTC might be activated because the Flow-NTC is not correctly thermal-connected or is defective, causing the appliance not to shut down. Check the thermal connection of the Flow-NTC and replace it if defective.
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.
