What to do if my Vaillant Boiler's heating system is not full of water?
If the heating system of your Vaillant Boiler is not full of water or the design pressure is not attained, ensure the heating system is full of water and the system design pressure is attained. If it's not, refill and vent the system. Also, ensure any flow and return isolating valves are fully open.
What to do if domestic hot water temperature is set to minimum on my Vaillant eco TEC plus 438 Boiler?
If the domestic hot water temperature is set to minimum on your Vaillant Boiler, set the domestic hot water temperature to maximum. Note: This applies only if additional Vaillant accessories are fitted.
What to do if the external electricity supply to my Vaillant eco TEC plus 438 Boiler is off?
If the external electricity supply to your Vaillant Boiler is off, verify that the external electricity supply is on and that a supply of 230 V~ is present between the boiler terminals ‘L’ and ‘N’.
What to do if the gas supply to my Vaillant eco TEC plus 438 is off?
If the gas supply to your Vaillant Boiler is off, check that the gas supply to the boiler is on, that it has been correctly purged, and that an inlet pressure is present.
What to do if external controls of my Vaillant eco TEC plus 438 are off?
If the external controls of your Vaillant Boiler are off or not functioning, check that all external controls are on and calling for heat. If no external controls are fitted, boiler terminals 3 and 4 must be linked.
General| Model | ecoTEC plus 438 |
|---|---|
| Category | Boiler |
| Output | 38 kW |
| Dimensions | 720 x 440 x 338 mm |
| Weight | 42 kg |
| Fuel | Natural Gas |
| Mounting | Wall-mounted |
| ErP Rating | A |
| Warranty | 5 years |
| Efficiency | 94% |
| Hot Water Flow Rate | 15.2 l/min |
| Type | Combination boiler |
Guidance on documentation clarity, symbols, and related instructions.
List of owner and installer documentation for the appliance.
Instruction to keep all related literature and documents safe for future reference.
Observation of safety instructions and symbols for safe appliance operation.
Overview of ecoTEC plus boilers, their capabilities, and models.
General information regarding the boiler's design, flue systems, and diagnostics.
Details on gas category, safety regulations, handling, and clearances.
Detailed technical specifications and performance data for ecoTEC plus models.
Diagrams showing physical dimensions and connection points of the boiler.
Diagrams illustrating key function elements of the boiler.
Pre-installation notes for room sealed appliances, emphasizing Vaillant flue systems.
List of relevant regulations, standards, and publications for boiler installation.
Guidance on selecting an appropriate and safe location for boiler installation.
Requirements and guidelines for proper gas supply connection and safety checks.
Description of available flue systems and installation considerations.
Details on correct placement and clearances for flue terminals.
Instructions for installing flue systems within the building.
Recommendations for ensuring adequate air supply to the appliance.
Ventilation requirements for boilers installed in cupboards or compartments.
Requirements for domestic hot water cylinders integrated with the boiler.
Installation guidelines for the condensate drain pipe.
Recommendations for programmer and thermostat setup for heating control.
Requirement for a draining tap at the lowest system points for draining.
Information on safety valve fitting and requirements for heating water systems.
Requirement for installing a system bypass for proper operation.
Guidance on pump selection, setting, and temperature difference.
Procedure for flushing and treating heating systems with cleanser and inhibitor.
Diagram and requirements for open vented heating systems.
Compliance requirements and guidelines for sealed water systems.
Specifications for safety valve installation and discharge pipe routing.
Requirements for expansion vessel installation, sizing, and charge pressure.
Requirement for a permanently fitted pressure gauge for system monitoring.
Provision for replacing system water loss using a make-up bottle or filling loop.
Method for filling sealed water systems using a proprietary filling loop.
Guidelines for selecting the optimal and safe boiler installation site.
Safety precautions for handling sheet metal parts during installation.
Minimum operational and servicing clearances required around the boiler.
Installation guidance for boilers fitted in timber frame buildings.
List of all components included in the boiler package for installation.
Instructions and considerations for flue exit installation.
Details on alternative flue systems, bends, and elbows.
Procedure for correctly fitting the boiler hanging bracket to the wall.
Steps for lifting and fixing the boiler onto the installed hanging bracket.
Instructions for safely removing the boiler's front casing for access.
Safety and procedural guidelines for making the gas connection.
Instructions for making all necessary water connections to the boiler.
Guidelines for connecting the condensate drain and trap.
Procedure for installing the air/flue duct system components.
Safety and connection details for the boiler's electrical wiring.
Steps for connecting the power supply flex to the appliance.
Procedure for connecting wires to the terminal block and checking installation.
Diagram illustrating the layout of connections on the electrical board.
Initial checks and preparation steps before commissioning all systems.
Checks and procedures for gas supply soundness and purging before operation.
Step-by-step procedure for initial boiler lighting and operation.
Troubleshooting steps for burner ignition failures and fault codes.
Troubleshooting steps for fan or flue system issues indicated by fault codes.
Procedure for testing gas inlet pressure and maximum gas rate.
Checks for heating operation, status indicators, and pump overrun.
Check for domestic hot water operation with optional accessories.
Explanation of the pump exercise function to prevent sticking.
Instructions for user handover, including operation and service recommendations.
Information on Vaillant warranty terms, conditions, and installation compliance.
Recommended procedures for initial inspection of the boiler for safe operation.
Essential safety precautions before starting any maintenance work on the appliance.
Steps for initial inspection before commencing servicing or maintenance work.
Procedure for performing functional checks of the boiler's operation.
Steps for removing boiler casings for general servicing access.
Procedure for inspecting, cleaning, and checking the spark electrode.
Instructions for removing the burner assembly, including seal replacement.
Cleaning the combustion chamber and heat exchanger using brushes and vacuum.
Procedure for flushing the condensate drain to ensure free water flow.
Checking and replacing the inner casing panel seal for proper fitment.
Procedure for checking the expansion vessel's pressure.
Steps for re-commissioning the boiler after maintenance is completed.
Final checks to be performed after completing any maintenance task.
Procedure for checking and adjusting the CO2 content for optimal combustion.
Systematic steps for identifying and resolving boiler faults and issues.
Explanation of appliance status codes displayed on the unit.
Accessing and understanding diagnostic codes for advanced fault finding.
List of fault codes and their meanings for troubleshooting.
Accessing and clearing the fault memory to review past errors.
Description of special test programs for checking appliance functions.
Procedure for resetting appliance parameters to factory default settings.
Critical safety precautions required before replacing any appliance components.
Procedure for replacing the boiler burner assembly.
Procedure for replacing the gas valve, including fan and burner removal.
Procedure for replacing the boiler fan assembly.
Procedure for replacing the boiler's heat exchanger unit.
Procedure for replacing the condensate trap and siphonic drain components.
Procedure for replacing electronic components and the appliance display.
Information on appliance recycling, focusing on metal components.
Details on packaging materials and their recyclability.
Information regarding recommended regular servicing and contact details.
EC declaration of conformity for the appliance, listing directives.
Checklist to be completed for gas boiler commissioning and handover.
Logbook for recording appliance service history and intervals.
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