What to do if my Vaillant eco TEC plus 428'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 428?
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 428 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 428 Boiler 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 428 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 428 |
|---|---|
| Category | Boiler |
| Output | 28 kW |
| Fuel Type | Natural Gas |
| Weight | 37 kg |
| Mounting | Wall-mounted |
| ErP Rating | A |
| Max. Working Pressure | 3 bar |
Overview of ecoTEC plus boilers, system compatibility, and automatic operation.
Information on the boiler's design, flue system, and diagnostic features.
Comprehensive table of technical specifications for ecoTEC plus models.
Diagrams showing boiler dimensions and key installation components.
Guidance on selecting installation site and connecting the gas supply.
Details on available flue systems, termination, and internal installation.
Requirements for hot water cylinders, condensate, controls, and system flushing.
Details on safety valves, expansion vessels, and pressure gauges for sealed systems.
Guidance on boiler location, clearances, and items included in the delivery.
Instructions for flue exit options and safe gas connection procedures.
Steps for water connections, condensate drain, and electrical hook-up.
Details on connecting optional controls, timers, and the VR 65 control centre.
Initial system preparation and gas supply testing before commissioning.
Procedures for initial boiler lighting and addressing ignition or flue issues.
Steps to verify heating and domestic hot water system functionality.
Guidance for user instruction, servicing importance, and warranty information.
Crucial safety steps and initial inspection procedures before maintenance.
Overview of annual inspection and maintenance steps for the boiler.
Procedures for servicing the spark electrode, burner, and heat exchanger.
Steps for testing operation, checking seals, and recommissioning the boiler.
Procedure for measuring and adjusting CO2 for optimal combustion performance.
A systematic approach to diagnosing boiler faults before using codes.
Explanation of status codes and how to access diagnostic information.
Details on fault codes, their causes, and accessing the fault memory.
Essential safety instructions and general guidelines for replacing parts.
Step-by-step instructions for replacing specific components like burner, gas valve, fan.
Information on environmentally responsible disposal of the appliance and packaging.
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