To Next PageTo Next PageWhat 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.
Why won't my Vaillant ecoTEC plus 624 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.
What to do if my Vaillant ecoTEC plus 624 Boiler is dry firing?
If your Vaillant Boiler is dry firing, it indicates there may be too little water in the appliance, a defective water shortage switch, a defective cable to the pump or water shortage switch, a blocked or defective pump, or the pump output is too low. Ensure adequate water supply and check the water shortage switch and pump.
Why does the flame go off during operation in my Vaillant Boiler?
If the flame goes off during operation and subsequent ignition attempts fail in your Vaillant Boiler, it could be due to a temporarily stopped gas supply, spark failure in the ignition transformer, or faulty earthing of the appliance. Check gas supply and ignition system for faults.
What causes rapid temperature rise in my Vaillant ecoTEC plus 624 Boiler?
A rapid temperature rise in your Vaillant Boiler, indicating a water shortage, can be caused by a blocked pump, insufficient pump output, air in the appliance, low plant pressure, or interchanged flow and return NTCs. Inspect system for air and correct pump issues.
Why is there a large temperature spread in my Vaillant Boiler?
A large temperature spread between the flow and return probe in your Vaillant Boiler, indicating a water shortage, can be caused by a blocked or defective pump, or the pump output being too low. Inspect and repair or replace the pump.
Why is my Vaillant Boiler fan speed too high on start?
If your Vaillant Boiler experiences fan speed variation (too high on start), the causes may be: 1. Blocked fans 2. Plug not inserted correctly on the fan 3. Defective hall sensor 4. Fault in cable harness 5. Defective electronics Inspect fan and connections, and replace defective components.
How do I fix a broken Flow-NTC in my Vaillant Boiler?
A broken Flow-NTC in your Vaillant Boiler can be caused by a defective or broken Flow-NTC cable, or a faulty NTC. Check and replace NTC or repair cable.
What causes a broken Return-NTC in a Vaillant Boiler?
A broken Return-NTC in your Vaillant Boiler can be caused by a defective or broken Return-NTC cable, or a faulty NTC. Check and replace NTC or repair cable.
What to do if there is a short circuit in the flow-NTC of my Vaillant ecoTEC plus 624?
If there is a short circuit in the flow-NTC of your Vaillant Boiler, it could be due to the NTC plug shorted to the casing or a defective NTC. Inspect and replace the NTC if defective.
General| Model | ecoTEC plus 624 |
|---|---|
| Category | Boiler |
| Output | 24 kW |
| Dimensions (H x W x D) | 720 x 440 x 338 mm |
| Mounting | Wall-mounted |
| Fuel | Natural Gas |
| Warranty | 5 years |
| Type | Combination |
| Central Heating Flow Temperature Range | 30°C to 80°C |
Details on manual usage, safety symbols, and applicable documents for clarity.
Overview of ecoTEC boiler types, features, and operation principles.
Explains safety instructions and symbols for safe operation and installation.
Detailed technical specifications including heat output, dimensions, gas pressure, and electrical data.
Provides diagrams and measurements for boiler installation and required clearances.
Lists relevant regulations, British Standards, and publications for boiler installation.
Specifies requirements for boiler location, space, ventilation, and frost protection.
Details gas supply connection and regulations for standard and optional flue systems.
Outlines mains electricity supply requirements, earthing, and connection methods.
Guidance on safe manual handling and positioning of the boiler during installation.
Specifies minimum clearances around the boiler for installation and servicing.
Procedure for connecting the gas supply and heating system pipework.
Explains wiring procedures for connecting the boiler to the main electrical supply.
Describes Vaillant controls, external electrical connections, and accessory compatibility.
Covers initial checks for electrical supply, gas supply, and cold water systems.
Guide on filling the heating system, bleeding air, and checking pressure.
Details annual inspection and maintenance tasks for safe boiler operation.
Instructions for removing, cleaning, and refitting the burner module for maintenance.
Procedure for cleaning the condensate siphon for proper drainage and safety.
A systematic approach to diagnosing and resolving common boiler faults.
Explanation of status codes (S.x) and diagnostic codes (d.x) for appliance monitoring.
Crucial safety precautions before and during component replacement.
Guidance on replacing common parts like the burner, fan, gas valve, and heat exchanger.
Document certifying the boiler's compliance with relevant EC directives.
Checklist for ensuring proper installation, commissioning, and handover of the boiler.
