To Next PageTo Next PageWhat 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.
What to do if the heating system of my Vaillant 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 the safety temperature limiter by NTC activated in my Vaillant ecoTEC plus 837?
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.
What to do if my Vaillant ecoTEC plus 837 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 does it mean if my Vaillant 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 causes fan speed variation in my Vaillant Boiler?
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 to do if my Vaillant ecoTEC plus 837 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 to do if my Vaillant Boiler 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.
Why is there a dry fire in my Vaillant Boiler?
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 the flame goes off during operation of my Vaillant ecoTEC plus 837 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.
General| Model | ecoTEC plus 837 |
|---|---|
| Category | Boiler |
| Output | 37 kW |
| Dimensions | 720 x 440 x 338 mm |
| Flow Rate | 15.2 l/min |
| Mounting | Wall-mounted |
| Fuel Type | Natural Gas |
| ErP Heating Efficiency Class | A |
| ErP Water Heating Efficiency Class | A |
| Warranty | 5 years |
| Type | Combi |
| Efficiency | 89.3% |
Guidance on documentation, safety symbols, applicable documents, and CE marking for clarity and compliance.
Introduces ecoTEC combination and system boilers, highlighting their features, benefits, and general notes.
Covers CE marking, gas council numbers, and general installation requirements for safety and regulatory compliance.
Comprehensive technical specifications including heat output, dimensions, electrical data, and performance metrics for ecoTEC models.
Diagrams illustrating boiler dimensions and function elements for installation planning and component identification.
Requirements for water circulation systems, filling, electrical supply, and safety precautions.
Instructions for safely transporting, unpacking, mounting the boiler, and fitting the hanging bracket.
Detailed steps for connecting gas, cold water, hot water, and flue systems, emphasizing safety.
Details on electrical connections, wiring diagrams, control panel overview, and accessory connections.
Procedures for preliminary electrical, gas, and water checks, and filling/bleeding the heating system.
Steps for filling the heating system, checking pressure, and using the filling loop for ecoTEC plus boilers.
Procedures for checking gas supply pressure and rate, and refitting the boiler case.
Guides on adjusting central heating output, gas changeover, and performing initial functional checks.
Steps to verify correct operation of heating and hot water functions, using status displays.
Procedures for final system flush, handing over to the user, and explaining operation and maintenance.
Safety instructions and recommendations for initial boiler inspection and routine maintenance tasks.
Overview of annual inspection and maintenance tasks, including checks for flue, burner, and heat exchanger.
Detailed procedures for removing, cleaning, and refitting the burner module and its components.
Instructions for cleaning the condensate siphon and checking the expansion vessel pressure.
A systematic guide to troubleshooting common boiler faults before consulting specific fault codes.
Explanation of status codes and diagnostic codes to identify appliance operating conditions and faults.
A comprehensive list of fault codes, their meanings, causes, and how to access the fault memory.
Critical safety instructions to follow before replacing any boiler component to prevent damage or injury.
Step-by-step guides for replacing major components like the burner, fan, gas valve, and heat exchanger.
Guidance on proper recycling, disposal of the appliance, and information on Vaillant service.
Regulations, standards, and planning considerations for 60/100mm air/flue duct layout and termination accessories.
Maximum flue lengths for ecoMAX/ecoTEC, and installation guides for sliding sleeves, horizontal, vertical, and terminal kits.
Instructions on how to add extensions and elbows to the 60/100mm air/flue duct system.
Regulations, standards, and planning considerations for 80/125mm air/flue duct layout and termination accessories.
Maximum flue lengths for ecoMAX/ecoTEC, and installation guides for connection pieces, sliding sleeves, horizontal, and vertical ducts.
Instructions on how to add extensions and elbows to the 80/125mm air/flue duct system.
Overview of appliance features, safety precautions, emergency procedures, and intended use of the ecoTEC boiler.
Guide to operating the boiler, including control panel overview, initial checks, and turning the boiler on.
Instructions for setting domestic hot water temperature, warmstart function, and heating operation.
Understanding status displays, troubleshooting common issues, and turning off the boiler.
Information on frost protection features and the importance of regular maintenance and customer service.
