What does it mean if my Vaillant ecoTEC plus 837 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 Boiler 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 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.
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 my Vaillant ecoTEC plus 837 Boiler 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 837?
An EEPROM error indicates that the electronics are defective. Replace the defective electronics.
What does it mean if my Vaillant ecoTEC plus 837 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 837 Boiler 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 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.
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.
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% |
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