What to do if my Vaillant Boiler drinking water outlet probe stopped?
If the drinking water outlet probe has stopped on your Vaillant Boiler (800 series only), the NTC-connector might not be plugged in or is loose, the NTC is defective, the multiconductor on the electronics is not plugged in correctly, or the cable is defective. Ensure the NTC connector is plugged in, check the multiconductor connections, and replace defective cables.
How do I fix a short circuit in the return NTC of my Vaillant ecoTEC plus Boiler?
If your Vaillant Boiler shows a short circuit in the return–NTC, it could be because the NTC plug is shorted to the casing. Check the NTC plug connection.
How do I fix a short circuit in the flow NTC of my Vaillant ecoTEC plus?
If your Vaillant Boiler shows a short circuit in the flow–NTC, it could be due to the NTC plug being shorted to the casing or the NTC being defective. Check the NTC plug connection and replace the NTC if it is defective.
What does it mean if my Vaillant ecoTEC plus displays flow and/or return sensor fault?
If your Vaillant Boiler displays a flow and/or return sensor fault, it indicates that the flow and/or return sensor is defective. Replace the flow and/or return sensor.
What does it mean if my Vaillant Boiler displays electronics or sensor fault?
If your Vaillant Boiler displays an electronics/sensor fault, it indicates a short-circuit in the flow or return sensor, or the electronics are defective. Check and replace the flow or return sensor.
What to do if my Vaillant Boiler system pressure is too low?
If the system pressure of your Vaillant Boiler is too low, the suggested solution is to top up the water.
What does it mean if my Vaillant ecoTEC plus Boiler shows a gas–valve control – defective?
If your Vaillant Boiler shows a gas–valve control – defective, it indicates a short circuit or earth (ground) leak in the cable loom to the gas valves, a defective gas valve assembly (earth/ground leak from coils), or a defective electronic control system. Check and replace the gas valve assembly and any faulty wiring.
What does it mean if my Vaillant Boiler shows a gas–valve control defective?
If your Vaillant Boiler shows a gas–valve control defective, it indicates a short circuit or earth (ground) leak in the cable loom to the gas valves, a defective gas valve assembly (earth/ground leak from coils), or a defective electronic control system. Check and replace the gas valve assembly and any faulty wiring.
What to do if my Vaillant Boiler fan speed varies too high on start?
If your Vaillant Boiler's fan speed varies too high on start, it could be due to blocked fans, the plug not being 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 replace any faulty components.
Why does my Vaillant Boiler have a secondary light issue?
If your Vaillant Boiler has a secondary light issue, where the ionization signal reports a flame even when the gas valve is off, it could be due to defective gas solenoid valves or a defective flame detector. Check the gas solenoid valves and replace them if they are defective.
General| Model | ecoTEC plus SERIES |
|---|---|
| Mounting | Wall-mounted |
| Fuel Type | Natural Gas / LPG |
| ErP Heating Efficiency Class | A |
| NOx Class | 5 |
| Category | Boiler |
| Type | Condensing |
| Efficiency | Up to 94% |
| ErP Water Heating Efficiency Class | A |
Classifies warnings by danger severity using symbols and signal words.
Specifies the product's intended purpose for heating and hot water generation.
Provides essential safety guidelines for installation, operation, and maintenance.
Covers risks like flue gas, flammables, modifications, air supply, corrosion, frost, and improper maintenance.
Detailed explanation of the operator control panel symbols and functions.
Outlines the basic principles and operator control elements for product operation.
Guidance on identifying and fixing common faults.
Instructions for routine maintenance, cleaning, and checking components.
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