Vaillant ECOTEC PLUS VU 80 User Manual

Vaillant ECOTEC PLUS VU 80

76 pages

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Installation and maintenance instructions

For the competent person

GB, IE

Installation and maintenance instructions

ecoTEC plus

VU 80, 100, 120kW

Table of Contents

Default Chapter1
- Ecotec Plus1
- Table of Contents2
1 Notes on the Documentation3
- Storing Documents3
- Applicability of the Instructions3
- Identification Plate3
- CE Label3
- Type Overview4
- 1 Notes on the Documentation4
2 Safety5
- Safety and Warning Information5
- Intended Use5
- Basic Safety Information6
- General Requirements7
3 Unit and Functional Description11
4 Installation12
- Scope of Delivery12
- Transporting the Unit12
- Dimension Drawing and Connection Dimensions15
- Requirements for the Installation Site15
- Wall-Mounting the Boiler16
- Removing/Fitting the Front Casing16
5 Gas Installation17
- Preparing for Installation17
- Connecting the Gas Line17
6 Hydraulic Installation18
- Preparing for Installation18
- Connecting the Heating Flow and Heating Return19
- Connecting the Condensate Drain Pipework20
- Connecting the Discharge Pipe to the Expansion Relief Valve on the Heating Installation21
7 Flue Gas Installation22
- Preparing for Installation22
- Installing the Flue Pipe22
- Flue Gas Guiding Opening22
8 Electrical Installation24
- Preparing for Installation24
- Opening/Closing the Electronics Box24
- Establishing the Mains Connection and Connecting the Pump Group24
- Connecting the Controller26
- Connecting Additional Units27
- Connection Wiring Diagram28
9 Establishing Operational Readiness29
- Reading the Temperature or Pressure Display29
- Preparing the Heating Water29
- Filling and Purging the Heating Installation29
- Preventing Low Water Pressure30
- Filling the Condensate Siphon31
- Checking the Gas Ratio Setting31
10 Operation33
- Calling up the Installer Level33
- Overview of the Menu Structure34
11 Start-Up36
- Switching on the Boiler36
- Installation Assistant36
- Appliance Configuration and Diagnostics Menu37
- Using Test Programmes37
- Checking the Function of the Boiler38
12 Adapting the Unit to the Heating Installation39
- Overview of the Parameters in the Diagnostics Menu39
- Handing the Boiler over to the Operator43
13 Inspection and Maintenance44
- Inspection and Maintenance Intervals44
- Inspection and Maintenance Work48
- Using the Function Menu49
- Removing/Fitting the Upper Casing50
- Carrying out Maintenance Work50
14 Troubleshooting55
- Contacting Vaillant Customer Service55
- Performing Diagnostics55
- Using the Function Menu61
- Running Check Programmes61
- Resetting Parameters to Factory Settings61
15 Replacing Components62
- Preparing for and Completing Replacement Work62
- Removing/Fitting the Side Section (if Required)62
- Replacing the Gas Valve63
- Replacing the Burner63
- Replacing Insulating Mats64
- Replacing the Fan64
- Replacing the Heat Exchanger64
- Replacing the PCB And/Or the Display65
- Ending Repairs65
16 Decommissioning66
- Temporarily Shutting down the Boiler66
- Permanently Decommissioning the Boiler66
- Disposing of the Boiler66
17 Vaillant Commercial Service66
18 Technical Data67
19 Glossary68
20 Appendix69

Questions and Answers:

M
Mrs. Amy WeaverAug 21, 2025
What to do if the Vaillant ECOTEC PLUS VU 80 shows a low water pressure safety switch-off?
- A
  andersonjulieAug 21, 2025
  If the Vaillant Boiler experiences a low water pressure safety switch-off, it could be due to several reasons: * There may be insufficient water in the boiler. * The water pressure sensor might be defective. * The cable to the pump or water pressure sensor could be loose, disconnected, or defective. To resolve this, ensure there is adequate water in the boiler and check the sensor connections.
B
brandon27Aug 23, 2025
Why Vaillant ECOTEC PLUS VU 80 Boiler fails during start-up with unsuccessful ignition?
- L
  Lynn Fields MDAug 23, 2025
  If your Vaillant Boiler fails to ignite during start-up, it could be due to: * A defective gas meter or triggered gas pressure monitor. * Air in the gas line. * Low gas connection pressure. * A triggered thermal isolator device (TAE). * A blocked condensate duct. * Incorrect gas restrictor or ET gas valve. * Failure at the gas valve. * Incorrectly plugged multiple plug on the PCB. * A break in the cable harness. * A defective ignition system (ignition transformer, cable, plug, electrode). * Interrupted ionization current. * Incorrect boiler earthing. * Defective electronics. Check the gas supply and inspect the ignition components to resolve this issue.
M
Melissa YuAug 25, 2025
What to do if Vaillant ECOTEC PLUS VU 80 shows safety switch-off because temperature difference is too great?
- H
  Harry PollardAug 25, 2025
  If the Vaillant Boiler experiences a safety switch-off due to a temperature difference that is too great, possible causes include: * A blocked pump. * Insufficient pump output. * Air in the boiler. * Flow and return NTC interchanged. Inspect and clear the pump, and check for air in the system to address this issue.
A
allenianAug 27, 2025
Why Vaillant Boiler shows safety switch-off with temperature rising too fast?
- H
  hparrishAug 27, 2025
  If the Vaillant Boiler experiences a safety switch-off because the temperature rise is too fast, it could be due to: * A blocked pump. * Poor pump performance. * Air in the boiler. * System pressure being too low. * A blocked or incorrectly installed non-return valve. Inspect the pump function and clear any blockages to resolve this.
A
Anna BrownAug 27, 2025
How to fix a fan fault on a Vaillant ECOTEC PLUS VU 80 Boiler?
- A
  Andrew DownsAug 27, 2025
  If there's a fan fault in your Vaillant Boiler, the causes might be: * The plug on the fan is not correctly plugged in. * The multiple plug on the PCB is not correctly plugged in. * There's a break in the cable harness. * The fan is blocked. * The Hall sensor is defective. * The electronics are defective. Inspect the fan connections and ensure it is free from blockages.
P
perezaaronAug 29, 2025
What to do if Vaillant ECOTEC PLUS VU 80 Boiler fails during operation and re-ignition is unsuccessful?
- C
  clayton53Aug 29, 2025
  If the Vaillant Boiler fails to re-ignite during operation, the problem may be caused by: * A temporary interruption of the gas supply. * Flue gas recirculation. * A blocked condensate duct. * Faulty earthing of the boiler. * Spark failure of the ignition transformer. To solve this, ensure a proper gas supply and check for blockages.
S
Sarah PetersAug 31, 2025
Why does my Vaillant ECOTEC PLUS VU 80 have a temperature safety switch-off?
- N
  Nicole Bryant DVMAug 31, 2025
  If the Vaillant Boiler experiences a temperature safety switch-off, it may be due to: * Incorrect earth connection of the cable harness to the boiler. * If the burner cover safety cut-out triggers: a defective burner door seal or burner isolation. * If the flow safety cut-out triggers: a pump fault. To address this, check earth connections and inspect burner components.
J
Julie LawrenceSep 2, 2025
How to resolve a flue pipe fault on a Vaillant ECOTEC PLUS VU 80 Boiler?
- M
  Michael GreenSep 2, 2025
  If you're experiencing a flue pipe fault with your Vaillant Boiler, it's likely that the flue pipe is blocked. Clear any blockages in the flue pipe to resolve this issue.
M
Matthew PhillipsSep 3, 2025
What causes the Vaillant Boiler to safety switch-off when the flue gas temperature is too high?
- S
  Stacy WilliamsSep 3, 2025
  If the Vaillant Boiler experiences a safety switch-off because the flue gas temperature is too high, it could be due to: * A break in the plug connection for optional flue gas safety temperature limiter (safety cut-out). * A break in the cable harness. Inspect cable connections and wiring to resolve the problem.
H
Heather FriedmanSep 5, 2025
What to do if Vaillant Boiler shows short circuit with flow sensor?
- M
  Matthew LamSep 5, 2025
  If the Vaillant Boiler displays a short circuit with the flow sensor, it could be due to: * A sensor plug having a short to the casing. * A short-circuit in the cable harness. * A faulty sensor. Inspect sensor connections and wiring to troubleshoot.

Vaillant ECOTEC PLUS VU 80 Specifications

General

Mounting	Wall-mounted
Protection rating	IPX4D
Type	Condensing
Fuel Type	Natural Gas
Electrical connection	230 V / 50 Hz

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