Technical data
Inspection and maintenance
56 Installation and maintenance instructions ecoTEC plus 0020116700_06 
12
12  Inspection and maintenance
After servicing, complete the relevant Service Record sec-
tion of the Benchmark Checklist located on the inside back 
pages of this document.
12.1 Inspection and maintenance intervals
a
  Danger!
Risk of injury and risk of damage to prop-
erty due to neglected inspection and 
maintenance!
Neglected inspection and maintenance 
works or not observing the stated inspec-
tion and maintenance intervals can inter-
fere with the operational safety of the 
boiler and can result in damage to property 
and to persons.
 > Point out to the operator that he must 
observe the demanded inspection and 
maintenance intervals as a minimum.
 > Carry out proper regular inspections 
once a year.
 > Carry out regular maintenance as dic-
tated by findings during the inspection 
process.
a
 Danger!
Danger of life and limb due to improper 
inspection/maintenance!
Inspections/Maintenance work carried out 
improperly can result in leakages and explo-
sion.
 > The boiler may only be inspected/main-
tained by a competent person.
All service work must be carried out by a competent person 
in accordance with the Gas safety, installation and use regu-
lations. In the UK this is considered to be a person approved 
at the time by the Health and Safety Executive.
In addition BS 6798: 2009 "Specification for installation 
and maintenance of gas-fired boilers of rated input not 
exceeding 70kW net" advises that:
 – The person carrying out a combustion measurement 
must be assessed as competent in the use of a flue gas 
analyser and the interpretation of the results.
 – The flue gas analyser used must be one meeting the 
requirements of BS7927 or BS-EN50379-3 and be cali-
brated in accordance with the analyser manufacturers’ 
requirements.
 – Competence can be demonstrated by satisfactory com-
pletion of the relevant ACS standard assessment, which 
covers the use of electronic portable flue gas analysers’ 
in accordance with BS7967, parts 1 to 4.
 – The flue gas analyser is set to the correct fuel setting.
We recommend the conclusion of an inspection and mainte-
nance contract with an approved company or installer.
The inspection serves to determine the actual condition of 
the respective boiler and compare it with the specified con-
dition. This is done by measuring, checking and observing.
Maintenance is required in order to eliminate any deviations 
of the actual condition from the specified condition.
This normally is done by cleaning, adjustment and, if neces-
sary, replacing individual components that are subject to 
wear.
You must carry out an annual inspection of the Vaillant 
 ecoTEC.
The annual inspection can be effectively performed without 
removing components by requesting data from the DIA sys-
tem, carrying out the simple visual checks indicated in 
¬table12.3 and performing a flue gas measurement.
The maintenance intervals and their scope are determined 
by the heating engineer based on the condition of the 
boiler found during the inspection.
All inspection and maintenance work should be performed in the 
order specified in ¬table12.3.
a
 Danger!
Risk of poisoning and burns caused by 
escaping hot flue gas!
Hot flue gas can escape and cause poison-
ing and burns if the boiler is operated with 
an incompletely mounted or open air/flue 
gas duct or if the boiler is operated with 
internal leaks with the front casing open.
 > Operate the boiler
- for commissioning
- for testing purposes
- in continuous operation
only when the front casing is fitted and 
closed and the air/flue gas duct is com-
pletely mounted.
 > Exclusively for test purposes such as gas 
working pressure testing the boiler may 
be operated with the front casing 
removed for short durations ONLY but 
must have a completely mounted air/flue 
gas duct.
12.1.1 General inspection and maintenance 
instructions
To ensure the faultless operation, long term availability of 
all functions and long working life of your Vaillant boiler 
and to prevent modifications to the approved series status 
only genuine Vaillant spare parts must be used when carry-
ing out inspection, maintenance and repair work.
For an overview of the available original Vaillant spare 
parts, contact the Vaillant sales office on 0870 6060 777.










