Gas Safe registered engineers have a responsibility to advise
you when they find dangerous gas installations in your
Their actions are determined by the requirements of the Gas Safety
(Installation & Use) Regulations and the guidance given in the
Gas Industry Unsafe Situations
When a registered gas engineer identifies an unsafe situation
they should try to find the cause and repair any faults. Where this
is not possible they should tell you that the fault(s) should be
repaired before the installation is used again. If it can’t be
corrected immediately they should make the installation safe, after
first seeking your permission to do so. This is normally done by
disconnecting or by turning off the gas to the affected part of the
installation. This will be dependent upon how bad the defects
If your engineer has identified a gas related danger in your
home they will attach a warning label to the
dangerous gas fitting and give you a warning notice. These should
show you a 'defect category'.
There are three categories depending on how bad the defects are.
Depending on the level of risk there will be different actions you
(or your landlord) should take.
‘Immediately Dangerous’ (ID)
An “immediately dangerous” installation is one which, if
operated or left connected to a gas supply, is considered to be an
immediate danger to life or property.
The installation will be disconnected, with your permission, and
must not be used until the necessary work has been carried out to
repair the defect(s). If you continue to use an immediately
dangerous installation you could be putting you or your family’s
lives in danger.
If you refuse the gas engineer permission to disconnect the
installation or an individual appliance, they will report the
situation to the Gas Emergency Service Provider (ESP). The ESP has
legal powers to demand entry to make the situation safe or may
disconnect the gas supply to the property.
‘At Risk’ (AR)
An “at risk” installation is where one or more recognised faults
are present which could constitute a danger to life or property
without further faults developing.
With your permission, the installation will be turned off and
should not be used again until the fault has been repaired.
‘Not to Current Standards’ (NCS)
Over time, industry standards may change and, as a result,
existing installations may not always meet the current safety
requirements. A “not to current standards” installation is one
which does not meet with current standards, but is safe. You may
however wish to improve the installation to meet current standards
as this could improve the reliability and lifespan of the
installation. If the installation has been carried out recently,
you should contact the registered gas business that carried out the
work to correct any identified faults. For older installations your
gas engineer can advise you whether the installation should be
brought in line with current standards.
It is always a good idea to bring an installation up to current
standards, but that will often depend upon whether the work can be
undertaken at reasonable cost, or whether any other work is likely
to be carried out on the installation in the near future, such as a
Concern for Safety
If the Gas Emergency Service Provider has visited a property as
a result of a smell of gas or fumes and cannot confirm the
installation is safe, they may use a further category – ‘Concern
for Safety’ and issue an appropriate notice.
Where a ‘Concern for Safety notice has been issued by the Gas
Emergency Service Provider, you will be told not to use the
installation until it has been checked by a Gas Safe registered
engineer. It is your (or your landlords) responsibility to get the
installation checked. Do not use the gas appliance until it has
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