Emergency
You can smell gas indoors: this is an emergency call to the National Gas Emergency Service, not a job to book in.
A CO alarm in alarm means a gas appliance may be spilling poisonous gas you cannot see or smell.
High risk
A gas hob burner that should burn crisp blue is burning yellow: a classic sign of incomplete combustion.
Caution
The burner clicks and you can hear gas, but nothing catches, or it lights and dies as soon as you let go.
Sooty or yellow-brown staining on or above a gas fire means combustion products are getting into the room.
A standing pilot on a fire, back boiler or water heater lights, then blows out minutes or hours later.
Nothing gas-fired will run (no hob, no fire, no boiler), and the problem is upstream of the appliances.
The meter dial or digits are moving with every appliance off, or the readings do not match what you are using.
An engineer has attached a warning notice and turned your boiler, fire or cooker off: here is what that classification means.
The annual check on a rented property has lapsed, or you cannot find the record for appliances you rely on.
Describe the job and get a fixed price from a local gas engineer.
