This is just a few of the many tests required to ensure your home is up to scratch and gas safe. If any of these fail your appliance could be unsafe to use. And just because you don’t see, smell or taste carbon monoxide, doesn’t mean it’s not there.
It’s called the ‘silent killer’ for a reason. And if you don’t already have one, get a CO alarm fitted near every solid fuel appliance you have.
When it comes to gas, be safe!