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Hi, I'm a little confused by this.If you remove the cover on a lot of modern Boilers, you disturb the seal that makes the appliance 'room sealed' as has previously been said.
Room sealed means it is fairly well sealed from the room the appliance is situated in. The appliance draws air for combustion from outside.
Due to the volume of air that can be pulled down the air intake section of the flue pipe the appliance will burn differently with the case off than it will with the case on. When the case is on, there is a slightly negative pressure inside as only a measured amount of air can enter the appliance. Without the case there is more air available because there is less restriction. That alters the pressure inside the appliance and in turn this alters the products of combustion from the appliance.
The reason you are supposed to be Gas Safe Registered is because you are supposed to be considered 'competent' in testing how the appliance is performing after it has been worked on, meaning that you 'know' it was left burning safe.
On most modern Boilers the seal is also the insulating material inside the front cover.
Hope that reads right and makes sense!
I apologize in advance for my ignorance, I'm competent at general plumbing but not gas trained in any way so please bear with me.
Most of the boilers I electrically connect up (mainly combi ones) the front access cover is just hooked on a couple of pins at the top and held back by a couple of screws at the bottom. I haven't come across any type of seal in these instances. This cover just appears to be a shield rather than an integral part of the boiler? in fact the boiler is open to the room from underneath anyhow even when the cover is in place and I have often come across boilers with this cover left off (not good practice I know but no one seemed over concerned about it).
I certainly wouldn't even attempt to remover a cover that was clearly part of a sealed chamber.