You need to be sure your electrical equipment is safe.
In regards to a fixed appliance it should have been installed by a competent person, such as an electrician, and you should have paperwork to confirm that. That may suffice, but it is up to you to make sure you have documentation to confirm the appliance is safe.
The appliance may also get maintained, by the installation company or another, and again you need to make sure you have paperwork for this; does the maintenance include checking the electrics?
You need to visually inspect the appliance.
If you have contracted us to do your PAT testing, it is not our place to test all your fixed appliances too, but what we do do is check any appliances that would have been supplied with a plug which are now hard wired. This includes white goods like fridges and washing machines, heaters on walls, Televisions, projectors, extractor fans, ovens etc.
We will visually inspect them, and run an earth continuity test on them.
(We do not do checks on appliances that wouldn’t have had a plug originally, as these are outside our scope and usually will be maintained by specialist companies, such as air conditioning, escalators, toilet hand driers, etc).
We can’t do tests for insulation resistance or check the wiring without turning off the power and opening the spur; as you have not contracted us to do that, we are not insured to do so, but we can arrange it for another time.
After our initial assessment we will recommend further action; if the appliance has not been tested since it was installed, and that was 3-5 years ago, we will recommend a full test be carried out. We can do this for you or you can get an electrician to do it. Usually its done on the same frequency as your EICR.
This can only be done when the power can be turned off, because the wires for the appliance need removing to conduct the tests.