HP fax error 388 is a communication issue which usually occurs when the machine is not properly connected to the phone line. You can check the lines and connections if you continue to face hp fax error 388. Go through the following tests to perform a fax test-
ü Go to control panel and click on ‘Fax’ and then select ‘Setup’
ü Click on ‘Tools’
ü Select ‘Fax Test’ and the printer will keep you posted regarding the status
ü You will then get a print of the requested test document which you can examine as per your convenience
This is how you can run a fax test if you are facing hp fax error 388. Get in touch with us if you require assistance.