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Do you think commas were needed as I get confused where to put them most of the time? So I tend to ignore to be on the safe side.
He wasn't sure what the issue is but had advised to contact the engineer to check the fire panel. It keeps beeping and we have no access to the panel as the password has been changed. The residents are getting frustrated. We require an engineer on-site urgently to silence the panel.
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He wasn't sure what the issue was but advised us to contact the engineer to check the fire panel. It keeps beeping, and we have no access to the panel because the password has been changed. The residents are getting frustrated. We require an engineer on-site urgently to silence the panel.

Goldenboy1I tend to ignore to be on the safe side.

That is not the safe side and not an intelligent decision. Please study commas more carefully. There is plenty of information on line:

http://grammar.ccc.commnet.edu/grammar/commas.htm

https://owl.english.purdue.edu/owl/resource/607/02

https://www.iue.edu/hss/writingcenter/documents/Commas.pdf

https://webapps.towson.edu/ows/modulecomma.htm

http://www.massasoit.edu/Assets/documents/writing-center/comma-usage-handout.pdf

et cetera.

Comments  
Thank you for your response. Have checked the link you sent. It is really helpful, but a little bit complicated at the same time.