It looks like you're starting to form a sentence but it's incomplete. If you're trying to say that someone dialed a phone number because there was a fire at the house, you might complete the sentence like this:

"He dialed 911 because the house was on fire."

In many countries, including the United States and Canada, "911" is the emergency telephone number used to alert police, fire departments, and medical professionals in case of an emergency. If you're referring to another country, the emergency number might be different. For example, in the UK, it's "999," and in Australia, it's "000."