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Check smoke detectors in the area. Heatilator fireplaces that don't have a remote generally don't beep.
The fireplace not turning on via the switch is likely due to a weak thermopile (flame sensor in the pilot flame) not putting out enough voltage to overcome the resistance in the wiring to the switch. The thermopile generates all the power to operate the gas valve. As they age the voltage output drops. I'd replace the thermopile. As far as the beeping goes I've never heard of any fireplace that didn't have a remote beep. If you can provide the model number I can do some research into this.
If you don't have a remote there's nothing on this model that beeps.
Do you have a remote? was there ever a remote conneted to this unit?
I'm going to open this up to my colleagues so one of them can help. Please don't respond (even to acknowledge this post)until you get a response from us. If you respond first it will only delay your answer.