For more than 100 years the FPEs have refused to acknowledge that when "code book engineering" is applied to the fire problems in America; if the code is flawed and corrupted the "engineering" will be flawed and corrupted. Of course it is necessary for the FPEs to earn a living and it is easier to prosper when performing as loyal followers of the NFPA code system.
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Comments: 2
I had a powervent just once - never again. If God had intended it to be necessary for smoke to go sideways he would not have made it rise, naturally.
I has gotta be something on the thermostat/relay side of the control box. You might need to replace the whole electronics package to fix it quickly.
Is there any place
Possibly the vent pipe termination on the outside of your house is freezing up with ice.
If the unit works during the day without any problems --and you have a programmable thermostat I would check the evening -night time settings maybe thermostat is set for cooler temperature--