A family woke to a silent furnace and −28°C outside. Heat was back the same night.
The emergency line rang before dawn. No heat, two kids, and a furnace that had locked out after a power blink.
The on-call tech found a failed control and a pressure switch that would not prove. Both were on the truck. Safety checks first, then heat.
The house was climbing within a couple of hours. We left a note on why the lockout happened and what to watch after the next storm.
After-hours parts and a house that could not wait until morning.
Heat restored overnight with a documented follow-up.
Previous