Heat not working: furnace & heat pump checks for NJ & NYC winters

Heating failures in North Jersey and NYC often show up first as lukewarm vents, a blower that never stops, or error flashes on a smart thermostat. Verify the thermostat is in “heat” mode and the temperature is set above room air. If you have a heat pump, confirm “emergency heat” or “aux” is only used when recommended—running aux long-term without diagnosis can mask a failed outdoor unit.

For gas furnaces, listen for the inducer motor and ignition sequence. A rapid click with no flame may mean a dirty flame sensor or failed ignitor—both are routine repairs, but gas valves and heat exchanger issues must be handled by licensed professionals. If you smell gas, leave the building and call your utility from a safe location; do not use switches or phones inside.

Heat pumps in Bergen and Essex suburbs frequently struggle when outdoor coils ice during defrost failures or when reversing valves stick. Ice buildup on the outdoor unit in mild drizzle can be normal during defrost cycles; solid ice that never clears is not. Never chip ice off coils with tools—you can damage fins and cause leaks.

Steam radiators and hydronic systems in parts of Hudson County and NYC brownstones are a different trade path, but many condos still use PTACs or vertical stack heat pumps. Know your system type before opening access panels; mislabeled breakers and shared metering confuse emergency troubleshooting in multifamily buildings.

If the system runs but rooms stay cold, duct leakage, balancing dampers, or inadequate return paths are common in renovated row houses and split-levels. A technician should measure supply/return temperatures and static pressure before suggesting major parts replacements.

Document the LED fault code from the furnace door chart or thermostat app. That single step often cuts diagnostic time in half for service routes serving Paramus, Union City, Montclair, or Upper Manhattan.