A furnace that refuses to start on a cold New York City winter night is an urgent problem that needs fast attention. Before calling for emergency service, there are several checks you can perform that resolve the issue surprisingly often. Many furnace failures are caused by simple problems like a tripped breaker, a clogged filter, a thermostat issue, or a pilot light that has gone out. Walking through these common causes systematically can save you the cost of an emergency service call and get your heat restored in minutes. This guide covers gas and electric furnaces commonly found in NYC homes.
Make sure the thermostat is set to heat mode with the temperature set above the current room temperature. Replace the batteries if it has them. Try raising the temperature 5 degrees above room temperature to trigger the furnace to start.
Verify the furnace power switch, usually a standard light switch on or near the unit, is in the on position. Then check the circuit breaker panel for a tripped breaker. Reset it by flipping it fully off and then back on. For gas furnaces, verify the gas valve is open.
A severely clogged filter can cause the furnace to overheat and trigger the high-limit safety switch. Remove and inspect the filter. Replace it if dirty, then try restarting the furnace by turning it off for 30 seconds and back on.
For older furnaces with a standing pilot light, look through the viewing window to see if it is lit. Follow the manufacturer instructions to relight it. For newer furnaces with electronic ignition, listen for clicking sounds indicating the ignitor is attempting to fire.
Most furnaces have a reset button, usually red, on the unit. Press it once and wait for the furnace to attempt a start cycle. If it fails to start after two reset attempts, do not keep pressing it. The issue likely requires professional diagnosis.
If the furnace will not start after checking power, filter, and pilot light, or if you smell gas at any point, call a professional immediately. Repeated lockouts indicate a failing component that requires expert diagnosis.
Call (646) 439-4057Clicking without ignition usually means the ignitor is firing but not producing a flame. This can be caused by a dirty or cracked ignitor, a closed gas valve, or a faulty gas valve solenoid.
Every 1 to 2 months during heavy use. In NYC winters when the furnace runs frequently, a monthly check is recommended. Hold the filter up to light and if you cannot see through it, replace it.
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