Furnace Repair in Rockaway & Morris County, NJ
Won't Ignite · Short Cycling · Blower Failure · No Heat

Common Furnace Problems We Repair

Match what your furnace is doing to the symptoms below — then call (908) 878-6479 for a same-day diagnostic.

Why won't my furnace ignite?

A furnace that clicks, tries, and fails to light is one of the most common no-heat calls we run. On modern gas furnaces the usual culprit is a dirty or failed flame sensor — a small rod that confirms the burner actually lit. When it's coated with residue it can't sense the flame, so the control board shuts gas off after a few seconds as a safety measure. Other frequent causes are a cracked hot-surface igniter, a failed gas valve, a closed gas supply, or a thermostat that isn't calling for heat. On oil furnaces it's often the igniter electrodes, the cad cell, or a nozzle and pump issue. Our technicians test the full ignition sequence — igniter, flame signal, gas pressure, and safety lockouts — rather than swapping parts on a hunch. A flame-sensor cleaning is usually a same-visit, under-$200 fix, and it's the same careful diagnostic we bring to every heating repair across the county.

Why is my furnace short cycling?

Short cycling — the furnace turning on and off every few minutes without finishing a heating cycle — wears equipment out and drives up gas bills. The number-one cause in Morris County homes is a dirty air filter choking airflow, which overheats the heat exchanger and trips the high-limit switch. Other causes include a failing limit switch, a flame sensor dropping the flame mid-cycle, an oversized furnace that heats the thermostat too quickly, a blocked flue, or a thermostat mounted in a hot spot such as near a supply register or in direct sun. Start by checking your filter — if it's more than 90 days old, replace it. If the cycling continues, we'll trace airflow, verify the limit and pressure switches, and inspect the heat exchanger before recommending a repair. Chasing the root cause instead of the symptom is what keeps a $150 fix from turning into a $600 one.

Why is my furnace blower not working (or running non-stop)?

If the burners light but no warm air moves — or the blower runs constantly and never shuts off — the problem is on the air-handling side. A blower that won't start often points to a failed blower motor, a bad run capacitor, a seized bearing, or a cracked blower wheel; a control-board or relay fault can also cut power to the motor. A blower that never stops is usually a thermostat set to "fan ON" instead of "AUTO," a stuck fan-limit switch, or a control-board issue. Because a furnace running with poor airflow can overheat and trip on the limit switch — the same chain that causes short cycling — airflow problems are worth diagnosing quickly. We test the motor, capacitor, control board, and fan-limit switch, then give you a written repair-or-replace recommendation for the exact part that failed rather than a vague estimate. The blower is the same air handler your cooling system depends on, so if you also notice weak airflow in summer, ask us to check the air conditioning side on the same visit.

Why do I have no heat at all?

A completely dead furnace — no ignition, no blower, no response — usually traces to power, controls, or a safety lockout. Check the basics first: the furnace switch (it looks like a light switch near the unit), the breaker, the thermostat batteries, and, on gas systems, that the gas is on. Beyond that, a furnace will refuse to run if a safety device has locked it out: a tripped high-limit switch, a blocked pressure switch, a flame-sensor lockout after repeated failed ignitions, or a blown low-voltage fuse on the control board. On oil furnaces, a tripped reset button on the primary control is common — press it once; if it locks out again, stop and call us, because repeated resets flood the chamber with oil. If the house is genuinely cold and dropping, this is exactly what our 24-hour line is for. We dispatch around the clock to Rockaway and every town nearby, so call (908) 878-6479 and we'll roll a truck.