5 Common Furnace Repair Problems and How to Remedy Them


Even if we have a mild winter ahead of us, you’ll still need your furnace to get through the next few months. And the last thing you’ll want to do is wake up one day to a furnace that’s blowing cold air, or just not blowing at all.

Here are five of the most common HVAC repair issues your furnace might face this winter, and how to deal with them.

The problem: Your furnace just won’t switch on

Furnace burner flamesThere are several reasons why a furnace could refuse to start:

  • The flame setting in the pilot light is too low.
  • There may be issues with the pilot light – a faulty valve, loose/degraded thermocouple or housing that needs to be cleaned
  • The ignition needs to be reset. Turn your thermostat all the way down, shut off the power switch, then put the power back on with the thermostat set to room temperature.
  • It could simply be an electrical problem, such as a tripped circuit breaker or blown fuse.

The problem: Your furnace comes on, but isn’t producing enough heat

Clogged air filterClogged filters are among the most common reasons for poor furnace performance. Luckily, it’s an easy thing to check. Replacing your filter, as we’ve said time and again, is a major part of maintaining both the air quality in your home and the performance of your HVAC system.

When your filter becomes clogged, the air handler in your system has to work harder to send hot air through your home. This not only drives up your energy bill, the reduced air flow can overheat your heat exchanger and cause it to shut down early.

The problem: Your furnace is only blowing cold air

thermostatThere’s no one remedy for this issue, as it could be one of several culprits:

  • Your thermostat is set improperly
  • Your filter is clogged, leading the furnace to overheat
  • Your pilot light has gone out. If it stays lit, great. If it refuses to light, make sure the furnace is getting gas, and check to see if the pilot light is dirty. If the light won’t stay lit, you may need a new thermocouple, a job best left to a heating repair expert.
  • A dirty flame sensor or gas burner

The problem: Your furnace provides inconsistent heat

Man conducting heating repairAre some rooms in your home too warm while others are too cold? You could be dealing with:

  • An improperly insulated home
  • A furnace that’s either too big or too small for your house
  • Leaks or clogs in your ductwork
  • Problems with the fan motor

With issues like these, it’s best to consult with a heating and cooling repair professional to determine what’s causing your furnace to heat inconsistently.

The problem: Your furnace is making weird noises, or emitting a weird smell

We should say up front that if you smell gas after turning on your furnace, you’re dealing with a dangerous situation.

Don’t touch any electrical switches or light matches. Shut off the gas supply valve on your gas meter if you can, take your family outside, and call the fire department or your gas company.

A noisy furnace might sound worse than it really is. Whistling or rattling sounds could be a sign of things that can be addressed with regular maintenance.

If you’re dealing with any of the hvac repair issues we’ve listed here, it’s time to call All Seasons Comfort Control. Our HVAC experts can diagnose whatever may be wrong with your furnace and offer regular maintenance to keep you and your family warm this winter.