Furnace Repair in Germantown, Gaithersburg and Rockville
When your furnace stops heating, you want a straight answer about what failed and what it will take to fix it. Mora Heating & Air repairs gas and propane furnaces in Germantown, Gaithersburg, Rockville, Montgomery Village, Derwood, Olney and Boyds. We diagnose the actual fault, explain it in plain language, and put your options in writing before any work begins.
Most furnace failures trace back to a short list of causes: ignition components, flame sensors, blower motors, control boards, and safety switches. We carry common parts and service most furnace brands. If your furnace is near the end of its life, we will tell you plainly and explain what repair versus replacement looks like for your specific situation.
Common Furnace Problems We Repair
Modern furnaces shut themselves down for a reason. A furnace that will not start, will not stay running, or blows cold air is usually protecting itself from a specific fault. These are the failures we find most often, from the Whetstone townhomes in Montgomery Village to the 1970s houses in Derwood and Olney.
Ignition and flame sensor failures
Hot surface igniters wear out and flame sensors build up residue over time. Either one will keep a furnace from firing or cause it to shut down seconds after starting. Both are common, well-understood repairs.
Blower motor problems
A failing blower motor or capacitor means the furnace makes heat but cannot move it. Symptoms include humming without airflow, grinding noises, and overheating shutdowns. We test the motor and capacitor before recommending replacement of either.
Short cycling and limit switches
A furnace that starts and stops every few minutes is usually overheating and tripping its high-limit switch. The root cause is often a clogged filter, blocked return, or failing blower rather than the switch itself. We fix the cause, not just the symptom.
Thermostat and control faults
Sometimes the furnace is healthy and the thermostat, wiring, or control board is the real problem. We test the full control chain so you are not paying to replace parts that were never broken.
What Happens During a Furnace Repair Visit?
Your tech starts with what you tell him. Then he watches the furnace start, step by step, from the thermostat call through lighting to the blower. He finds where it stalls instead of guessing. We also measure airflow, gas pressure, and how much the air heats up while we are there, because those readings often point straight to the underlying cause. In Derwood and Olney we are usually looking at a third system in the same house, and each changeover left something behind: a duct transition that does not quite fit, a return nobody enlarged, a flue adapted rather than replaced. That history is often where the fault is hiding.
Before any repair work begins, you get a plain-language explanation of what failed, why it failed, and what the repair involves, in writing. No work starts until you approve it. If we find a condition that makes the furnace unsafe to run, we will show it to you directly, not just tell you about it.
Repair or Replace: How We Help You Decide
There is no universal answer, but there are honest criteria. A furnace under ten years old with its first significant failure is almost always worth repairing. A furnace past fifteen years with a failing blower motor, control board, or the inducer fan deserves a harder look, because more failures tend to follow the first.
A cracked heat exchanger changes the conversation entirely. It cannot be safely repaired, and replacement of the furnace is the responsible path. When replacement is on the table, we will also walk you through the heat pump option, since replacing a furnace is the natural moment to consider one. We give you the facts and the tradeoffs. The decision stays yours.
Is Your Furnace a Safety Risk?
Gas appliances deserve respect. A cracked heat exchanger can allow combustion gases, including carbon monoxide, to mix with the air circulating through your home. Carbon monoxide is odorless, which is why every home with gas equipment needs working CO detectors on every level.
If you ever smell gas near your furnace, do not troubleshoot it. Leave the house, and call your gas utility or 911 from outside. Once the utility has made the scene safe, we can diagnose and repair the equipment. During every repair visit we inspect the heat exchanger, test for combustion leakage, and verify the safety controls are doing their job.
Propane Furnace Repair Beyond the Gas Mains
Parts of Boyds sit past the natural gas mains, on well and septic, where propane carries the heating load. Propane furnaces are close cousins of natural gas models. They run different orifices and different gas pressures, and often a different regulator. We service propane furnaces ourselves. We check the conversion parts are right. We set gas pressure to the maker's spec instead of trusting the last installer. Out there a return trip costs you a day rather than an hour, so we plan the parts before we drive.
What we check besides the broken part
A part that failed had a reason for failing. Low airflow. A dirty coil. A wire running hot. A drain backing up. If that reason is still there when we leave, the new part is on the same clock as the old one.
So the visit covers the rest of the system, not only the piece that quit. If we find something that was working against it, we tell you what it is and what it would take to put right.
Frequently asked questions
Why is my furnace running but not producing heat?
The most common causes are a failed igniter, a dirty flame sensor shutting the burner down after ignition, or a gas supply issue. The blower keeps running to clear the heat exchanger, so you feel airflow without warmth. A technician can watch the ignition sequence and identify the failed component directly rather than guessing.
Why does my furnace keep turning on and off every few minutes?
Short cycling usually means the furnace is overheating and tripping its high-limit switch. A clogged filter, blocked return vents, or a weakening blower motor are the usual root causes. Replacing the switch alone rarely solves it. Check your filter first; if the cycling continues with a clean filter, have the airflow and blower tested.
What should I do if I smell gas near my furnace?
Leave the house first. Do not flip switches, light anything, or try to find the leak yourself. Call your gas utility or 911 from outside the home. Utilities respond to gas odor reports around the clock over the phone to you. Once the utility has made the home safe, call us to diagnose and repair the equipment.
Is it worth repairing a fifteen-year-old furnace?
It depends on what failed. A modest repair like an igniter or flame sensor can be reasonable even at that age. On a furnace that old, a big part going out is worth a talk about repair against replace. That means the blower motor, the control board, or the inducer fan. More failures tend to follow the first one. A cracked heat exchanger means replacement, full stop.
Do you repair propane furnaces?
Yes. Propane is common past the gas mains, including parts of Boyds. Propane gear runs different orifices and gas pressures than natural gas. We check those details on every visit. We do not assume the first installer got it right, and we bring the likely parts with us, because a second trip out there costs you a day.
Can a bad thermostat make it seem like the furnace is broken?
Yes, and it happens often. Dead batteries, a wiring fault, or a failed thermostat can keep a perfectly healthy furnace from ever receiving the call for heat. Before you assume the worst, replace the thermostat batteries and confirm the settings. During a repair visit we test the entire control chain so the diagnosis lands on the true fault.
Where do you repair furnaces?
Fourteen towns: Clarksburg, Boyds, Germantown, Montgomery Village, Washington Grove, Gaithersburg, Darnestown, Derwood, Redland, North Potomac, Travilah, Rockville, Potomac and Olney. If your address is not on that list, say so when you call and we will tell you straight rather than send a truck.
No heat, strange noises, or a furnace that will not stay running? Call Mora Heating & Air and we will get a technician scheduled.
Or tell us what your system is doing
Send us the details and we will call you back. If the house is very hot or very cold right now, calling is faster.