Furnace Repair

Gas or Propane Furnace Trouble? Start with the Diagnosis.

No heat on a cold night is no small thing. A gas or propane furnace that will not light, keeps shutting off, or blows cool air needs a real look. We come out, test the parts that matter, and tell you what is wrong and what it takes to fix it. Call or text and we will get on it.

HVAC Repair Equipment Installation Clear Written Scope
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What Furnace Repair Covers

A furnace may stop because its safety switches detect a problem. An ignition fault, airflow restriction, wiring issue or venting concern can cause similar symptoms. The fault code is a starting point for diagnosis, not proof of a failed part.

Mora Heating & Air works on home gas and propane furnaces. We tell you what we confirmed, your repair options, and anything we could not fully test. Your oil provider still handles all oil-furnace service and burner repair.

What This Covers

  • Reading the control board fault code and confirming it with actual readings instead of trusting the blink pattern alone
  • Ignition faults: hot surface igniters, spark ignition, gas valves that won't open
  • Flame sensor cleaning and testing to help find why the furnace is not heating
  • Pressure switch and inducer motor faults, including blocked or improperly pitched venting
  • Limit-control trips assessed for airflow, temperature and other possible causes
  • Blower motor, capacitor, and control board diagnosis
  • Heat-exchanger assessment appropriate to the equipment, with any inspection limits explained
  • Thermostat and low voltage wiring faults that present as a dead furnace
  • Relevant combustion or venting checks within the agreed diagnostic scope, with any testing limits explained

Signs Your Furnace Needs Attention

  • The furnace tries to light several times then stops and locks out
  • The blower runs but the air coming out is cool
  • It heats for a few minutes, shuts off, then starts again shortly after
  • A rumble, a boom, or a delay before it lights
  • The furnace runs but rooms that used to get warm no longer do
  • A flashing fault light visible through the sight window in the lower door
  • Gas odor: leave without operating switches and call the gas utility or 911 from outside

How We Work a No Heat Call

Safety comes before diagnosis

An active CO alarm or suspected exposure needs evacuation and a 911 call from outside. Gas odor needs an outside call to the utility or 911. Once emergency responders clear the property, qualified equipment assessment can follow.

We read the fault, then verify it

The board stores a code. That code is a starting point, not an answer. A pressure switch code can be a bad switch, a blocked vent, a cracked hose, or a failing inducer, and only readings tell you which.

We explain it in plain language

You hear what failed and why it failed, because the why usually matters more. A limit switch that tripped because of a clogged filter will trip again if nobody mentions the filter.

We repair, then we watch it run

After the approved repair, we check the relevant furnace operation as safe conditions permit. We explain any remaining concern or limit on testing.

Frequently Asked Questions

The fan setting, ignition sequence, a safety shutdown or another fault could be involved. The symptom alone does not establish the cause.
Repeated resets can hide the fault and restart unsafe operation. Leave troubleshooting to a qualified professional and report any displayed code.
No. The thermostat, airflow and equipment condition can also cause short cycling. Describe the symptom so the cause can be investigated.
A heat-exchanger assessment can be part of the diagnostic scope. We explain the inspection method, findings and any limits rather than diagnose it from flame appearance alone.
Leave the building without operating switches or investigating. From outside, call the gas utility or 911 and follow their instructions.
Get everyone outside to fresh air and call 911 from outside. Do not re-enter until emergency responders say it is safe.
We serve homeowners in Germantown, Gaithersburg and Montgomery Village. Call or text with the full service address and the work you need so we can confirm the request.
No. Furnace repair here covers residential natural-gas and propane equipment. Your oil provider handles all oil-furnace diagnosis, burner repair and maintenance.
It can be as simple as the thermostat on the wrong setting or the fan left running, or it can be a clogged filter, an ignition problem, or a safety switch doing its job. Check the thermostat and the filter first. If it is still blowing cold, leave it and call us, because a furnace that will not fire can mean something that should be looked at, not forced.
It comes down to three things: how old the system is, what the repair costs against the value of the whole unit, and how well it has been keeping up. Once a system is past its teens and the repairs start stacking, replacement usually makes more sense. We look at yours and tell you straight which way we would go if it were our own home, with no pressure either way. Call or text 301-355-2238 and we will walk through it.

Furnace Repair Across Germantown, Gaithersburg and Montgomery Village

We serve homeowners in Germantown, Gaithersburg and Montgomery Village.

Get a Quote

Tell Us
What You Need.

Tell us what the system is doing and where you are. A few photos from a safe spot help us get ahead of it before we arrive.

1
Tell us what is happeningWhat it is doing and when it started. A photo of the thermostat screen or the outdoor unit helps.
2
We call you backWe ask a few questions about the system and set up a time to come out.
3
You see it in writingYou get the work and the price in writing before we start. Sending this does not lock in an appointment on its own.
RepairFind the problem
ReplaceCompare the options
MaintainCare for your system
Ask anything before you decide. We tell you what we found and what we think it needs, in plain words, and you choose from there.

Or just give us a call.

301-355-2238

Call or text us about the heat or the AC

Clear answers. Clear scope.

Know what you are approving.

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Customer Feedback

Verified Google reviews, 5.0 from 44

WB
William Bonilla
September 2026

"I had a water leakage in my HVAC unit and Jay came out and did an amazing job on the repair. It took him longer than expected and he was working later into the night but made sure everything was done properly and efficiently. Super grateful for Jay's hard work and will definitely be reaching out for any future HVAC repairs I need!"

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RN
Robert Nicolay
September 2026

"This is a good company. They helped me out with my new hvac equipment for three systems in the home. The systems where over 20 years old."

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MG
Manny Gutierrez
September 2026

"Jay and his team provide incredible service! They are fast, reliable, professional, and have incredible precision and attention to detail. You can tell they truly care about the quality of their work and making sure everything is done right. Highly recommend Jay and his team to anyone looking for dependable, top-quality service!"

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