Cregger has been repairing furnaces across Metro Detroit since 1993. When your heat goes out in the middle of a Michigan winter, you need fast answers — not guesswork. This guide walks you through the most common furnace problems, what repairs typically cost in the Detroit area, and the questions every homeowner should ask before authorizing any work.
Why Furnace Repairs Are So Common in Michigan
Metro Detroit’s heating season runs from October through April — sometimes longer. That’s six or more months of near-continuous operation, and furnaces that aren’t properly maintained feel every hour of it. Add in Michigan’s hard water effects on humidifier components, wide temperature swings that stress heat exchangers, and homes with older systems that were never designed for today’s efficiency standards, and it’s no surprise that furnace repair calls spike every November and again in January.
The good news: most furnace failures aren’t catastrophic. The majority of repair calls Cregger responds to involve a handful of common components that fail predictably over time. Knowing what to look for — and what it should cost to fix — puts you in a much stronger position as a homeowner.
Most Common Furnace Problems in Metro Detroit
Here are the issues Cregger technicians encounter most often on repair calls throughout Southeast Michigan:
Ignitor Failure
The ignitor lights the burner to start the heating cycle. Hot surface ignitors are the most common type in modern furnaces and typically last 4–7 years before they crack or burn out. Symptoms include the furnace attempting to start but producing no heat, or short cycling where the system turns on and off rapidly without completing a cycle.
Flame Sensor Issues
The flame sensor is a small rod that confirms the burner has ignited before allowing gas to flow. Over time, the sensor collects a thin layer of residue that prevents it from reading the flame accurately. A dirty or failed flame sensor causes the furnace to shut down moments after startup. This is one of the most common furnace repairs Cregger performs — and one of the most straightforward to fix.
Blower Motor Problems
The blower motor circulates heated air through your ductwork. A failing blower motor may run constantly, produce unusual noises, deliver weak airflow, or fail to run at all. Blower motor issues are often preceded by a humming or rattling sound that gets progressively worse over several weeks.
Heat Exchanger Cracks
A cracked heat exchanger is the most serious furnace problem on this list. The heat exchanger separates combustion gases — including carbon monoxide — from the air circulating through your home. A crack allows those gases to enter your living space, creating a safety hazard. Symptoms can include a sulfur or chemical smell, soot around the furnace, or carbon monoxide detector alerts. If a crack is confirmed, the furnace must be shut down immediately. Replacement is almost always required rather than repair.
Pressure Switch and Draft Inducer Failures
Modern high-efficiency furnaces use a draft inducer motor to push combustion gases through a secondary heat exchanger and out the flue. Pressure switches monitor this process and shut the furnace down if airflow is abnormal. Failures in either component prevent the heating cycle from starting. These repairs are more involved than ignitor or flame sensor work but are still well within the range of routine furnace service.
Thermostat and Control Board Issues
Sometimes the furnace itself is fine — the problem is in the thermostat or the furnace’s control board. A faulty thermostat may not signal the furnace to start, or may send incorrect signals that cause erratic behavior. Control board failures are less common but can cause a wide range of symptoms. Cregger technicians carry diagnostic tools to isolate these issues quickly rather than replacing components by trial and error.
What Does Furnace Repair Cost in Metro Detroit?
Repair costs vary based on the component involved, parts availability, and the age of the system. Here are typical ranges for common furnace repairs in the Detroit area:
- Ignitor replacement: $150 – $300
- Flame sensor cleaning or replacement: $80 – $200
- Blower motor replacement: $400 – $800
- Pressure switch replacement: $100 – $250
- Draft inducer motor replacement: $300 – $600
- Control board replacement: $400 – $700
- Heat exchanger replacement: $1,000 – $2,500+ (replacement often recommended instead)
These are estimates. Final pricing depends on the specific furnace make and model, parts availability, and the complexity of the repair. Cregger provides upfront pricing before any work begins — you’ll know the cost before you commit.
Repair vs. Replace: How to Think About the Decision
Cregger uses a straightforward rule of thumb: multiply your furnace’s age in years by the estimated repair cost. If that number exceeds $5,000 — or comes close to the cost of a new system — replacement is usually the more sensible financial decision. A 15-year-old furnace with a $600 blower motor repair is almost always worth fixing. A 20-year-old furnace with a $1,500 control board failure is worth a harder look.
Efficiency also matters. An older furnace running at 70–80% AFUE is costing you meaningfully more in gas bills every month compared to a modern 96% AFUE unit. Over a Michigan heating season, that gap adds up.
What to Ask Your Furnace Technician Before Authorizing Repairs
These are the questions Cregger believes every homeowner should ask — and that any reputable technician should be able to answer clearly:
- What exactly failed, and can you show me? A good tech can point to the failed component and explain what it does.
- Is this a safety issue, or a comfort and efficiency issue? Understanding severity helps you prioritize.
- What’s the total cost including parts and labor, before you start? Upfront pricing is non-negotiable.
- Is this repair likely to solve the problem, or are there other components showing signs of wear? You want to avoid paying for one repair today and another in three weeks.
- Given the age of my system, does this repair make financial sense? An honest technician will tell you if they think replacement is the better path.
- Is there a warranty on the repair? Ask about both parts and labor warranties.
Cregger technicians are trained to walk homeowners through each of these points on every repair call. Our job isn’t just to fix the furnace — it’s to make sure you understand what happened and feel confident in the decision you’re making.
How to Reduce the Risk of Furnace Breakdowns
Annual furnace maintenance is the single most effective way to avoid unexpected repair calls. Cregger’s fall tune-up includes inspecting and cleaning the burners, heat exchanger, and blower, testing ignition and safety controls, checking the flue and combustion air supply, and replacing the filter if needed. Scheduling this in September or October — before the heating season — means your system goes into winter in its best possible condition.
Homeowners can also help by replacing the air filter every one to three months during heating season, keeping return air vents unobstructed, and making sure the area around the furnace is clear of stored items that can restrict airflow.
Frequently Asked Questions About Furnace Repair in Metro Detroit
How long does a furnace repair usually take? Most standard repairs are completed in one to three hours. Parts availability is the most common reason for a second visit.
Does Cregger offer emergency furnace repair? Yes. Cregger provides emergency heating service for Metro Detroit homeowners. If your heat goes out overnight or on a weekend, call us.
What brands does Cregger repair? Cregger technicians are trained to service all major furnace brands, including Carrier, Lennox, Trane, Rheem, Bryant, and others.
Call Cregger in Metro Detroit today for fast, honest furnace repair. We serve Ferndale, Royal Oak, Birmingham, Troy, and communities across Southeast Michigan — with upfront pricing, experienced technicians, and same-day service options when you need heat fast.
