When Michigan temperatures drop, a heating system issue can quickly turn from an inconvenience into a serious problem. While the highly trained, licensed technicians at Kelley Brothers are always ready to provide reliable heater service and repair, there are several simple troubleshooting steps homeowners can take themselves before picking up the phone. Addressing these common problems first can often restore warmth immediately, saving you a service call and getting your system back on track.
If your furnace, heat pump, or ductless mini-split is acting up, start with this easy checklist.
Quick DIY Checks for a Cold Home
Many heating issues stem from simple oversights or easily corrected component problems. We recommend these steps as the very first line of defense:
Check Your Thermostat: Is it set to “Heat” mode? Is the temperature setting at least a few degrees above the current room temperature? For many systems, the fan should be set to “Auto,” not “On.” Setting the fan to “On” forces it to run constantly, even when the heating cycle is off, which just blows cold air through the vents. If it’s a digital thermostat, replace the batteries, even if the display looks fine.
Check the Power: Head to your electrical panel (breaker box). Has the circuit breaker for your furnace or indoor air handler tripped? If it has, flip the breaker completely off, wait a moment, and then flip it back on. If it trips immediately again, do not attempt to reset it repeatedly—this signals a serious electrical issue that requires professional attention.
Check the Furnace Door: On many furnaces, the access panel (service door) must be completely closed and properly sealed for the safety switch to engage and allow the unit to run. Ensure the door is securely fastened.
Check Your Air Filter: A dirty or clogged air filter is the single most common cause of heating system failure. A clogged filter blocks airflow, causing the furnace to overheat and trip its safety limit switch. This will cause the system to shut down and blow only cold air. Turn the system off, pull the filter, and if it’s thick with dust and grime, replace it immediately. This will often allow the unit to cool down and restart its heating cycle.
When Your Furnace Still Isn’t Working: Deeper Dives
If the initial checks don't fix the issue, the problem might involve specific system components.
Furnace Issues (Gas or Oil)
If you have a traditional furnace, a lack of heat often comes down to the ignition system:
Pilot Light Problems (Older Furnaces): If you have a standing pilot light, check to see if it is lit. If it’s out, you can try to follow the manufacturer’s instructions to carefully relight it. If it won't stay lit, or if you smell gas, turn off the gas supply and call for service immediately.
Ignition or Flame Sensor Problems (Newer Furnaces): Modern furnaces use an electronic ignition or a hot surface igniter. If the furnace is attempting to start but failing to light, the flame sensor may be coated in soot and unable to detect the flame. While you can sometimes gently clean this sensor, issues with the igniter or the gas supply require a certified technician.
Heat Pump Issues
Heat pumps face unique challenges in Michigan's colder climate:
Outdoor Unit Blockage: In snowy or icy conditions, the outdoor unit may become covered in snow or debris. This blocks airflow, preventing the unit from extracting heat from the outside air. Safely clear away all snow and ice from around the unit. Ensure there is at least two feet of clear space around the entire system.
Defrost Cycle: If your heat pump is blowing cool air, it may simply be in its defrost cycle. This is a normal function where the unit temporarily runs in cooling mode to melt ice off the outdoor coils. The defrost cycle usually lasts only a few minutes, but if your unit is iced over, it may struggle. If the heat pump remains iced over or constantly cycles through defrost, professional inspection is necessary.
When to Call the Experts at Kelley Brothers
While DIY troubleshooting can fix minor issues, certain problems require the specialized tools, licensing, and expertise of a professional to prevent serious damage or safety hazards. Kelley Brothers technicians are licensed and insured to handle every major and minor repair across all brands, including furnaces, heat pumps, and ductless mini-splits.
Call us at (734) 251-4625 immediately if you experience any of the following:
No Heat After Troubleshooting: If you’ve checked the thermostat, filter, and power and the system is still cold.
Strange Noises: Loud banging, grinding, squealing, or scraping sounds often indicate a failing blower motor, worn bearings, or a cracked component.
Burning or Electrical Odors: A persistent electrical or chemical smell signals a potentially dangerous issue with wiring or internal parts.
Circuit Breaker Trips Repeatedly: This is a clear warning sign of a serious electrical fault or overheating.
Red or Yellow Flame (Gas Furnaces): Your gas flame should be a crisp blue color. A yellow or red flame indicates poor combustion, which can lead to the production of dangerous carbon monoxide.
Don’t let a malfunctioning heater leave your family in the cold. For all complex furnace service and heater repair needs in Livonia and Southeast Michigan, rely on the professionals at Kelley Brothers for same-day response and reliable results.