Their furnace was short cycling and the house wouldn’t hold a steady temperature, so the homeowner called worried about comfort and safety as the wet season settles in. Short, frequent heating runs and inconsistent warmth are a clear sign something was wrong inside the system.
Short cycling led us to a cracked heat exchanger
When we inspected the 14-year-old gas furnace in Marysville, the short cycling was the symptom of a much bigger issue. A visual and diagnostic check revealed a crack in the heat exchanger, which explained why the burner kept shutting down prematurely and why the home could not stay at the set temperature.
A cracked heat exchanger matters because it affects both performance and safety. Besides reducing the unit’s ability to heat consistently, it can allow combustion gases to mix with the air circulated through the house, which is a serious safety concern for homeowners across Snohomish and King County.
How we diagnosed and temporarily secured the 14-year-old gas furnace
Our Altitude Heating and Cooling technician performed a careful inspection and ran the necessary combustion and safety tests to confirm the crack. We documented the findings and explained how the age of the unit factored into the options available, since older heat exchangers are more likely to develop stress fractures over time.
Because of the safety implications, we put temporary safety measures in place to protect the household. That included taking the furnace out of service so it would not run in an unsafe condition and verifying that the home’s indoor air quality and carbon monoxide indicators were not showing immediate danger. We scheduled a follow-up appointment for a full assessment so the homeowner could consider repair versus replacement with clear information.
Expect a professional assessment to walk you through realistic options and what each choice means for reliability and safety. If repair is feasible, a licensed technician can replace the failed components and re-test systems; if replacement is the safer long-term path, we’ll outline the right-sized, reliable options and the steps for a smooth swap-out.
What comes next and how this affects your winter plans
For now the home is safe and the furnace will remain offline until a full plan is in place. The homeowner has time to decide between repairing the cracked heat exchanger or replacing the aging unit, and we’ll be back to perform the full assessment and next steps.
If you’re in Marysville or anywhere in Snohomish and King County and notice short cycling or loss of temperature control, call Altitude Heating and Cooling at (425) 201-1998 or visit altitudeheating.com to schedule an inspection. We’ll make sure your home stays safe and warm through the winter.
