Furnace Short Cycling: Time the Cycle, Then Find the Cause
A furnace that turns on and off too often tells you what's wrong by how long it runs. How to time a cycle, what it means, and when to call 612-429-3465.
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In newer Lakeville homes a debris-packed condensate trap is often why the furnace quit, and repair costs a $79 trip charge waived once you approve it. You get the written price before any work.
Lakeville furnace calls come in two waves. The 1970s and 1980s homes near downtown and around Lake Marion and Orchard Lake are on their second or third furnace, often a 1990s or 2000s unit with worn inducer bearings, cracked igniters and tired blower motors. The post-1990 subdivisions, and the new construction still going up, have 90%-plus furnaces venting through PVC, an air exchanger and long duct runs.
In the newer homes, many no-heat calls are drainage: a condensate trap packed with construction debris, a drain line that wasn't pitched right, or a condensate pump that failed and tripped the safety switch. Bonus rooms over garages run cold because the duct run is long and passes through a cold space, and a furnace repair alone won't change that. On newer equipment we check the registration and warranty status first, because a covered part can change what you pay.
Updated October 27, 2026
National averages (HomeGuide, 2026), not our prices: a PSC blower motor $500–$1,400, a variable-speed (ECM) blower motor $800–$2,300, an igniter $100–$250. More in the furnace repair cost guide.
Symptom guides: Red tag · Carbon monoxide · Blowing cold air · Won't ignite · Signs your furnace needs a technician
It depends on the warranty paperwork. Many manufacturers give the longer parts warranty only when the equipment was registered online within 60 days of installation, so check registration with the model and serial numbers from the label. A covered part leaves you paying labor only. Builders' own workmanship warranties are usually short, so read yours. We'll tell you what the part costs either way before we start.
A 90%-plus furnace makes water all winter, and it has to reach a drain. The common causes are a trap clogged with debris, a drain line without enough slope, a cracked fitting or a failed condensate pump. A whole-house humidifier on the furnace can also leak. Put a towel down, check whether the pump runs when you lift its float, and call us. Left alone, a flooded trap shuts the furnace off.
A furnace that turns on and off too often tells you what's wrong by how long it runs. How to time a cycle, what it means, and when to call 612-429-3465.
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