Home Symptom Decoder: Why Is My…?
Updated August 2026
Something is making a noise, leaking, or cycling on and off, and you want to know what it is before you pay someone. Each guide below leads with the single most likely cause, ranks the rest by how common they are, gives the fix and a real dollar range for each, and flags the safety checks to make first. Start with the symptom that matches yours.
Electrical
- Why does my breaker keep tripping?
- Why does my GFCI outlet keep tripping?
- Why does my breaker trip right after I reset it?
- Why is my carbon monoxide detector beeping?
- Why does my smoke detector keep chirping?
- Why won't my breaker reset?
- Why did my ceiling fan stop but the light works?
- Why does my ceiling fan wobble?
- Why is my electrical panel buzzing?
- Why is my breaker or panel warm?
- Why won't my EV charger charge my car?
- Why won't my GFCI outlet reset?
- Why did the outlets in one room stop working?
- Why does my smoke alarm go off randomly?
- Why won't my standby generator start?
Heating and cooling
- Why is my furnace short cycling?
- Why is my central AC blowing warm air?
- Why is my AC outdoor fan not spinning?
- Why is my AC freezing up?
- Why is my AC leaking water inside?
- Why does my AC keep short cycling?
- Why is my furnace blowing cold air?
- Why does my furnace light then shut off?
- Why is my heat pump blowing cold air?
- Why is my heat pump icing up in winter?
- Why is my mini-split not cooling?
- Why is my mini-split leaking water from the indoor unit?
- Why is my thermostat screen blank?
- Why does my AC drain line keep clogging?
- Why does my AC smell musty when it runs?
- Why does my AC keep tripping the breaker?
- Why does my furnace pilot light keep going out?
- Why is my heat pump's aux heat always on?
- Why does my heat pump run constantly in cold weather?
- Why does my mini-split smell musty?
- Why is my air handler leaking water?
- Why do some rooms get no airflow?
- Why is my furnace blower humming but not spinning?
- Why is my boiler banging (kettling)?
- Why does my boiler keep losing pressure?
- Why isn't my condensate pump working?
- Why is my AC condenser humming but not starting?
- Why isn't my dehumidifier collecting water?
- Why do my air ducts bang or pop?
- Why does my furnace bang when it starts?
- Why won't my furnace fan turn off?
- Why won't my furnace igniter glow?
- Why does my furnace keep tripping the breaker?
- Why is my high-efficiency furnace leaking water?
- Why does my furnace smell like burning?
- Why is my heat pump short cycling?
- Why is my mini-split flashing an error light?
- Why is my radiator cold at the top?
- Why does my thermostat click but nothing happens?
- Why won't my house reach the thermostat setting?
- Why does my AC capacitor keep failing?
Kitchen-appliances
- Why is my dishwasher leaking from the bottom?
- Why isn't my dishwasher cleaning well?
- Why won't my dishwasher drain?
- Why is my refrigerator leaking water?
- Why is my fridge warm but the freezer is cold?
- Why won't my gas stove burner light?
- Why isn't my ice maker making ice?
- Why isn't my oven heating?
- Why is my refrigerator freezing food?
- Why aren't my dishes drying?
- Why does my dishwasher smell?
- Why won't my electric stove burner heat?
- Why isn't my freezer freezing?
- Why does my gas oven click but not light?
- Why does my gas stove keep clicking?
- Why won't my induction cooktop detect my pan?
- Why does my microwave run but not heat?
- Why is my microwave sparking inside?
- Why won't my oven hold the right temperature?
- Why isn't my range hood pulling smoke?
- Why is frost building up in my freezer?
- Why is my refrigerator so loud?
- Why does my refrigerator run all the time?
- Why isn't my fridge water dispenser working?
Laundry
- Why is my dryer not heating?
- Why does my dryer take two cycles to dry?
- Why won't my washing machine drain?
- Why won't my washer spin?
- Why does my dryer shut off mid-cycle?
- Why does my dryer smell like burning?
- Why is my washing machine leaking?
- Why does my washing machine shake and walk?
- Why does my front-load washer smell moldy?
- Why is my dryer squealing?
- Why is no air coming out my dryer vent outside?
- Why won't my washing machine fill with water?
Outdoor-lawn
Plumbing and water heating
- Why does my faucet drip when it's off?
- Why is my garbage disposal completely dead?
- Why is my garbage disposal humming but not spinning?
- Why won't my sump pump turn on?
- Why does my sump pump run constantly?
- Why does my toilet keep running?
- Why is my toilet leaking at the base?
- Why won't my toilet flush completely?
- Why is my water heater leaking from the bottom?
- Why is my water heater popping or rumbling?
- Why does my hot water run out so fast?
- Why does my hot water smell like rotten eggs?
- Why does one faucet have low pressure?
- Why are all my drains slow at once?
- Why is my tankless water heater showing an error code?
- Why does my toilet fill up then drain slowly?
- Why won't my water heater pilot stay lit?
- Why is my water softener not using salt?
- Why does my well pump keep cycling on and off?
- Why do my drains smell like sewage?
- Why is my garbage disposal leaking?
- Why does my garbage disposal smell?
- Why is my heat pump water heater leaking water?
- Why isn't my heat pump water heater making hot water?
- Why is my outdoor faucet leaking?
- Why won't my main water shutoff valve turn?
- Why is my sink P-trap leaking?
- Why do my pipes bang when the water shuts off?
- Why is my well pressure tank waterlogged?
- Why is my septic system draining slowly?
- Why is sewage backing up into my basement?
- Why won't my shower get hot?
- Why does my shower go hot and cold?
- Why does my showerhead have low pressure?
- Why does my sump pump turn on and off rapidly?
- Why is my sump pump so loud?
- Why can't my tankless water heater keep up?
- Why does my toilet gurgle?
- Why does my toilet flush by itself?
- Why does my electric water heater trip the breaker?
- Why is my house water pressure too high?
- Why is my water still hard with a softener?
- Why is my well water pressure dropping?
- Why is my well pump running but no water?
Roofing-exterior
- Why won't my garage door close?
- Why won't my garage door open?
- Why does my basement leak when it rains?
- Why does my garage door go back up before closing?
- Why do my gutters overflow when it rains?
- Why does my roof only leak in heavy rain?
- Why is my attic wet or frosty in winter?
- Why is my attic so hot in summer?
- Why is there a water stain on my ceiling?
- Why is my chimney leaking?
- Why does smoke come into the room from my fireplace?
- Why is my foundation cracking?
- Why is my garage door so loud?
- Why does my garage opener run but the door won't move?
- Why are my gutters sagging or pulling away?
- Why does my roof keep forming ice dams?
- Why does my roof have black streaks?
- Why are my roof shingles curling?
- Why are my shingles losing granules?
- Why are my windows so drafty?
- Why are my windows foggy between the panes?
Every symptom on this page traces back to a habit someone skipped. OnOtto keeps the boring prevention on schedule, so the noise, the leak, and the 2 a.m. failure never get their chance.
Stay ahead of it, free for 30 days