Air handler blower runs constantly
If your air handler blower runs constantly, check fan mode, active heat or cooling calls, filter airflow, condensate clues, and stuck-control stop points.
HVAC • RepairRiot
Air Handler Troubleshooting & Repair Guides
Use blower behavior, water leaks, condensate clues, breaker trips, and airflow symptoms to narrow down air-handler problems.
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Featured air handler guides
Air handler blower starts then stops
If your air handler blower starts then stops, check thermostat fan mode, filter airflow, condensate safety, ice, and short-cycle stop points.
Air handler buzzing
If your air handler is buzzing, sort cabinet vibration, filter airflow, condensate clues, blower strain, and electrical stop points before buying parts.
Air handler cabinet sweating
Air handler cabinet sweating? Check filter airflow, return restrictions, seams, drain water, ice, and insulation clues before parts.
Air handler clicking noise
Air handler clicking? Sort thermostat calls, panel chatter, filter airflow, condensate safety, relay clues, and blower stop points before parts.
Air handler condensation on cabinet
If your air handler has condensation on the cabinet, check airflow, filter restriction, cabinet seams, drain backup, ice, and humidity clues first.
More air handler problems
Air handler dripping water
If your air handler is dripping water, check the filter, drain pan, condensate line, float switch, and ice clues before buying parts.
Air handler drips after storm
If your air handler drips after a storm, check condensate drain backup, pan water, float switch, filter airflow, and cabinet moisture clues.
Air handler fan not running
Air handler fan not running? Check thermostat command, filter airflow, breaker clues, condensate safety, and stop points before parts.
Air handler fan rubs
Air handler fan rubs or scrapes? Stop the system, check panel fit, filter restriction, blower rub marks, and service stop points.
Air handler fan runs but no cooling
Air handler fan runs but no cooling? Check thermostat call, filter airflow, drain safety, ice, and outdoor condenser clues before parts.
Air handler fan runs but no heat
Air handler fan runs but no heat? Check thermostat heat call, filter airflow, drain safety, breakers, and outdoor heat-pump clues.
Air handler filter door whistles
Air handler filter door whistles? Check filter size, door fit, gasket gaps, return restriction, and panel fasteners before blower parts.
Air handler frozen coil
Air handler coil frozen? Turn cooling off, thaw fully, check filter airflow, drain water, and know when refrigerant service is needed.
Air handler hum but no fan
Air handler hums but no fan? Check filter restriction, drain safety, blower drag, breaker clues, and stop points before parts.
Air handler ice returns after thaw
Air handler ice returns after thaw? Check filter airflow, returns, drain water, blower clues, and when refrigerant service is needed.
Air handler inside unit wont shut off
Air handler inside unit won't shut off? Check thermostat fan setting, cycle timing, filter airflow, and control stop signs before parts.
Air handler low airflow upstairs
Air handler has low airflow upstairs? Check filter restriction, closed registers, room temperature split, and accessible dampers before parts.
Air handler making noise
Air handler making noise? Separate rattles, buzzing, squealing, scraping, airflow restriction, and panel vibration before parts.
Air handler not blowing air
Air handler not blowing air? Check thermostat fan command, filter restriction, power, pan water, and no-air register clues first.
Air handler not moving enough air
Air handler not moving enough air? Check filter restriction, return grilles, supply registers, duct blockage, and blower stop signs.
Air handler not turning on
Air handler not turning on? Check thermostat command, power, pan water, float switch clues, and no-response stop signs before parts.
Air handler not working
Air handler not working? Sort thermostat command, airflow, pan water, filter restriction, and electrical stop signs before parts.
Air handler overheating
Air handler overheating? Shut down for hot smell or breaker trips, then check filter airflow, returns, and cabinet clues before parts.
