Air handler blower runs constantly
Find out why an air handler blower keeps running by checking fan settings, thermostat calls, filter airflow, and condensate controls before assuming a motor problem.
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 and then stops, check thermostat settings, filter restriction, drain safety shutdown, and icing before assuming the motor failed.
Air handler buzzing
Find out why an air handler is buzzing by separating harmless vibration from electrical or blower trouble. Start with filter, panel, airflow, and condensate checks, then know when to stop and call for service.
Air handler cabinet sweating
Find out why an air handler cabinet is sweating, from airflow and insulation issues to a clogged condensate drain, and know when to stop and call for HVAC service.
Air handler clicking noise
Track down an air handler clicking noise by separating relay clicks, airflow chatter, drain safety issues, and blower problems before replacing anything.
Air handler condensation on cabinet
Find out why your air handler cabinet is sweating or dripping. Start with airflow and drain checks, separate normal surface sweating from icing, and know when to stop and call for HVAC service.
More air handler problems
Air handler dripping water
Find out why your air handler is dripping water. Start with the drain pan, condensate line, filter, and icing clues before you call for service or replace parts.
Air handler drips after storm
Find out why an air handler starts dripping after a storm. Check for condensate drain clogs, float switch trips, cabinet sweating, and storm-related airflow problems before replacing parts.
Air handler fan not running
If your air handler fan is not running, start with thermostat, filter, drain safety switch, and power checks before blaming the blower motor. Here’s the safest way to narrow it down.
Air handler fan rubs
Find out why an air handler fan is rubbing, scraping, or dragging. Start with safe airflow and panel checks, then narrow down wheel, housing, and blower issues before calling for service.
Air handler fan runs but no cooling
If your air handler fan runs but the house is not cooling, start with thermostat, filter, airflow, drain safety switch, and outdoor unit checks before assuming a major failure.
Air handler fan runs but no heat
If your air handler fan runs but no heat comes out, start with thermostat, breaker, filter, and airflow checks. Then separate heat-strip, float-switch, and outdoor-unit problems before buying parts.
Air handler filter door whistles
A whistling air handler filter door usually points to air leaking past the panel, a clogged filter, or too much return-air restriction. Check the filter fit, door seal, and panel latch before chasing motor problems.
Air handler frozen coil
A frozen air handler coil usually points to low airflow, a dirty filter, a wet coil, or a refrigerant problem. Start by thawing it safely, then check airflow and drainage before calling for service.
Air handler hum but no fan
If your air handler hums but the fan will not start, check thermostat call, filter restriction, drain safety switch, and blower wheel drag before assuming a motor failure.
Air handler ice returns after thaw
If your air handler freezes again after thawing, start with airflow and drain checks. Repeated ice usually points to restricted airflow or a refrigerant problem that needs service.
Air handler inside unit wont shut off
If your air handler inside unit won't shut off, start with thermostat fan settings, filter and airflow checks, and condensate safety issues before assuming a bad motor or board.
Air handler low airflow upstairs
Low airflow upstairs usually comes from a dirty filter, closed or blocked registers, a weak blower, or duct restrictions. Start with the easy checks before chasing parts.
Air handler making noise
Find out why your air handler is making noise by separating rattles, buzzing, squealing, and airflow sounds. Start with safe checks, then know when to stop and call for service.
Air handler not blowing air
If your air handler is not blowing air, start with thermostat, filter, power, and condensate checks before assuming a bad blower. Here’s the safest way to narrow it down.
Air handler not moving enough air
Low airflow from an air handler is usually a clogged filter, blocked return or supply, dirty indoor coil, or a blower problem. Start with safe checks before calling for service.
Air handler not turning on
If your air handler is not turning on, start with thermostat, power, filter, and condensate checks before assuming a bad motor or control problem.
Air handler not working
Troubleshoot an air handler that is not working by checking thermostat settings, filter blockage, power, and condensate safety shutdown before calling for service.
Air handler overheating
If your air handler is overheating, start with airflow, filter, and drain checks before assuming a motor failure. Learn the safe next steps and when to stop DIY.
