HVAC Air Flow Problems

Common Air Distribution Problems and Solutions

  1. Heating or central air conditioning does not work at all
  2. System runs but no hot or cold air flow
  3. Heating or cooling insufficient in part of the house
  4. Heating or cooling insufficient throughout entire house
  5. Air flow noisy
  6. Blower noise excessive
  7. Blower belt slips or squeals

Heating or central air conditioning does not work at all

Possible CauseProcedure
No power to unitReset circuit breaker or replace fuse

System runs but no hot or cold air flow

Possible CauseProcedure
Blower belt broken or looseInspect and adjust belt tension
Fan-and limit control faultyTest fan-and-limit control
Blower relay faultyTest blower relay
Blower motor faultyInspect blower motor

Heating or cooling insufficient in part of the house

Possible CauseProcedure
Register closed or blocked, or filter dirtyOpen register and remove obstructions
Replace filter
Blower blades dirtyClean blower blades
Duct disconnected or damper closedReconnect duct or open damper

Heating or cooling insufficient throughout entire house

Possible CauseProcedure
Air filter dirtyReplace filter
Blower running poorlyOil blower motor and bearings
Blower bearings dry or wornLubricate bearings
Call for service
Duct damper adjusted improperlyAdjust dampers

Air flow noisy

Possible CauseProcedure
Blower speed too highAdjust blower speed
Call for service
Joints loose at duct cornersTighten joints and adjust duct hangers
Call for service

Blower noise excessive

Possible CauseProcedure
Blower motor bearings dry or wornLubricate bearings
Call for service
Motor or blower mounting hardware looseTighten mounting hardware

Blower belt slips or squeals

Possible CauseProcedure
Belt tension incorrectAdjust belt tension
Pulley misalignedAlign blower pulleys

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