AC & Heat Pump

AC Troubleshooting Guide
Troubleshooting Chart
Pressure Temp. Chart
Component Analysis

Furnaces, Boilers & Radiators

Pilot Reignition Furnace
Standing Pilot Furnace
Hot Surface Ignition Furnace

Air Quality Components

Basic Troubleshooting

Thermostats & Controls

Basic Troubleshooting
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  HVAC Technical Support - Hot Surface Ignition Furnace Troubleshooting

Induced Draft Motor Will Not Run
  Fault Codes
  Induced Draft Motor Will Not Run

Hot Surface Igniter Will Not Glow
  Open Pressure Switch
  Limit Or Flame Rollout Switch Is Open
  Hot Surface Ignitor Failure

Burners Will Not Ignite
  No. 115-volt Power to the Furnace
  No 24-Volt Power To Control Circuit
  Miswired, Loose Connections Or Open Control Circuit
  No Gas At Main Burners

Burners Will Not Remain Lit
  Flame Sensor
  Low Gas Pressure
  Rough Ignition
  Reversed Polarity
  Open Pressure Switch
  Limit Or Flame Rollout Switch Is Opening
  Thermostat Calls For Heat

Blower Operates Continuously
  Thermostat Fan Switch In ON Position
  Fusible Link Blown
  Dirty Filter Causing Limit Switch Operation
  Defective Heat Relay

Inadequate Heating
  Furnace Undersized For Application
  Gas Input To Furnace Too Low
  Limit Switch Cycles Main Burners

  Aldehyde Odors (CO), Sooting Flame, Floating Flame
 Thermostat Calls For Heat