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
Programming Tips
Advanced Programming

Additional Information

Material Safety Data Sheets
Web Links
Equipment Size Calculator
Equipment Tech Guides


Home Owners Section

No Cooling or Insufficient Cooling

Compressor Will Not Run

Compressor runs but Cycles on Internal Overload

Compressor Runs but Insufficient Cooling

Contactor Open Contactor Closed Outdoor Fan Stopped or Cycling on Overload Loose Lead st Fan Motor Low Suction Pressure High Suction Low Head Pressure High Suction Low Superheat
Power Supply Compressor Power Supply Open Outdoor Air Restrained or Recirculating Motor Defective Dirty Air Filters Defective Compressor Valves Unit Overcharged
Defective Low Voltage Transformer Loose Leads at Compressor Restricted Discharge Tube Incorrect CFM Capacitor Duct Restricted Internal Pressure Relief Open Incorrect Size Piston
Open Thermostat Faulty Start Gear (1-Ph) Over Charge or Non-Condensables in system Dampers Partially Closed
Open Control Circuit Open Shortened or Grounded Compressor Motor Windings Low Refrigerant Charge Indoor Coil Frosted
Loss of Charge Compressor Stuck Line Voltage too High or Too Low Slightly Low on Refrigerant
Contactor or Coil Defective Defective Run Capacitor Defective Run Capacitor Liquid Line Slightly Restricted
Loose Electrical Connection Compressor Bearings Piston Restricted
High Superheat Incorrect Size Piston
Indoor Coil Strainer Restricted
Indoor Blower Motor Defective or Cycling on OL