Ducane products are built to last and lab tested for dependability. Each one is designed to deliver reliable comfort while helping you save money. No matter what the weather or season, Ducane is always the right choice.

Air Conditioner Error Codes

CODE: POWER (Green). 
PROBLEM: Module has power 
FIX: Supply voltage is present at module terminals. 

CODE: TRIP (Red). 
PROBLEM: Thermostat demand signal Y1 is present, but the compressor is not running 
FIX: 1. Compressor protector is open - Check for high head pressure - Check compressor supply voltage 2. Outdoor unit power disconnect is open 3. Compressor circuit breaker or fuse(s) is open 4. Broken wire or connector is not making contact 5. Low pressure switch open if present in system 6. Compressor contactor has failed open. 

CODE: ALERT (Yellow) Flash Code 1. 
PROBLEM: Long Run Time Compressor is running extremely long run cycles 

CODE: ALERT (Yellow) Flash Code 2. 
PROBLEM: System Pressure Trip Discharge or suction pressure out of limits or compressor overloaded 
FIX: 1. High head pressure - Check high pressure switch if present in system - Check if system is overcharged with refrigerant - Check for non-condensable in system 2. Condenser coil poor air circulation (dirty, blocked, damaged) 3. Condenser fan is not running - Check fan capacitor - Check fan wiring and connectors - Check fan motor for failure or blockage 4. Return air duct has substantial leakage 5. If low pressure switch present in system, check Flash Code 1 information. 

CODE: ALERT (Yellow) Flash Code 3. 
PROBLEM: Short Cycling Compressor is running only briefly 
FIX: 1. Thermostat demand signal is intermittent 2. Time delay relay or control board defective 3. If high pressure switch present, go to Flash Code 2 information 4. If low pressure switch present, go to Flash Code 1 information. 

CODE: ALERT (Yellow) Flash Code 4. 
PROBLEM: Locked Rotor 
FIX: 1. Run capacitor has failed 2. Low line voltage (contact utility if voltage at disconnect is low) - Check wiring connections 3. Excessive liquid refrigerant in compressor 4. Compressor bearing are seized 5. Measure compressor oil level. 

CODE: ALERT (Yellow) Flash Code 5. 
PROBLEM: Open Circuit 
FIX: 1. Outdoor unit power disconnect is open 2. Compressor circuit breaker or fuse(s) is open 3. Compressor contactor has failed open - Check compressor contactor wiring and connectors - Check for compressor contactor failure (burned, pitted, or open) - Check wiring and connectors between supply and compressor - Check for low pilot voltage at compressor contactor coil 4. High pressure switch is open and requires manual reset 5. Open circuit in compressor supply wiring or connections 6. Unusually long compressor protector reset time due to extreme ambient temperature 7. Compressor windings are damaged - Check compressor motor winding resistance. 

CODE: ALERT (Yellow) Flash Code 6. 
PROBLEM: Open Start Circuit. Current only in run circuit 
FIX: 1. Run capacitor has failed 2. Open circuit in compressor start wiring or connections - Check wiring and connectors between supply and the compressor S terminal 3. Compressor start winding is damaged - Check compressor motor winding resistance. 

CODE: ALERT (Yellow) Flash Code 7. 
PROBLEM: Open Run Circuit. Current only in start circuit. 
FIX: 1. Open circuit in compressor run wiring or connections - Check wiring and connectors between supply and the compressor R terminal 2. Compressor run winding is damaged - Check compressor motor winding resistance. 

CODE: ALERT (Yellow) Flash Code 8. 
PROBLEM: Welded Contactor. Compressor always runs 
FIX: 1. Compressor contactor has failed closed 2. Thermostat demand signal not connected to module. 

CODE: ALERT (Yellow) Flash Code 9. 
PROBLEM: Low Voltage. Control circuit less than 17VAC 
FIX: 1. Control circuit transformer is overloaded 2. Low line voltage (contact utility if voltage at disconnect is low) - Check wiring conditions.

Furnace Error Codes

CODE: LED off. 
PROBLEM: No power to control or control hardware fault detected. 

CODE: LED on. 
PROBLEM: Normal operation. 

CODE: 1 Flash. 
PROBLEM: Flame present with gas valve off. 

CODE: 2 Flashes. 
PROBLEM: Pressure switch closed with inducer off. 

CODE: 3 Flashes. 
PROBLEM: Low fire pressure, rollout or aux limit switch open. 

CODE: 4 Flashes. 
PROBLEM: High limit switch open. 

CODE: 5 Flashes. 
PROBLEM: Not used. 

CODE: 6 Flashes. 
PROBLEM: Pressure switch cycle lockout. 

CODE: 7 Flashes. 
PROBLEM: Lockout due to no ignition. 

CODE: 8 Flashes. 
PROBLEM: Lockout due to too many flame dropouts.