Heil air conditioners troubleshooting

The company Heil Heating and Cooling Products has a rich 100-year history of superior engineering and quality manufacturing. Each unit of the company’s products is tested. All products are designed to provide the maximum quality, efficiency and reliability in operation. However, despite this, Heil equipment can also break down. Therefore, refer to the troubleshooting table below.

Status LEDStatus LED DescriptionStatus LED Troubleshooting Information
Green “POWER”Module has powerSupply voltage is present at module terminals
Red “TRIP”Thermostat demand signal Y is present, but the compressor is not running1. 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. Compressor contactor has failed open
Yellow “ALERT”. Flash Code 1Long Run Time. Compressor is running extremely long run cycles (18 hours or more)1. Low refrigerant charge
2. Evaporator blower is not running
• Check blower relay coil and contacts
• Check blower motor for failure or blockage
• Check evaporator blower wiring and connectors
• Check indoor blower control board
• Check thermostat wiring for open circuit
3. Evaporator coil is frozen
• Check for low suction pressure
• Check for excessively low thermostat setting
• Check evaporator airflow (coil blockages or return air filter)
• Check ductwork or registers for blockage
4. Faulty metering device
• Check TXV bulb installation (size, location, and contact)
• Check if TXV is stuck closed or defective
5. Condenser coil is dirty
6. Liquid line restriction (filter drier blocked)
7. Compressor high-stage cooling wiring
• Solenoid plug not connected / malfunction
• Comfort Alert ^ failure
8. Thermostat is malfunctioning
• Check thermostat sub-base or wiring for short circuit
• Check thermostat installation (location, level)
Yellow “ALERT” . Flash Code 2Internal Protector Trip1. The internal motor protector has opened
• Wait for compressor to cool down, protector will close automatically
Yellow “ALERT”. Flash Code 3Short Cycling. Compressor is running only briefly (1 -3 minutes)1. Thermostat demand signal is intermittent
2. High head pressure
• Check high pressure switch
• Check if system is overcharged with refrigerant
• Check for non-condensable in system
3. Condenser coil poor air circulation (dirty, blocked, damaged)
4. Condenser fan is not running
• Check fan capacitor
• Check fan wiring and connectors
• Check fan motor for failure or blockage
5. Return air duct has substantial leakage
6. Low pressure switch open, see Flash Code 1 information
Yellow “ALERT” . Flash Code 4Locked Rotor1. Run capacitor has failed
2. Low line voltage (contact utility if voltage at disconnect is low, below 187v)
• Check wiring connections
3. Excessive liquid refrigerant in compressor
4. Compressor bearings are seized
Yellow “ALERT”. Flash Code 5Open High Voltage Circuit1. 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 connections
• Check for compressor contactor failure (burned, pitted, open)
• Check wiring and connectors between supply and compressor
• Check for low pilot voltage at compressor contactor coil
4. Open circuit in compressor supply wiring or connections
5. Unusually long compressor protector reset time due to extreme ambient temperature
6. Compressor windings are damaged
• Check compressor motor winding resistance
Yellow “ALERT”. Flash Code 6Open Start Circuit. Current only in run circuit1. 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
Yellow “ALERT”. Flash Code 7Open Run Circuit. Current only in start circuit1. 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
Yellow “ALERT”. Flash Code 8Welded Contactor. Compressor always runs continuous operation1. Compressor contactor has failed closed
2. Thermostat demand signal not connected to module
Yellow “ALERT”. Flash Code 9Low Voltage. Control circuit < 17 VAC1. Control circuit transformer is overloaded
2. Low line voltage (contact utility if voltage at disconnect is low) • Check wiring connections

Back to Top