GSZH5 Service Manual

77
SERVICING
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Status Description
Troubleshooting Information
Yellow "ALERT"
Flash Code 4
Locked Rotor
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 bearings are seized
• Measure compressor oil level
Yellow "ALERT"
Flash Code 5
Compressor (Moderate Run) Trip
1. Evaporator blower is not running
• Check blower relay coil and contacts
• Check blower motor capacitor
• Check blower motor for failure or blockage
• Check evaporator blower wiring and connectors
• Check indoor blower control board
• Check thermostat wiring for open circuit
2. Faulty metering device
• Check TXV bulb installation (size, location and contact)
• Check if TXV/fixed orifice is stuck closed or defective
3. Condenser coil poor air circulation (dirty, blocked, damaged)
4. Low refrigerant charge
Red "LOCK"
Flash Code 2
Yellow Off
Compressor (Pressure) Trip;
Compressor is locked out after 4
consecutive or 10 total compressor
(pressure) trip events
1. Condenser fan is not running
• Check fan capacitor
• Check fan wiring and connectors
• Check fan motor for failure or blockage
2. High head pressure
• Check high pressure switch if present in system
• Check if system is overcharged with refrigerant
• Check for non-condensable in system
3. Condenser coil poor air circulation (dirty, blocked, damaged)
Red "LOCK"
Flash Code 3
Yellow Off
Short Cycling; Compressor is locked
out after 10 consecutive short cycling
events
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
Red "LOCK"
Flash Code 4
Yellow Off
Locked Rotor; Compressor is locked
out after 10 consecutive locked rotor
events
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 bearings are seized
• Measure compressor oil level
Red "LOCK"
Flash Code 5
Yellow Off
Compressor (Moderate Run) Trip;
Compressor is locked out after 4
consecutive or 10 total compressor
(moderate run) trip events
1. Evaporator blower is not running
• Check blower relay coil and contacts
• Check blower motor capacitor
• Check blower motor for failure or blockage
• Check evaporator blower wiring and connectors
• Check indoor blower control board
• Check thermostat wiring for open circuit
2. Faulty metering device
• Check TXV bulb installation (size, location and contact)
• Check if TXV/fixed orifice is stuck closed or defective
3. Condenser coil poor air circulation (dirty, blocked, damaged)
4. Low refrigerant charge
"LOCK" Flash Codes