Diagnostics - HEIL H4A6 Installation Instructions Manual

INSTALLATION INSTRUCTIONS
Figure 12
Status LED Status LED Description
Green "POWER" Module has power
Red "TRIP" Thermostat demand signal
Y is present, but the
compressor is not running
Yellow "ALERT" Long Run Time
Flash Code 1 Compressor is running
extremely long run cycles
(18 hours or more)
Yellow "ALERT" Internal Protector Trip
Flash Code 2
Yellow "ALERT" Short Cycling
Flash Code 3 Compressor is running only
briefly (1-3 minutes)
Yellow "ALERT" Locked Rotor
Flash Code 4
421 01 6001 00
R-410A, Two-Stage Split System Air Conditioner
Comfort Alertt UltraTecht Diagnostics
Status LED Troubleshooting Information
Supply voltage is present at module terminals
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. Compressor contactor has failed open
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 Alertt failure
8. Thermostat is malfunctioning
•
Check thermostat sub-base or wiring for short circuit
•
Check thermostat installation (location, level)
1. The internal motor protector has opened
• Wait for compressor to cool down, protector will close
automatically
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
1. 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
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