SERVICING
40
Status LED Status LED Description Status LED Troubleshooting Information
Green “POWER” Module has power Supply voltage is prese nt at module terminals
Red “TRIP” Thermostat demand signal 1. Compressor protector is op en
Y1 is present, but the 2. Outdoor unit power dis connect is open
compressor is not 3. Compressor circuit breake r or fuse(s) is open
running 4. Broken wire or connector is not ma king contact
5. Low pressure switch open if present in system
6. Compressor contactor has f ailed open
Yellow “ALERT” Long Run Time 1. Low refrigerant charge
Flash Code 1 Compressor is 2. Evaporat or blower is not running
running extremely 3. Evapor a tor coil is frozen
long run cycles 4. Faulty metering device
5. Condenser coil is dirty
6. Liquid line restriction (filt er drier blocked if pres ent in system)
7. Thermostat is malfunc ti oni ng
Yellow “ALERT” System Pressure Trip 1. High head pr essure
Flash Code 2 Discharge or suct io n 2. Condenser coil poor air circulation (dir ty, blocked, damaged)
pressure out of limits or 3. Condenser fan is not ru nning
compressor overloaded 4. Return air duct has substantial leak age
5. If low pressure switch present in system,
check Flash Code 1 information
Yellow “ALERT” Short Cycling 1. Thermostat d em and signal is intermittent
Flash Code 3 Compressor is running 2. Time delay relay or control board def ective
only briefly 3. If high pressure switch present go to Flash Code 2 information
4. If low pressure switch p resent go to Flash Code 1 inf ormation
Yellow “ALERT” Locked Rotor 1. Run capacitor has failed
Flash Code 4 2. Low line voltage (contact utility if voltage at disconnect is low)
3. Excessive liquid refrigerant in compressor
4. Compressor bearings are seized
Yellow “ALERT” Open Circuit 1. O utdoor unit power disconnec t is open
Flash Code 5 2. Co mpressor circuit breake r or fuse(s) is open
3. Compressor contactor has f ailed open
4. High pressure switch is open and requir es manual reset
5. Open circuit in compressor s upply wiring or connections
6. Unusually long compresso r protector reset time
due to extreme ambient temperature
7. Compressor windings are dam aged
Yellow “ALERT” Open Start Circuit 1. Run capacitor has failed
Flash Code 6 Current only in run circuit 2. Open circuit in compressor start wiring or connections
3. Compressor start winding is damaged
Yellow “ALERT” Open Run Circuit 1. Open circuit in compressor run wiring or connections
Flash Code 7 Current only in sta rt circuit 2. Compressor run winding is damaged
Yellow “ALERT” Welded Contactor 1. Compres sor contactor has failed close d
Flash Code 8 Compressor always runs 2. Thermostat demand signal not connected to module
Yellow “ALERT” Low Voltage 1. Control circuit transformer is overloaded
Flash Code 9 Control circuit < 17V AC 2. Low line voltage ( c o ntact utility if voltage at disconnect is low)
• Flash Code number corresponds to a number of LED flashes, followed by a pause and then repeated
• TRIP and ALERT LEDs flashing at same time means control circuit voltage is too low for operation.
• Reset ALERT Flash code by removing 24VAC power from module
• Last ALERT Flash code is displayed for 1 minute after module is powered on.
DIAGNOSTICS TABLE