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Status LED Condition
Green Power" LED ON
Green Power" LED
OFF
Red Trip" LED ON
Red Trip" & Yellow
Alert" LEDs Flashing
Yellow Alert" Flash
Code 1*
Yellow Alert" Flash
Code 2*
Yellow Alert" Flash
Code 3*
Yellow Alert" Flash
Code 4*
Yellow Alert" Flash
Code 5*
Yellow Alert" Flash
Code 6*
Yellow Alert" Flash
Code 7*
Yellow Alert" Flash
Code 8*
Yellow Alert" Flash
Code 9*
*Flash code number corresponds to a number of LED flashes, followed by a pause, and then repeated. Reset ALERT flash code
by removing 24VAC power from monitor; last code will display for 1 minute after monitor is powered on.
System Operation Monitor LED Troubleshooting Codes
Status LED Description
Module has power
Module not powering up
System and compressor
check out OK
Thermostat demand signal
Y1 is present, but compres-
sor not running
Simultaneous flashing.
Long Run Time −
Compressor is running
extremely long run cycles
System Pressure Trip −
Discharge or suction pres-
sure out of limits or
compressor overloaded
Short Cycling − Compres-
sor is running only briefly
Locked Rotor
Open Circuit
Open Start Circuit −
Current only in run circuit
Open Run Circuit − Current
only in start circuit
Welded Contactor −
Compressor always runs
Low Voltage − Control
circuit <17VAC
Table 5
Status LED Troubleshooting Information
24VAC control power is present at the module terminal.
Determine/verify that both R and C module terminals are connected
and voltage is present at both terminals.
1.
Verify Y terminal is connected to 24VAC at contactor coil.
2.
Verify voltage at contactor coil falls below 0.5VAC when off.
3.
Verify 24VAC is present across Y and C when thermostat
demand signal is present; if not present, R and C wires are reversed.
1.
Compressor protector is open.
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 the system.
6.
Compressor contactor has failed to close.
Indicates that the control circuit voltage is too low for operation.
1.
Low refrigerant charge.
2.
Evaporator blower is not running.
3.
Evaporator coil is frozen.
4.
Faulty metering device.
5.
Condenser coil is dirty
6.
Liquid line restriction (filter drier blocked if present)
7.
Thermostat is malfunctioning
1.
High head pressure.
2.
Condenser coil poor air circulation (dirty, blocked, dam-
aged).
3.
Condenser fan is not running.
4.
Return air duct has substantial leakage.
5.
If low pressure switch is present, see Flash Code 1 info.
1.
Thermostat demand signal is intermittent.
2.
Time delay relay or control board is defective.
3.
If high pressure switch is present, see Flash Code 2 info.
4.
If low pressure switch is present, see Flash Code 1 info.
1.
Run capacitor has failed.
2.
Low line voltage (contact utility).
3.
Excessive liquid refrigerant in the compressor.
4.
Compressor bearings are seized.
1.
Outdoor unit power disconnect is open.
2.
Unit circuit breaker or fuse(s) is open.
3.
Unit contactor has failed to close.
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.
1.
Run capacitor has failed.
2.
Open circuit in compressor start wiring or connections.
3.
Compressor start winding is damaged.
1.
Open circuit in compressor start wiring or connections.
2.
Compressor start winding is damaged.
1.
Compressor contactor failed to open.
2.
Thermostat demand signal not connected to module.
1.
Control circuit transformer is overloaded.
2.
Low line voltage (contact utility).
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