Emerson operation manual Comfort Alert Descriptions Cause E2 Advisory

log.

Comfort Alert	Descriptions	Cause	E2 Advisory
Long Run Time	Compressor is running	Low refrigerant charge.	Compressor run time is long
	extremely long run cycles (typi-	Evaporator blower is not running.
	cally more than 18 hours).	Evaporator coil is frozen.
		Faulty metering device
		Condenser coil is dirty
		Thermostat is malfunctioning
		Compressor Second Stage Cooling Wiring
System Pressure	Discharge or pressure out of	High head pressure.	System pressure trip
Trip	limits or compressor over-	Condenser coil poor air circulation (dirty, blocked,
	loaded.	damaged)
		Condenser fan is not running
		Return air duct has substantial leakage.
Short Cycling	Compressor is running only	Thermostat demand signal is intermittent.	Compressor short cycling
	briefly.	Time delay relay or control board is defective.
		If high pressure switch present, check if there is a
		System Pressure Trip problem.
Locked Rotor	Locked rotor.	Run capacitor has failed.	Locked Rotor Trip
		Low line voltage (contact utility if voltage at dis-
		connect is low).
		Excessive liquid refrigerant in compressor.
		Compressor bearings have seized.
Open Circuit	Compressor open circuit.	Outdoor unit power disconnect is open.	Compressor open circuit
		Compressor circuit breaker or fuse(s) is open.
		Compressor contactor has failed open.
		High pressure switch is open and requires manual
		reset.
		Open circuit in compressor supply wiring or con-
		nections.
		Unusually long compressor protector reset time
		due to extreme ambient temperature.
		Compressor windings are damaged.
Open Start Circuit	Compressor current only in run	Run capacitor has failed	Compressor open start circuit
	circuit.	Open circuit in compressor start wiring or connec-
		tions.
		Compressor start winding is damaged.
Open Run Circuit	Compressor current only in start	Open circuit in compressor run wiring or connec-	Compressor open run circuit
	circuit.	tions.
		Compressor run winding is damaged.
Table 6-6-Comfort Alert Outputs

6-10 • E2 RX/BX/CX I&O Manual 026-1614 Rev 4 5-JAN-2013