Emerson operation manual Comfort Alert Codes, Comfort Alert Descriptions Cause E2 Advisory

Diagnostic Alarm	Descriptions	E2 Advisory
Cool Eight Hours	If cool runs for over 8 hours continuously, the thermostat sets anticipator to	Cooling Problem Detected
	zero until call for cool is satisfied.
Fan Not Detected	If the fan is activated and if the Fan Detect input is enabled, the thermostat	Proof Fail
	checks its status 15 seconds after the fan is energized, and if the fan is not
	on, it disables any active heat or cool calls, and report an alarm.
Frost Protection Activated	The thermostat allows a frost protection menu option. When enabled, frost	Frost Protection
	protection is enabled in all system modes including OFF, when temperature
	drops below 42°F (5.5 °C).All other heat / cool calls are disabled, and
	indoor heat is activated until the temperature rises above the frost protec-
	tion threshold.
Table 6-5-Diagnostic Alarm Outputs

Comfort Alert Codes

The thermostat supports the Emerson Climate Tech- nologies Comfort Alert system. On any alert present on Comfort Alert terminal, the thermostat keeps the informa- tion on the fault available over the network so that the E2 can access this information. On some specific alerts, it will

discontinue compressor operation if active protection is enabled.

The Comfort Alert codes are sent separately from the diag- nostic codes. Just like the diagnostic codes, the Comfort Alert codes are entered as advisories in the E2 advisory log.

Comfort Alert	Descriptions		Cause	E2 Advisory
Long Run Time	Compressor is running extremely	•	Low refrigerant charge.	Compressor run time is long
	long run cycles (typically for	• Evaporator blower is not running.
	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 lim-	•	High head pressure.	System pressure trip
Trip	its or compressor overloaded.	• Condenser coil poor air circulation (dirty,
			blocked, 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 defec-
			tive.
		• 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
			disconnect is low).
		• Excessive liquid refrigerant in compressor.
		• Compressor bearings have seized.
Table 6-6-Comfort Alert Outputs

ECT MODBUS The RS485 Network and Hardware Setup • 6-9