The ‘In Recovery’ message on a thermostat indicates that the system is actively working to reach a programmed target temperature. This typically occurs during a scheduled transition between different temperature settings.
Econo on an air conditioner typically refers to an Economy mode that reduces energy consumption by cycling the compressor on and off or adjusting fan speed. This setting balances cooling with lower electricity use, often at the expense of faster or more consistent temperature control.
EM heat, often labeled as “Emergency Heat” on thermostats, is a backup heating mode used with heat pump systems. It activates the auxiliary heating element when the heat pump cannot meet the temperature demand. Understanding when and why EM heat engages helps homeowners manage energy usage and maintain comfort.
The “Run” indication on a thermostat signals that the heating or cooling system is operating continuously, bypassing normal schedules. It is commonly used for testing, defrost cycles, or when a steady temperature is required.
In security systems, “AC loss” signals that the alternating‑current (mains) power supply has been interrupted. The event typically triggers an alarm, switches to backup power, and alerts the monitoring service.
Emergency heat is a setting on heat pump systems that bypasses the heat pump’s primary cycle to rely solely on auxiliary heating sources. It is typically used when the outdoor temperature is too low for the heat pump to operate efficiently or during equipment failure.
Low subcooling occurs in refrigeration and air conditioning systems when the liquid refrigerant does not cool sufficiently below its saturation temperature before reaching the expansion valve. This condition typically indicates a refrigerant shortage or a restriction in the system.
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The ‘Hold’ setting on an air conditioner is a thermostat function that maintains a constant temperature regardless of a pre-programmed schedule. It overrides automatic changes to ensure a steady indoor climate.
The ‘Hold’ function on a Honeywell thermostat allows a user to override a pre-programmed temperature schedule. When active, the device maintains a single constant temperature until manually released.