Troubleshooting, Error Codes, Thermostat Features

Troubleshooting

Display is blank

•Check circuit breaker and reset if necessary.

•Make sure power switch at heating & cooling system is on..

•Make sure furnace door is closed securely.

•If thermostat is battery powered, make sure fresh AA alkaline batteries are correctly installed..

Temperature settings do not change

Heat pump issues cool air in heat mode, or warm air in cool mode

•Check System Setting 31 (O/B Operation) to make sure the reversing valve operation matches the heat pump..

Heat/cool both on at same time

• Check SW1 (Equipment Type), to make sure it is set

to match the installed heating/cooling equipment

(see page 8)..

Error Codes

If the thermostat enters an error mode, all outputs are turned off. The thermostat attempts to recover every 10 minutes. If the error does not clear, use the reset button. This will return all settings back to factory default.

Error code	Message	Error Description

01	“SENSOR ERROR”	Open temperature sensor circuit

02		Shorted temperature sensor circuit
02		Shorted temperature sensor circuit

04	“EEPROM ERROR”	Error in permanent memory

Make sure heating and cooling temperatures are set to acceptable ranges:

•Heat: 40° to 90°F (4° to 32°C).

•Cool: 50° to 99°F (10° to 37°C).

Heating system does not respond (“HEATING” appears on screen)

•Check for 24VAC at the equipment on the secondary side of the transformer between power and common. If voltage is not present, check the heating equipment to find the cause of the problem..

•Check for 24VAC between the heat terminal (W) and the transformer common. If 24VAC is present, the thermostat is functional.. Check the heating equipment to find the cause of the problem..

•Check for loose or broken wires between the thermostat and the heating equipment..

Cooling system does not respond (“COOLING” appears on screen)

•Check for 24VAC at the equipment on the secondary side of the transformer between power and common. If voltage is not present, check the cooling equipment to find the cause of the problem

•Check for 24VAC between the cooling terminal (Y) and the transformer common. If 24VAC is present, the thermostat is functional.. Check the cooling system to find the cause of the problem..

•Check for loose or broken wires between the thermostat and the cooling equipment..

Fan does not turn on in a call for heat

•Check System Setting 05 (Fan Control), to make sure the fan control is properly set to match the type of system (see page 8)..

• Check to make sure heating and cooling wires are

not shorted together..

Heating equipment is running in cool mode

•Check SW1 (Equipment Type), to make sure it is set to match the installed heating/cooling equipment (see page 8)..

“HEATING” is not displayed

•Check Installer System Setting number 01

(Control Setup) is set correctly..

•Change the System Mode to Heat, and set the temperature level above the current room temperature..

“COOLING” is not displayed

•Check Installer System Setting number 01

(Control Setup) is set correctly..

•Change the System Mode to Cool, and set the temperature level below the current room temperature..

Humidifier does not operate in Auto Mode

•Check Installer System Setting number 11 (Outdoor

Sensor) is set to yes..

•Verify that the outdoor sensor is functioning correctly.. If the sensor is functioning correctly the outdoor temperature will display in the outdoor temperature location (see Home Screen on page 17 for the location)..

Thermostat Features

•Indoor air quality control.

–Humidification automatic or manual control..

–Dehumidification..

–Event-Based™air cleaning..

–Ventilation with temperature and humidity limits..

•Temperature control.

•Heat Blast™ raises the room temperature 3°F to 5°F.

•Large touch screen with adjustable backlight – constant backlight option available..

•Message center provides feedback and instructions.

•7 day programmability or separately programmable weekday/weekend schedules..

•Thermostat can be removed from the wall for easy programming (batteries must be installed)..

•Dual power option (24VAC or battery).

•Front battery door access for fast, easy replacement.

•Displays room temperature, room humidity, temperature setting, and outdoor temperature.

•Air filter, humidifier, dehumidifier, and HVAC service reminders..

•Programmable fan control with fan circulation mode.

•Easy to use temperature control can override program schedule at any time..

•Progressive recovery ensures proper temperature at the start of a program event..

•Built in compressor protection prevents damage to your equipment..

•System test mode.

8620 specifications

The Aprilaire 8620 is a cutting-edge thermostat designed to enhance home comfort while promoting energy efficiency. This advanced device combines innovative features and smart technology, making it an ideal choice for homeowners seeking to optimize their HVAC systems.

One of the standout features of the Aprilaire 8620 is its user-friendly interface. The thermostat boasts a large, easy-to-read display that allows users to quickly navigate through its settings. This intuitive design ensures that adjusting temperature settings or changing modes is a hassle-free experience. The backlit screen is especially beneficial in low-light situations, providing visibility for users at any time of day.

The Aprilaire 8620 is equipped with a programmable scheduling feature that enables users to create tailored heating and cooling schedules. This functionality allows homeowners to set specific temperatures for different times of the day, ensuring maximum comfort when they are home while minimizing energy use when away. The advanced programming capability promotes energy savings by automatically adjusting the temperature settings based on user preferences and daily routines.

Furthermore, the thermostat incorporates Wi-Fi connectivity, allowing for remote access through a smartphone application. This feature enables users to monitor and adjust their home’s temperature from anywhere, providing ultimate control and flexibility. Notifications and alerts can also be sent to the user’s mobile device, ensuring they are always informed about their HVAC system's performance.

Another key characteristic of the Aprilaire 8620 is its compatibility with multiple heating and cooling systems. Whether a home utilizes a single-stage or multi-stage system, the thermostat can seamlessly integrate, providing a versatile solution for various HVAC setups. This compatibility ensures that users can make the most of their existing equipment without costly upgrades.

Additionally, the thermostat offers advanced humidity control features, which work in conjunction with Aprilaire's whole-home humidifiers and dehumidifiers. This technology not only improves overall indoor air quality but also enhances comfort levels by managing humidity effectively, preventing issues like mold growth and allergens.

In summary, the Aprilaire 8620 stands out as a premium thermostat option that combines user-friendly design, programmable scheduling, Wi-Fi connectivity, compatibility with multiple systems, and advanced humidity control. With its suite of features and smart technology, it represents a significant investment in home comfort and energy efficiency for any homeowner.