Aprilaire 8910 Troubleshooting, Error Codes, Home Comfort Control Features

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Quick Reference to controls & Display

Equipment Control Module LEDs

POWER/STATUS – On solid during normal operation.. Flashes when connection to the thermostat is lost and at power-up while the thermostat connection is being established..

HEATING – On when heating outputs are active.. COOLING – On when cooling outputs are active.. FAN – On when fan output is active..

HUMIDIFIER – On when humidifier output is active.. DEHUMIDIFIER – On when dehumidifier output is active.. VENTILATION – On when ventilation output is active.. AIR CLEANING – On when air cleaner output is active..

Troubleshooting

Heat/cool both on at same time

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

•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 11)..

“HEATING” is not displayed

•Check Installer System Setting number 05

(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 05

(Control Setup) is set correctly..

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

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.

Troubleshooting

Display is blank

If Power LED not illuminated at the equipment control module check the following..

•Check circuit breaker and reset if necessary.

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

•Make sure furnace door is closed securely.

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,

Error code

Message

Error Description

 

 

 

01

“SENSOR ERROR”

Open temperature sensor circuit

 

 

02

Shorted temperature sensor circuit

 

 

 

 

03

“EEPROM ERROR”

Error in permanent memory

 

 

 

05

“LOST SYSTEM CONNECTION”

Thermostat lost connection to equipment interface module

 

 

 

HOME COMFORT CONTROL™ Features

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 Home Comfort Control is functional.. Check the heating equipment to find the cause of the problem..

•Check for loose or broken wires between the Home

Comfort Control and the heating equipment..

the Home Comfort Control is functional.. Check the

cooling system to find the cause of the problem..

• Check for loose or broken wires between the Home

Comfort Control and the cooling equipment..

Fan does not turn on in a call for heat

•Check System Setting 09 (Fan Control), to make sure the fan control is properly set to match the type of system..

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

•Check wiring at the terminal block to confirm the reversing valve is connected to the proper terminal..

O is active in cooling and B is active in heating.

•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..

•Support for optional wireless outdoor temperature sensor..

•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)..

•Front battery door access for fast, easy replacement.

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

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Page 11 Page 13
Contents Safety Installation Instructions Table of contentsInstallation Equipment Control Module Wiring Outdoor temperature sensorOutdoor temperature sensor should be mounted Optional wireless Outdoor temperature sensorReturn Air Temperature Sensor Optional Leaving Air Temperature Sensor OptionalC can be Powered from Powered 24VACIndoor Air Quality Wiring Diagrams ThermostatPower & Reset options Setup & TestingEquipment Type Selection Switch SW1 Change System SettingsHvac Installer System Settings Table Indoor Air Quality System SettingS Tables Air Cleaning System Settings TableHumidifier System Settings Table Dehumidifier System Settings TableVentilation System Settings Table How to enter the system test menuSystem test menu System Test StepsSystem test Tables AuxQuick Reference to controls & Display Home ScreenMain Menu Y3/OTroubleshooting Error CodesHome Comfort Control Features Specifications EnvironmentElectrical
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Manual 19 pages 635 b

8910 specifications

The Aprilaire 8910 is a state-of-the-art thermostat designed to provide homeowners with precise control over their indoor climate. This smart thermostat is equipped with advanced features that enhance comfort while promoting energy efficiency.

One of the standout features of the Aprilaire 8910 is its intuitive touchscreen interface. The large, easy-to-read display allows users to navigate through a variety of settings with ease. The touchscreen is responsive and provides a seamless user experience, making it simple to adjust temperature settings or program schedules.

The Aprilaire 8910 supports both heating and cooling systems, offering flexibility for homeowners with diverse HVAC setups. It is compatible with forced air, heat pump, and radiant systems, as well as multi-stage heating and cooling setups, making it a versatile option for any home.

One of the key technologies integrated into the Aprilaire 8910 is its ability to manage humidity levels. The thermostat works in conjunction with whole-home humidifiers and dehumidifiers, allowing users to maintain optimal humidity levels for health and comfort. This feature is particularly beneficial in climates where humidity fluctuations can lead to discomfort or damage to home interiors.

The 8910 also boasts Wi-Fi connectivity, enabling remote access and control through a smartphone app. This feature allows homeowners to monitor and adjust their home's temperature and humidity levels from anywhere, ensuring comfort upon returning home. The app provides real-time updates and alerts, helping users stay informed about their HVAC system’s performance.

Another notable characteristic of the Aprilaire 8910 is its energy-saving capabilities. The thermostat offers programmable and adaptive scheduling options, allowing users to set different temperature schedules for weekdays and weekends. This reduces energy consumption and helps lower utility bills, all while maintaining a comfortable living environment.

With a sleek design and high-quality build, the Aprilaire 8910 is not only functional but also aesthetically pleasing. It can blend seamlessly with any home decor, making it an attractive addition to any wall.

In summary, the Aprilaire 8910 is a sophisticated thermostat that combines user-friendly technology with energy-efficient features. Its touchscreen interface, humidity control, Wi-Fi connectivity, and energy-saving programming make it a top choice for homeowners seeking ultimate comfort and convenience in climate control.
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