1. Introdución
The Aprilaire 8465 Programmable Thermostat provides precise control over your home's heating and cooling system. Designed for ease of use, this thermostat allows you to create personalized temperature schedules, helping to maintain comfort and potentially reduce energy consumption. It features a clear, backlit display and intuitive controls for managing your indoor climate.

Image 1.1: The Aprilaire 8465 Thermostat installed on a wall.
This manual provides detailed instructions for the installation, setup, operation, and maintenance of your Aprilaire 8465 thermostat. Please read it thoroughly before proceeding with installation or operation.
2. Información de seguridade
- Risco eléctrico: Disconnect power to the heating and cooling system at the main fuse or circuit breaker panel before installing or servicing the thermostat. Failure to do so may result in electrical shock or equipment damage.
- Instalación profesional recomendada: If you are unfamiliar with electrical wiring, it is recommended to have a qualified HVAC technician install this thermostat.
- Eliminación axeitada: Dispose of old batteries and the old thermostat according to local regulations. Do not incinerate.
- Temperatura de funcionamento: Ensure the thermostat is operated within its specified temperature range to prevent damage.
3. Contido do paquete
Comprobe que todos os compoñentes estean presentes antes de comezar a instalación:
- Aprilaire 8465 Programmable Thermostat
- Soporte de montaxe
- Porta da batería
- Guía de instalación (este documento)
Nota: Two AA batteries are required for operation but are non incluído no paquete.
4. Instalación
Follow these steps carefully to install your Aprilaire 8465 thermostat:
- Apagar a enerxía: Locate the circuit breaker or fuse box that controls your heating and cooling system and turn off the power.
- Eliminar o termostato antigo: Carefully remove the cover of your old thermostat. Take a picture of the wiring connections before disconnecting any wires. Label each wire with the terminal designation (e.g., R, C, Y, W, G).
- Montar a nova base do termostato: Detach the mounting bracket from the new Aprilaire 8465 thermostat. Position the mounting bracket on the wall where the old thermostat was located. Use the provided screws to secure it, ensuring it is level.
- Conecte cables: Connect the labeled wires from your HVAC system to the corresponding terminals on the new mounting bracket. Refer to the wiring diagram provided with your specific HVAC system for accurate connections. Ensure all connections are secure.
- Instalar baterías: Insert two new AA alkaline batteries into the battery compartment located behind the front battery door. Ensure correct polarity.
- Attach Thermostat to Base: Carefully align the thermostat body with the mounting bracket and push it firmly until it snaps into place.
- Restaurar enerxía: Volva conectar a corrente no disxuntor ou na caixa de fusibles.
5. Configuración e programación
After installation, the thermostat will power on. You will need to configure initial settings and program your desired schedule.

Image 5.1: Aprilaire 8465 Thermostat Display and Controls Overview.
5.1 Configuración inicial
- Establecer data e hora: Follow the on-screen prompts to set the current day of the week, time, and year. Use the UP e ABAIXO buttons to adjust values and the MODO or PROG botón para confirmar e pasar á seguinte configuración.
- Tipo de sistema: The thermostat may prompt you to confirm your HVAC system type (e.g., Heat Pump, Conventional). Select the appropriate option.
5.2 Programación da súa programación
The Aprilaire 8465 offers 5/2 day or 5/1/1 day programming. This allows you to set different schedules for weekdays (5 days) and weekends (2 days), or weekdays (5 days), Saturday (1 day), and Sunday (1 day).
- Entrar ao modo de programa: Preme o PROG button. The display will show the current program period (e.g., WAKE) and the day(s) being programmed.
- Select Program Period: Usa o MODO button to cycle through the four daily program periods: WAKE, LEAVE, RETURN, SLEEP.
- Axustar o tempo e a temperatura: For each program period, use the UP e ABAIXO buttons to set the desired start time and temperature for both heating and cooling.
- Advance to Next Day/Period: After setting a period, press PROG again to move to the next program period or day.
- Saír do modo de programa: Once all desired periods and days are programmed, press the CORRER button (or wait for the thermostat to automatically exit program mode after a period of inactivity).
Consello: To switch between 5/2 and 5/1/1 day programming, consult the advanced settings menu, typically accessed by holding down a combination of buttons (refer to the full user manual for specific button combinations).
6. Instrucións de funcionamento
Understanding the basic operation of your thermostat ensures optimal comfort and efficiency.
6.1 Selección do modo do sistema
Preme o MODO botón para percorrer os modos de sistema dispoñibles:
- CALENTACIÓN: The system will only heat your home to the set temperature.
- FRÍO: The system will only cool your home to the set temperature.
- AUTOMÁTICO: O termostato alterna automaticamente entre calefacción e refrixeración para manter o rango de temperatura configurado.
- OFF: The heating and cooling system is turned off. The fan can still be operated manually.
6.2 Control do ventilador
Preme o FAN botón para percorrer a configuración do ventilador:
- AUTOMÁTICO: O ventilador só funciona cando o sistema de calefacción ou refrixeración está en funcionamento.
- ACTIVADO: O ventilador funciona continuamente, independentemente de se o sistema de calefacción ou de refrixeración está activo.
6.3 Temporary Temperature Adjustment (HOLD)
To temporarily override the programmed schedule:
- Usa o UP or ABAIXO buttons to adjust the temperature. The new temperature will be held until the next programmed period begins.
- To cancel the temporary hold and resume the schedule, press the CORRER botón.
Para manter unha temperatura permanentemente, prema o botón ATENCIÓN button after adjusting the temperature. The thermostat will maintain this temperature until the ATENCIÓN button is pressed again to release it, or the CORRER preme o botón.
7. Mantemento
Un mantemento regular garante que o termostato funcione de forma eficiente e precisa.
7.1 Substitución da batería
The thermostat uses two AA alkaline batteries for backup power and display operation. A low battery warning will appear on the display when replacement is needed.
- Open the front battery door, typically located on the right side of the thermostat.
- Retire as pilas antigas.
- Insira dúas pilas alcalinas AA novas, asegurándose de manter a polaridade correcta (+/-).
- Pecha ben a porta da batería.
Nota: Replacing batteries typically does not erase your programmed schedule, but it is good practice to verify settings afterward.
7.2 Limpeza
Limpar o exterior do termostato cun pano suave eamp pano. Non empregue produtos de limpeza abrasivos nin disolventes, xa que poden danar o acabado ou os compoñentes internos.
7.3 Service Indicators
The Aprilaire 8465 thermostat includes indicators for various HVAC system components:
- Filtro de ar: An indicator will appear when it's time to check or replace your air filter.
- Humidifier/Dehumidifier: Indicators may signal maintenance for connected Aprilaire humidifiers or dehumidifiers.
- HVAC Service: A general service indicator may appear to suggest a professional HVAC system check.
Consult your HVAC system's manual or a qualified technician for specific maintenance procedures related to these indicators.
8 Solución de problemas
If you encounter issues with your Aprilaire 8465 thermostat, try the following solutions:
| Problema | Causa posible | Solución |
|---|---|---|
| Thermostat has no power/blank display | Dead batteries; Power off at circuit breaker; Loose wiring | Replace batteries; Check circuit breaker and turn on power; Verify wiring connections are secure. |
| O sistema non quenta/refría | Incorrect system mode; Temperature setting too high/low; HVAC system issue | Ensure thermostat is in HEAT or COOL mode; Adjust set temperature; Check HVAC unit for power or error codes; Contact HVAC technician. |
| A programación programada non se está executando | Thermostat in HOLD mode; Incorrect time/day setting | Press RUN to exit HOLD mode; Verify current time and day are set correctly. |
| Lectura de temperatura inexacta | Thermostat exposed to direct sunlight or drafts; Sensor obstruction | Relocate thermostat if possible; Ensure no objects block airflow to the sensor. |
If problems persist after attempting these solutions, contact Aprilaire customer support or a qualified HVAC technician.
9. Especificacións
| Característica | Especificación |
|---|---|
| Marca | Aprilaire |
| Nome do modelo | AprilAire 8465 |
| Tipo de controlador | Táctil (control por botón) |
| Característica especial | Programable |
| Cor | Branco |
| Usos específicos | HVAC Systems with Humidifiers, Dehumidifiers, and Air Filters |
| Tipo de control de temperatura | Programable |
| Tecnoloxía de conectividade | Con cable |
| Fonte de enerxía | Wired (HVAC system), Battery Powered (2x AA for backup/display) |
| Material | Plastic, Glass/Plastic Composite, Rubberized Plastic |
| Forma | Rectangular |
| Tipo de visualización | LCD |
| Tipo de acabado | Mate |
| Tamaño da pantalla | 2.12 polgadas |
| Tipo de montaxe | Soporte de parede |
| Retroiluminación | Yes (Auto-activated with first button press) |
| Peso do elemento | 6.4 onzas |
| Dimensións do produto | 5.25 x 4.5 x 1 polgadas |
| UPC | 686720846502 |
| Fabricante | CORPORACIÓN DE PRODUCTOS DE INVESTIGACIÓN |
| Número de peza | 8465 |
10. Información da garantía
Aprilaire products typically come with a limited warranty covering defects in materials and workmanship. The specific terms and duration of the warranty may vary. Please retain your proof of purchase.
For detailed warranty information, including coverage period and how to make a claim, please visit the official Aprilaire websitio web ou póñase en contacto directamente co servizo de atención ao cliente.
11. Apoio
Para obter máis axuda, soporte técnico ou para consultar sobre pezas de reposto, utilice os seguintes recursos:
- Aprilaire Official Websitio: Visita www.aprilaire.com for product information, FAQs, and additional support documents.
- Atención ao cliente: Refer to the Aprilaire website for current customer service contact numbers and hours of operation.





