Aprilaire 8465 Safety & Installation Instructions

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8400 Series Thermostats

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Safety &

Installation

Instructions

Table of Contents

Other manuals for Aprilaire 8465

Owner's Manual12 pages

User Manual2 pages

Features2 pages

Questions and Answers:

J
John MayJul 25, 2025
What to do if the Aprilaire 8465 heating system does not respond?
- B
  Brian AndersonJul 25, 2025
  If your Aprilaire thermostat's heating system isn't responding ('HEATING' appears on the screen), try these steps: First, check the circuit breaker and reset it if needed. Next, ensure the power switch at your heating and cooling system is turned on. Also, make sure the furnace door is securely closed. If your thermostat uses batteries, ensure fresh AA alkaline batteries are correctly installed. Finally, verify that your heating temperature is set between 45° to 90°F (7° to 32°C).
B
blanchardkevinAug 1, 2025
Why is my Aprilaire 8465 Thermostat cooling system not responding?
- B
  brandonstrongAug 1, 2025
  If your Aprilaire thermostat's cooling system isn't responding ('COOLING' appears on the screen), consider the following: Check for 24 VAC at the equipment on the secondary side of the transformer between power and common. If voltage is absent, inspect the cooling equipment to identify the problem. Verify there's 24 VAC between the cooling terminal (Y) and the transformer common. If present, the thermostat is likely functional, so check the cooling system. Inspect for loose or broken wires between the thermostat and the cooling equipment. Ensure SW1 (Equipment Type) is correctly set to match your installed heating/cooling equipment. Lastly, confirm that heating and cooling wires are not shorted together.
J
Janice CummingsAug 9, 2025
What to do if Aprilaire Thermostat heating equipment is running in cool mode?
- K
  Kelly JohnsonAug 10, 2025
  If your heating equipment is running in cool mode on your Aprilaire Thermostat, you can try the following: Check System Setting #02 (Fan Control) to ensure the fan control is correctly set to match your system type. Also, change the System Mode to Heat and set the temperature higher than the current room temperature.
G
grossshannonAug 17, 2025
Why is my Aprilaire 8465 Thermostat heat pump blowing cool air in heat mode?
- D
  Donna HallAug 17, 2025
  If your heat pump is blowing cool air in heat mode, or warm air in cool mode, with your Aprilaire Thermostat, check System Setting #12 (Reversing Valve). You can also try changing the System Mode to Cool, and set the temperature level below the current room.

Aprilaire 8465 Specifications

General

Model Number	8465
Category	Thermostat
Type	Programmable
Compatibility	HVAC systems
Display	Color Touchscreen
Connectivity	Wi-Fi
Humidity Control	Yes
Schedule	7-day programmable
Geofencing	Yes
Temperature Control	Yes
Ventilation Control	Yes
Dehumidification Control	Yes
Indoor Humidity Display	Yes
Outdoor Temperature Display	Yes
Backlight	Yes
Installation	Professional installation recommended
Stages	2 heating, 2 cooling

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