Aprilaire 8466 User Manual

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8400 Series Thermostats

READ AND SAVE THESE INSTRUCTIONS

Owner’s Manual

Includes

Operating Instructions and

Warranty Information

61000651C 8400 Tstat Owners.indd 1 10/13/09 11:13:35 AM

Other manuals for Aprilaire 8466

User Manual2 pages

Safety & Installation Instructions15 pages

Features2 pages

Questions and Answers:

A
Audrey GonzalezJul 25, 2025
What to do if the Aprilaire 8466 Thermostat heating system does not respond?
- E
  Emma HinesJul 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).
S
Sandra BarkerAug 1, 2025
Why is my Aprilaire Thermostat cooling system not responding?
- B
  Brittany BallAug 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.
P
parsonscollinAug 10, 2025
What to do if Aprilaire Thermostat heating equipment is running in cool mode?
- M
  Monica AtkinsonAug 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.
S
Steven HerreraAug 17, 2025
Why is my Aprilaire 8466 Thermostat heat pump blowing cool air in heat mode?
- K
  Kimberly PerkinsAug 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 8466 Specifications

General

Wi-Fi Connectivity	Yes
Humidity Control	Yes
Part Number	8466
Product Type	Thermostat
Compatibility	HVAC systems
Display	Backlit LCD
Programmable	Yes

Summary

Operation – All Models

Select System Mode

Guides on selecting system modes like HEAT, COOL, AUTO, OFF, and EM-HEAT.

Change Temperature Setting

Instructions on how to adjust the desired temperature setting for heating and cooling.

Operation – All Models (Continued)

Select Fan Setting

Explains how to choose fan settings: ON, AUTO, and CIRC for air circulation and cleaning.

Operation & Programming – Programmable Models Only

Set Time and Day

Step-by-step guide to setting the current time and day on the programmable thermostat.

Understanding Program Schedules

Operation & Programming – Programmable Models Only (Continued)

Progressive Recovery

Changing Program Schedules

Program Schedule Overrides

Electronic Thermostat Five Year Limited Warranty

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