How often the filter is checked
The U.S. Department of Energy Energy Saver guide says to clean or replace filters on furnaces once a month or as recommended. Energy Saver guide (opens in a new tab) ↗
ENERGY STAR says to inspect, clean, or change air filters once a month. ENERGY STAR maintenance checklist (opens in a new tab) ↗
Codes that name it
Amana
- Amana furnace EE3:
Blocked filters
Amana and Goodman *CVC96 / *MVC96 two-stage furnace installation instructions (IOG-2015L) (opens in a new tab) ↗ - Amana furnace EEd:
Blocked filters or ductwork
Amana and Goodman *CVC96 / *MVC96 two-stage furnace installation instructions (IOG-2015L) (opens in a new tab) ↗
Bryant
- Bryant furnace 33:
Dirty filter or restricted duct system
Bryant 80% variable-speed two-stage furnace troubleshooting guide (Catalog No. TG-GFB80-02) (opens in a new tab) ↗
Carrier
- Carrier furnace 13:
Dirty filter or restricted duct system
Carrier 59SC5 installation, start-up and operating instructions (opens in a new tab) ↗ - Carrier furnace 33:
Dirty filter or restricted duct system
Carrier 59SC5 installation, start-up and operating instructions (opens in a new tab) ↗
Goodman
Lennox
- Lennox furnace Red slow flash, green on:
Turn off power and check the air filter; replace if dirty
Lennox ML180UH installation and operation manual (opens in a new tab) ↗
Rheem
Trane
- Trane furnace E04:
Dirty filters or blower wheel
Trane S9V2 Service Facts (S9V2-SF-2A-EN) (opens in a new tab) ↗
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