Lennox LIFHC009180P431-C User Manual

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MIDDLE STATIC PRESSURE DUCT TYPE AIR CONDITIONER

Owner’s Manual

IMPORTANT NOTE:

Read this manual carefully before

installing or operating your new air

conditioning unit. Make sure to save

this manual for future reference.

Middle Static Pressure Duct Type

Model Numbers:

LIFHC009180P431-C LIFHC012180P431-C

LIFHC018180P431-C LIFHC024180P431-C

LIFHC036180P431-C LIFHC048180P431-C

LIFHC060180P431-C

Table of Contents

Questions and Answers:

M
mmartinezAug 10, 2025
What to do if my Lennox LIFHC009180P431-C Air Conditioner does not turn on?
- A
  Antonio Garcia MDAug 10, 2025
  If your Lennox Air Conditioner doesn't turn on when you press the ON/OFF button, there are a few potential reasons. Firstly, the unit might be in its 3-minute protection mode to prevent overloading; wait three minutes after switching it off before trying again. Secondly, on cooling and heating models, if the Operation light and PRE-DEF indicators are lit, or on cooling-only models, if the 'Fan Only' indicator is lit, the outdoor temperature might be too cold, activating the unit's anti-cold wind or anti-freeze protection. In this case, wait for the outdoor temperature to increase.
S
Sarah HollandAug 14, 2025
Why does my Lennox LIFHC009180P431-C change from COOL mode to FAN mode?
- J
  Jennifer MorrisAug 14, 2025
  If your Lennox Air Conditioner changes from COOL mode to FAN mode, it could be due to two reasons. First, the unit may be preventing frost from forming; it will resume cooling once the temperature increases. Second, the set temperature might have been reached, causing the compressor to turn off; it will resume operating when the temperature fluctuates.
C
Charles RiveraAug 19, 2025
Why is my Lennox LIFHC009180P431-C Air Conditioner indoor unit making noises?
- S
  Steven WilliamsAug 19, 2025
  If your Lennox Air Conditioner indoor unit makes noises, especially a squeaking sound when the system is OFF or in COOL mode, or when the drain pump is running, this is normal. Also, a squeaking sound may occur after running the unit in HEAT mode due to expansion and contraction of the unit’s plastic parts; this is also normal.
P
Peggy BaxterAug 25, 2025
Why are both the indoor and outdoor units of my Lennox LIFHC009180P431-C making noises?
- M
  martin73Aug 26, 2025
  If both the indoor and outdoor units of your Lennox Air Conditioner are making noises, specifically a low hissing sound during operation, this is normal. It's caused by refrigerant gas flowing through the units. This sound may also be heard when the system starts, stops, or is defrosting, due to the refrigerant gas stopping or changing direction.
B
brandy60Aug 29, 2025
Why does my Lennox Air Conditioner indoor unit emit white mist?
- T
  Tonya CareyAug 29, 2025
  If your Lennox Air Conditioner indoor unit emits white mist, this can occur in humid regions due to a large temperature difference between the room’s air and the conditioned air. This is a natural occurrence and requires no action.
O
owenslisaSep 3, 2025
What to do if both the indoor and outdoor units of my Lennox LIFHC009180P431-C emit white mist?
- C
  curtisandersonSep 3, 2025
  If both the indoor and outdoor units of your Lennox Air Conditioner emit white mist, this may happen when the unit restarts in HEAT mode after defrosting, due to moisture generated from the defrosting process. This is a natural occurrence, so no action is needed.

Lennox LIFHC009180P431-C Specifications

General

Brand	Lennox
Model	LIFHC009180P431-C
Category	Air Conditioner
Language	English

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