Question 1

ice is building up all over the coils inside even though the room is like 70 degrees. what's going on?

Accepted Answer

DIAGNOSIS Heavy icing in normal temps signals a problem with the defrost cycle, a dirty filter restricting airflow, or low refrigerant causing the coils to get too cold. FIX Turn the unit off and let the ice melt completely (do not chip it off). Once thawed, clean the rear air filter thoroughly. A clogged filter reduces airflow, causing the cold coils to freeze the moisture instead of condensing it. IF THAT DIDN'T WORK After a full thaw and with a clean filter, run it again. If it ices up within an hour, the defrost thermostat or control board may be faulty, failing to cycle the compressor off to melt the frost. This is a component-level repair. HEADS UP Running the unit while the coils are iced will damage the compressor. If you see ice, stop it immediately. Persistent icing is a serious symptom—if cleaning the filter doesn’t solve it, contact support as continued operation can kill the unit.

Question 2

it runs but collects barely any water, maybe a cup a day in my damp basement. used to work fine.

Accepted Answer

DIAGNOSIS Low water collection in a previously working unit is almost always one of three things: a filthy air filter, low ambient temperature, or a refrigerant leak (less common). FIX Clean the rear air filter first (see other question). That’s the fastest fix. Second, check the room temperature with a separate thermometer. If it’s below 65°F, the evaporator coils will frost up and the unit will cycle off on defrost, collecting very little. IF THAT DIDN'T WORK With the unit running, carefully feel the two metal coils behind the rear grille (don’t touch the fins). One should feel very cold and the other warm. If both feel barely cool or the same temperature, the refrigerant charge may be low, requiring a professional repair. HEADS UP The 4500 sq ft rating is for ideal conditions (warm, very humid air). In a cool 60°F basement, its efficiency drops dramatically. This is a limitation of all compressor-based dehumidifiers, not a defect.

Question 3

the continuous drain hose option isn't working, water just fills the bucket instead of going out the hose.

Accepted Answer

DIAGNOSIS Incorrect hose setup or an air lock in the line preventing proper siphon flow. The drain port is gravity-fed, so the hose must run downhill without any kinks or loops. FIX Unplug, empty bucket. Ensure the rubber drain port plug is completely removed. Push your vinyl hose onto the port firmly—it needs a tight seal. Run the hose in a straight, downward line to your floor drain or pump. For every foot the unit is off the ground, you need at least a quarter-inch of downward slope in the hose. IF THAT DIDN'T WORK Prime the hose. Detach it from the dehumidifier, pour a cup of water into the hose to fill the initial loop, then quickly reattach it to the port before the water drains out. This starts the siphon. HEADS UP Never let the hose end sit in standing water in a drain pan—this creates a back-pressure seal that stops flow. The hose end must be open to air, hanging freely into the drain.

Question 4

it won't turn on at all, no lights, nothing. checked the outlet and it's fine.

Accepted Answer

DIAGNOSIS Total power failure usually points to the internal fuse on the control board blowing, often from a power surge or compressor startup spike. FIX First, try a different, known-good outlet on a different circuit. If still dead, unplug it and check that the power cord is fully seated where it enters the back of the unit—sometimes it can get partially pulled out. IF THAT DIDN'T WORK The next step is checking the internal thermal fuse or main board fuse. This requires opening the cabinet near the power cord entry point. If you see a small, clear-glass fuse, test it with a multimeter. A blown fuse here is a common fix. HEADS UP If the internal fuse blew, it was likely for a reason like a voltage spike. Plugging the unit into a quality surge protector (not just a power strip) is non-negotiable for longevity, especially in older homes.

Question 5

how do i clean the filter on this thing? i can't find it in the manual and the front grill doesn't seem to come off.

Accepted Answer

DIAGNOSIS The air filter is behind the rear grille, not the front. It’s a common point of confusion and if it's clogged, performance plummets. FIX Unplug the unit. The filter is accessed from the back. Look for the large plastic rear grille. You should see two finger slots or tabs at the top. Pull the entire grille straight off. The washable foam filter is right behind it. Rinse it under lukewarm water, let it dry completely, and snap everything back. IF THAT DIDN'T WORK If the grille seems stuck, double-check there aren't any screws holding it on (some models have them at the bottom). Don’t force it. If the filter is damaged, you can run the unit temporarily without it, but order a replacement immediately. HEADS UP Clean this filter at least every two weeks during constant use. A dirty filter is the #1 cause of ‘my dehumidifier isn’t pulling water anymore’ complaints. Set a calendar reminder.

Question 6

the display says 'hi' or 'lo' and won't start dehumidifying, what does that mean?

Accepted Answer

DIAGNOSIS The unit is reading the room's ambient humidity and won't run because it's already at your target. 'HI' means current humidity is above your set point, 'LO' means it's below. FIX This is normal operation, not an error. If you want it to run to get humidity lower, press the ‘Humidity’ button to set a target lower than the current reading. If the display shows ‘LO’ and the room feels damp, the built-in hygrometer might be off. IF THAT DIDN'T WORK If it stubbornly shows ‘LO’ in a clearly damp room, unplug the unit for 5 minutes to reset the control board. When you plug it back in, it will recalibrate its sensor on startup. HEADS UP The humidity sensor is inside the unit, so placement matters. Don’t put it right next to a laundry machine or shower where it gets a localized blast of moisture, or in a dead-air corner. Central location in the space gives the most accurate reading.

Question 7

why is my homelabs 4500 so loud? it makes a constant rattling or buzzing noise, not just the normal fan sound.

Accepted Answer

DIAGNOSIS The noise is typically caused by the compressor or fan assembly vibrating against the cabinet or a loose internal component. FIX First, ensure the unit is on a solid, level floor—not on carpet or a wobbly surface. If it is, unplug it and check that the side and rear grilles are clean and unobstructed. A high-pitched buzz often means the fan blade is hitting a buildup of ice on the coils, which points to a room temperature issue (see below). IF THAT DIDN'T WORK A persistent metallic rattle could be a loose screw on the internal fan shroud or a compressor mount. This requires removing the outer cabinet, which may void your warranty if you’re not comfortable. HEADS UP These units are designed to run in temps above 65°F. Using it in a colder space (like a basement in winter) will cause the coils to frost over rapidly, making the compressor work harder and creating a different, cyclical buzzing noise.

Question 8

my homelabs dehumidifier runs for a few minutes then shuts off and the red 'bucket full' light comes on but the bucket is totally empty.

Accepted Answer

DIAGNOSIS This is almost always a dirty or misaligned float switch. The little plastic float inside the bucket well gets stuck in the ‘up’ position, tricking the unit into thinking it’s full. FIX Unplug the unit, pull out the bucket, and locate the small black plastic float at the back of the well. Manually press it down a few times to make sure it moves freely. While you're in there, wipe out any dust or debris in the well with a dry cloth that could be jamming it. IF THAT DIDN'T WORK Check that the bucket itself is seated perfectly. If it’s even slightly crooked or not pushed all the way in, it can hold that float up. Also, ensure the unit is on a perfectly level floor; being tilted back can cause this. HEADS UP This is a super common maintenance issue. Plan to check and clean that float well every couple of months during heavy use to prevent it from happening again.

hOmeLabs 4500 Sq Ft Energy Star Dehumidifier

Other Dehumidifiers