Please ensure Javascript is enabled for purposes of website accessibility Dri-Eaz Crawlspace Dehumidifiers | FAQ/Support
How many square feet can a PHD 200 cover?
Because the height of crawlspaces, basements and other areas can vary widely, we recommend sizing the job with cubic dimensions, not square feet. Refer to our Sizing Page for details.
What’s the smallest space in which I can use a PHD 200?
The humidistat function allows the unit to precisely control humidity and to operate at maximum efficiency in all types of environments. This means the PHD 200 is very effective even in small spaces, provided there is good air circulation around the unit and to all areas in the space. In smaller spaces, the unit will automatically turn off for longer intervals once the set level of humidity is reached.
Can the PHD 200 operate in cold temperatures?
The unit does not operate efficiently in conditions below 45°F or less than 40% RH and will automatically turn itself off. Fortunately, mold growth or other microbial activity is unlikely to occur in this kind of environment. If you expect conditions to remain below 45°F or 40% RH for an extended period of time, we recommend turning the unit off until the temperature and humidity rise above these levels.
Will freezing temperatures damage my PHD 200?
If you expect the unit to be exposed to freezing temperatures, we recommend taking the following steps to protect your unit. You can find detailed instructions in the Owner's Manual.
  1. Press the Purge Button to remove any water remaining in the drip pan
  2. Unplug the unit and wait for at least 30 minutes. This will allow any water remaining on the coils to drip into the drip pan.
  3. Press Purge Button again to remove any remaining water.
  4. Wipe the drip pan dry.
  5. Disconnect the drain hose and drain out any remaining water from the hose.
  6. Reinstall drip pan and drain hose.
  7. Leave the unit unplugged until above-freezing temperatures have resumed.
  8. Remember to turn the unit back on!
The dehu has stopped running and there’s an “ER9” code on the display.
“ER9” most likely means the pumpout system is clogged and needs to be cleaned. If the ER9 code appears, first unplug the unit and then plug it back in. This will usually reset the electronics, and the unit will begin operating normally. If the error message reappears, check for obstructions or kinks in drain hose, and clean the drain pan and float switch. Complete instructions can be found in the PHD 200 Owner's Manual, available on the dehumidifier product page.
How often should I change the air filter?
The filter should be changed whenever the accumulation of dust and debris is visible. To protect your dehumidifier and preserve your warranty protection, do not attempt to clean and reuse the filter, and use only Dri-Eaz disposable air filters, reorder 116689 (3 pack).
How long is the drain hose?
The PHD 200 drain hose is 20 ft. long. Note that the rise from the dehumidifier to the end of the hose should not exceed 3 vertical feet. In most cases, mounting the dehumidifier from the floor joists (use the Suspension Kit), makes it easy to meet this requirement. If you need a higher pumpout lift, we recommend our CMC 200 dehumidifier, available from Terminix or the Dri-Eaz Revolution LGR, our professional restoration dehumidifier, available from our network of Legend Brands Restoration distributors. Both the CMC 200 and the Revolution are capable of up to 30 ft. of vertical lift and are equipped with 40 ft. drain hoses, making them ideal for deep basements or other locations where a suitable drain less than 3 ft. above your installation is not available.
Water drips out when moving unit
Unit was unplugged before purging was complete.
Purge unit before moving.
Unit does not operate
Unit not switched on.
Switch unit on.
No power to machine.
Plug in unit; check power cord connection at wall outlet and at base of unit. Check circuit on which unit is operating.
The unit automatically shuts itself off in conditions below 45°F or less than 40% RH.
No action required. Unit will automatically resume operation when temperature and humidity rises above these levels. IMPORTANT: Protect the unit from freezing. Please refer to "Will freezing temperatures damage my PHD 200?" above.
Unit operating, but space still damp
Not enough time to reach target humidity level.
Allow more time for drying.
Dehumidifier capacity not adequate for area.
Poor circulation in space.
Increase air movement by repositioning the dehumidifier and/or adding air movers.
Excessive moist air infiltration.
Seal off area to reduce infiltration.
Unit collects too little water
Air is drier than humidistat setpoint.
Check humidistat setpoint and confirm humidity level with hygrometer.
Crawlspace temperature is too low.
Increase ambient temperature by adding heat.
Air filter is blocked.
Check filter. Clean or replace as necessary.
Heat exchange block and/or coils are clogged.
Check heat exchange block and coils. Clean as necessary.
If the problem you are experiencing is not listed here, contact us at or email