Honeywell THM5421C1008 Benutzerhandbuch

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4. To cancel the Vacation Hold override early, press the 

Cancel key.

NOTE: When the number of days of Vacation Hold expires, 

the screen shows “Following Schedule” to indicate 

that Vacation Hold has ended.

SOUTHERN DEHUMIDIFICATION AWAY SETTING
Southern Dehumidification Away Setting is an option that only 

appears if ISU number 390 is set to yes. It can be used to 

maintain the desired humidity level and temperature in the 

living space while away for extended periods of time. See ISU 

Numbers 390–394 for more information.

1. Press Hold three times to enter the Southern Dehumidifi-

cation Away Setting.

2. These settings can only be changed in installer setup. 

The thermostat has a touch screen interaction. Follow these 

steps to clean the screen without making thermostat changes:

1. Press the Screen key. Thermostat locks out all touch 

keys for 30 seconds to allow for cleaning. 

2. Use damp cloth slightly moistened with water or house-

hold glass cleaner to clean the screen.

3. Repeat the above steps, as necessary.

4. Press the Done key to return to the Home Screen and 

normal operation.

When partially locked, the screen indicates Screen Locked for 

5 to 7 seconds whenever the user attempts to press a key that 

is locked. Pressing a locked key, while Screen Locked is 

shown, flashes “Screen Locked” on the screen.

In this mode, all keys are locked except the Temperature Up 

and Down arrow keys:

— User can change temperature up or down but cannot 

change schedule settings.

— Temporary temperature change lasts until next scheduled 

period and that time shows on screen. 

— To cancel temperature override and begin following 

schedule, press Cancel key.

— To unlock screen, see Installer Setup section.

In this mode, all keys are locked and not functional. To unlock 

screen, see Installer Setup section. The screen continuously 

displays “Screen Locked.”

If you have a humidifier and outdoor temperature sensor, you 

can use Frost Control to reduce window condensation.

1. Press MORE until the humidifier screen is displayed.

2. Press the Up or Down arrow to set the humidity and 

Frost Control level. (Use a lower Frost Control level if 

frost appears on windows. Use a higher setting if the air 

is too dry.)

3. Press DONE to save and exit, or press CANCEL to exit 

without saving changes.

NOTE: If you do not have an outdoor temperature sensor, the 

Frost Control level will not be displayed.

If installed to control a dehumidifier, the thermostat can activate 

it as needed to reduce humidity.

MORE

CANCEL

FRI

AUTO

HEAT

COOL

DEHUMIDIFIER

M23521

M19964

SCHED

HOLD

CLOCK SCREEN

MORE

TUE

FAN

AUTO

SYSTEM

COOL

Following

Schedule

Inside

Set 

 SCREEN LOCKED

M23509