Home » Honeywell » Thermostats » Honeywell RTH8500D

Honeywell RTH8500D Support Question

Find answers below for this question about Honeywell RTH8500D - 7-Day Touchscreen Universal Programmable Thermostat.
Need a Honeywell RTH8500D manual? We have 1 online manual for this item!

Honeywell Overview Questions Manuals Reviews Videos Research

Question posted by doantx2009 on December 31st, 2014

Why Couldnot Adjust The Temperature At The Display? How To Adjust It ?

The temperature at the display of my honeywell thermostat are always 78 (heating mode ) and 76 ( cooling mode ). I tried to adjust it but there is no change. I didnot know why happened this thing. And how to adjust it. Please help me. Thanks a lot. Van Doan.

I Know the Answer!

I have the same question
Request More Information

Current Answers

Answer #1: Posted by waelsaidani1 on December 31st, 2014 10:18 PM

This answer was accepted by the poster of the original question.

waelsaidani1

Member since:
May 12th, 2013

Points: 19,501,797

1,100
points

Press

HOLD to permanently adjust the temperature. This will turn off the program schedule.

Whatever temperature you set will be maintained 24 hours a day until you manually change it or press

CANCEL (or SCHED) to cancel "Hold" and resume the program schedule.

Answer #2: Posted by TechSupport101 on December 31st, 2014 9:48 PM

TechSupport101

Member since:
May 24th, 2013

Points: 12,171,305

90
points

Hi. The Owner's Manual here

http://www.helpowl.com/manuals/Honeywell/RTH8500D/48358

should be able to walk you through. Unfortunately, if the thermostat will still not budge though operated as per the manual, then it may be faulty.

www.satechhelp.co.za

Related Honeywell RTH8500D Manual Pages

Owner's Manual - Page 2

... Set the Calendar 24 Configure Installer Setup 26 Get to Know Your Thermostat Display 38 Set System Setting 40 Program Your Heating and Cooling Schedule 42 Cancel a Schedule Period 46 Set Time 47 Set Temperature Overrides 48 Clean Your Thermostat Screen 51 Use Your Filter Timer 52 Understanding Temperature Recovery Feature 53 Replace Batteries 54 Review Battery Tips...

Owner's Manual - Page 24

Step 10. Set the Calendar This thermostat is designed to automatically keep current time and day in memory for instructions. 69-1725-1 24 Use the arrow keys to set . Press the...MON TUE WED THU FRI DONE USE ARROWS TO SET YEAR M22226 The calendar can be set the year, month and day. 2. See Step 11, Configure Installer Setup, for up to ten years, under normal use, once the calendar is ...

Owner's Manual - Page 27

Release the center key when the display on your thermostat matches the display below. TUE CHANGE FILTER UV LAMP HUMIDIFIER PAD Inside Set To SYSTEM EM HEAT OFF COOL Following Schedule PM DONE CANCEL M19969 4. MON WED THU FRI SAT SUN DONE 27 M22214 69-1725-1 Step 11. Configure Installer Setup (Cont) 3. Press and ...

Owner's Manual - Page 30

Step 11. Thermostat controls fan in a call for Installer Setup Number 0180. 12. After you have a number 0180 on the left side of your display, press the Up or Down arrow to select your setting for heat. Heating system controls fan in a call for heat. 1 - UP ARROW SETTING INSTALLER SETUP NUMBER DONE PRESS TO EXIT INSTALLER...

Owner's Manual - Page 33

Configure Installer Setup (Cont) 19. Fahrenheit Temperature Display. Celsius Temperature Display. Scale M22218 33 69-1725-1 UP ARROW SETTING INSTALLER SETUP NUMBER DONE PRESS TO EXIT INSTALLER SETUP UP ARROW DOWN ARROW Installer Setup Number Installer Setup Name (Select Your Setting) Settings 0320 Temperature 0 - After you select your setting, press the Up arrow to go to...

Owner's Manual - Page 34

... Installer Setup Number 0330 Installer Setup Name Daylight Savings (Select Your Setting) Settings 0 - Daylight Savings is Off -- clock will automatically adjust for Daylight Savings Time. 1 - Step 11. clock will not adjust for Daylight Savings Time. After you select your setting for Installer Setup Number 0330. 22. Configure Installer Setup (Cont) 21. M22219...

Owner's Manual - Page 38

... RAISES TEMPERATURE SETTING Set To Following Schedule SCHED HOLD CLOCK SCREEN MORE SCHED CLOCK ENTERS SETS THE SCHEDULING TIME MODE FORWARD HOLD OR BACK SETS A PERMANENT HOLD AND ACTIVITIES VACATION HOLD MORE SHOWS FURNACE FILTER CHANGE REMINDER SCREEN LOCKS OUT THE SCREEN TO ALLOW FOR CLEANING M22238 69-1725-1 38 Get to Know Your Thermostat Display Thermostat...

Owner's Manual - Page 39

Get to Know Your Thermostat Display (Cont) Display TUE SHOWS CURRENT DAY OF THE WEEK FAN SHOWS FAN SETTING INSIDE TEMPERATURE SHOWS THE CURRENT INSIDE TEMPERATURE SET TO TEMPERATURE SHOWS THE CURRENT SET TEMPERATURE TUE FAN Inside AUTO Set To SYSTEM HEAT Following Schedule AM SCHED HOLD CLOCK SCREEN MORE SYSTEM SHOWS CURRENT SYSTEM POSITION TIME DISPLAY CURRENT TIME OF DAY, HOLD TIME...

Owner's Manual - Page 40

... Damage Hazard. Do not operate cooling system when outdoor temperature is not operational. Set System Setting Set System Setting Press the System button to select Heat, Off or Cool: Heat-Thermostat controls the heating system. Heat (Heat Pump Systems with Auxiliary Heat)- Heat Pump compressor is below 50 °F (10 °C). FAN AUTO Inside SYSTEM HEAT THU Set To Following Schedule AM...

Owner's Manual - Page 42

...-Period when you are asleep and want an energysaving temperature. Sleep-Period when you are away from home and want an energy-saving temperature. Edit Schedule 1. Press Sched key. Program Your Heating and Cooling Schedule Your thermostat can control up to four different schedule periods per day: Wake-Period when you awaken and want your home...

Owner's Manual - Page 44

...-1725-1 44 Check marks appear next to modify time and heat and cool temperatures from this screen. 6. These days are scheduled with the same times and temperatures. MON TUE WED THU FRI FAN ON AUTO CIRC OK TO PICK MULTIPLE DAYS CANCEL PERIOD SAT SUN HEAT AM COOL DONE WAKE LEAVE RETURN SLEEP CANCEL M22300 4. Press Up and...

Owner's Manual - Page 46

.... 2. Once selected, the period flashes. 5. MON TUE WED THU FRI OK TO PICK MULTIPLE DAYS FAN SAT SUN HEAT COOL DONE 6. Press schedule period you can cancel the Leave and Return periods (the thermostat would then control to the Wake temperature until the Sleep period). 1. Press Cancel Period key. Press Done key. WAKE LEAVE RETURN...

Owner's Manual - Page 48

...Time Up and Down arrows are shown for the thermostat to cancel "Hold Temperature Until" and resume schedule. Set Temperature Overrides Hold Temperature Until (Temporary Hold) Hold temperature temporarily until the next scheduled period time or until.... TUE FAN AUTO Inside Set To SYSTEM HEAT Hold Temperature Until PM SCHED HOLD CLOCK SCREEN CANCEL M19959 3. Press the Up or Down arrow...

Owner's Manual - Page 49

...-1 TUE FAN Inside AUTO Set To SYSTEM HEAT AM Permanent Hold SCHED HOLD CLOCK SCREEN CANCEL M19960 3. Press the Up or Down arrow next to the temperature you want to cancel "Permanent Hold" and resume the schedule. Set Temperature Overrides (Cont) Permanent Hold Permanent Hold changes the temperature setting until it is cancelled. 1. "Permanent Hold...

Owner's Manual - Page 50

... (Cont) Vacation Hold Changes temperature setting for a designated number of days you desire the thermostat to set the desired temperature while away on the screen. (This is shown on vacation. Notice that Vacation Hold has ended. 69-1725-1 50 Screen shows "Hold Temperature Until" 1 day. 3. FAN Inside AUTO THU Set To SYSTEM HEAT Hold Temperature Until DAYS SCHED CLOCK SCREEN...

Owner's Manual - Page 53

... your home reach your scheduled temperature at your schedule. No problem. The thermostat then turns on the heating or cooling at just the right time to 70°F by 6:00 AM. Each day it take the air conditioner to warm your heating and/or cooling system. How long does it adjusts the next day's recovery start time accordingly. 53...

Owner's Manual - Page 57

... month before the batteries run down completely. 2. The LO Battery indicator flashes in the display. Although the thermostat has a Low Battery indicator, replace the batteries once a year to prevent the thermostat and heating/ cooling system from shutting down due to prevent your home for more than a month to lack of battery power. 4. Replace the batteries...

Owner's Manual - Page 59

... is blank. Check that the temperature settings are installed as marked on the thermostat. Cooling system does • Set the system to 37°C). Then . . . Display is set below the room temperature and "Cool On" shows solidly in Step 11. Temperature settings Check that fresh AAA alkaline batteries are : do not change. • Heating 40°F to 90°...

Owner's Manual - Page 60

... make sure it is not shown in the display. pumps only). Troubleshooting Tips (Continued) If . . . Then . . . Wait up to five minutes for heat Control in Heating, and make sure the mode and warm air in the display. "Heat On" is active. "Cool On" is set the temperature setting below the room temperature. Check and make sure the bare portions...

Owner's Manual - Page 61

... shown in cool mode. working. 61 69-1725-1 the room temperature ("Heat On" is Check Installer Setup Number 0170, Heating running in display). Red LED is on in the A system monitor is set below or cooling system. and/or Cooling System Type, and make sure heat temperature the setting matches the installed heating and/ setting is wired to the thermostat L upper right...