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Honeywell RTH8500 Support Question

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Question posted by Katherinebui on January 13th, 2018

It Works Not Right

Hello,Can you please show me how I can fix the problem with my RTH8500 Honeywell?We used it a couple years already, it works very well. The problem just happened a couple days ago. Even I set up the heating the same as " EnergyStar setting for maximum cost savings " as in the operating Manual book . But I seems wrong . The temperature inside is higher ( 80 ) than the temperature I set up (70) . Because it's too hot , I turn off heating ( our system is at OFF ) , but the temperature inside still 79 even the weather outside is minus-10oC . It's weird! Please tell me what I need to do now ?

Current Answers

Answer #1: Posted by BusterDoogen on January 13th, 2018 12:52 PM
This answer was accepted by the poster of the original question.
BusterDoogen

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If you have access to another thermometer use it to get a reference. If the thermostat doesn't read the same temp then it most likely has a component failure.

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Related Honeywell RTH8500 Manual Pages

Owner's Manual - Page 1

Operating Manual RTH8500 Touchscreen Programmable Thermostat 69-1901EF-1
Owner's Manual - Page 2

Registered Trademark. Copyright © 2007 Honeywell International Inc. All rights reserved. This thermostat contains a Lithium battery which may apply, See www...touchscreen keys. BE CAREFUL! Never use sharp instruments, such as a pencil or pen, to the thermostat, always press keys with this product please visit http://yourhome.honeywell.com or call Honeywell Customer Care toll-free at 1-...
Owner's Manual - Page 3

Table of contents RTH8500 About your new thermostat Thermostat features 2 Programming at a glance 3 Quick reference to controls 4 Quick reference to status display......... 5 Programming & Operation Clock setting 6 Fan setting 7 System setting 8 Using program schedules 9 Program schedule overrides 12 Vacation hold 14 Special features 15 Screen cleaning 16 Furnace filter reminder 17...
Owner's Manual - Page 4

... designed to read-even in the dark.  Features • 7-day program schedules maximize comfort and economy. • Armchair programming: Just pull thermostat from the wall to set schedules. • EnergyStar® compliant to greatly reduce your new thermostat Congratulations! Operating Manual About your heating/cooling expenses. • One-touch temp control overrides program schedule...
Owner's Manual - Page 5

RTH8500 Your new thermostat is set the time and day. All you wake at 6 am, leave at 8 am, return at 6 pm and go to bed at 10 pm To change, see pages 10-13 ONE-TOUCH TEMP CONTROL: You can override the program schedule at work or asleep (assumes you have to do is pre-programmed...
Owner's Manual - Page 6

... schedule (see page 11) MON TUE WED THU FRI SAT SUN OK TO PICK MULTIPLE DAYS 70 FAN Inside AUTO 70 Set To SYSTEM HEAT 6:01 AM Following Schedule SCHED HOLD CLOCK SCREEN MORE Press to adjust temperature settings (see pages 11-14) Press for more options (select models only) Press to override program...
Owner's Manual - Page 7

Quick reference to status display Current inside temperature Current day of week RTH8500 Temperature setting Fan setting System setting Current time WED 70 FAN Inside AUTO SYSTEM HEAT 6:01 AM 70 Set To Following Schedule Recovery Program schedule on (does not display when off) SCHED HOLD CLOCK SCREEN MORE Smart Response® Technology in effect (see page ...
Owner's Manual - Page 9

Fan setting WED 70 FAN Inside AUTO SYSTEM HEAT 6:01 AM 70 Set To Following Schedule SCHED HOLD CLOCK SCREEN MORE Press FAN RTH8500 Press FAN to select fan operation, then press DONE. • On: Fan is always on. • Auto: Fan runs only when the heating or cooling system is on. 
Owner's Manual - Page 10

..., then press DONE. • Heat: Thermostat controls only the heating system. • Cool: Thermostat controls only the cooling system. • Auto: Thermostat automatically selects heating or cooling depending on how your thermostat was installed. Compressor is locked out.  Operating Manual System setting WED 70 FAN Inside AUTO SYSTEM HEAT 6:01 AM 70 Set To Following Schedule SCHED...
Owner's Manual - Page 11

... schedules RTH8500 It's easy to program your system for weekdays and weekends. Set to the time you go to bed and the temperature you want overnight (usually an energy-saving level).  You can program four time periods each day, with different settings for maximum energy savings. Set to the time you return home and the...
Owner's Manual - Page 12

... much as 33%. (See next page to use EnergyStar® program settings. Operating Manual EnergyStar® settings for maximum cost savings This thermostat is pre-set to adjust times and temperatures of each time period.) Wake (6:00 am) Leave (8:00 am) Return (6:00 pm) Sleep (10:00 pm) Heat (Mon-Fri) 70 ° 62 ° 70...
Owner's Manual - Page 13

DONE WAKE LEAVE RETURN SLEEP CANCEL Set time for selected day(s). 4. 70 FAN Inside AUTO 70 Set To To adjuWsEDt program Following Schedule schedules RTH8500 67:000 FAN Inside AM PrAeUTsOs SCHED 70 Set To SCHED HOLD CLOCK SCREFESNoclhloewdMuiOnleRgE 6:00 Press EDIT AM DONE EDIT WAKE LEAVE RETURN SLEEP CANCEL Select day(s) Set heat/cool levels MON TUE WED...
Owner's Manual - Page 15

... be maintained 24 hours a day until you manually change it or press CANCEL (or SCHED) to resume program schedule 13 Whatever temperature you set will turn off the program schedule. Program schedule override (permanent) RTH8500 Press HOLD Adjust temperature WED 70 FAN Inside AUTO SYSTEM 73 Set To Heat On HEAT 8:00 AM Permanent Hold SCHED...
Owner's Manual - Page 17

... heating are used on screen. For example: Set the Wake time to 6 am , so the temperature is 70° by the time you set to Auto, the thermostat automatically selects heating or cooling depending on before 6 am , and the temperature to 70°. During the wait time, the message "Wait" is displayed on the same day. The thermostat...
Owner's Manual - Page 18

... Note: Do not spray any settings. The screen will remain locked for cleaning. Spray liquids onto a cloth, then use the damp cloth to resume normal operation, or press SCREEN again if you can clean the screen without changing any liquid directly on the thermostat. Avoid abrasive cleansers. 16 Use water or household glass cleaner...
Owner's Manual - Page 19

... after changing the filter, to replace your filter. FAN AUTO CHANGE FILTER 70 Inside 55 Set To SYSTEM RESET HEAT 6:00 PM SCHED HOLD CLOCK SCREEN MORE Press MORE to change the reminder interval: 1. Filter 60 Days RTH8500 If activated during installation, the furnace filter reminder alerts you when it is time to restart...
Owner's Manual - Page 20

... LO BATT warning begins flashing. The warning flashes about 30 days before leaving home for more than a month. Even if the warning does not appear, you should replace batteries once a year, or before batteries are optional (to provide backup power) if your thermostat was wired to run on AC power when installed. Insert...
Owner's Manual - Page 21

... Display is blank • Check circuit breaker and reset if necessary. • Make sure power switch at heating & cooling system is on lower • This button will remain blank unless the furnace filter change right of difficulty RTH8500 If you have difficulty with your Installation Guide). Most problems can be corrected quickly and easily.
Owner's Manual - Page 23

... you specific legal rights, and you . In Canada, write Retail Products ON15-02H, Honeywell Limited/Honeywell Limitée, 35...product was in the workmanship or materials, under normal use and service, for a period of a consumer....year limited warranty RTH8500 Honeywell warrants this warranty, please write Honeywell Customer Relations, 1985 Douglas Dr, Golden Valley, MN 55422 or call Honeywell...
Owner's Manual - Page 25

Mode d'emploi RTH8500 Thermostat programmable à écran tactile 69-1901EF-1

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