RTH3100C Table of contents About your new thermostat Appendices Thermostat features........2 Battery replacement........9 Quick reference to controls....... 3 In case of difficulty........10 Quick reference to display......4 Customer assistance....... 12 Accessories..........12 Thermostat Operation 1-year limited warranty......13 System switch (Heat/Cool)......
Operating M anual About your new thermostat C o n g ra tu la tio n s on th e p u rc h a s e o f y o u r n e w H o n e y w e ll th e rm o s ta t. It h a s b ee n d e s ig n e d to g iv e y o u m a n y y e a rs o f re lia b le s e rv ic e a n d e a s y -to -u s e , p u s h -b u tto n c lim a te c o n tro l.
RTH3100C Quick reference to controls Tem perature adjustm ent P re s s to a d ju s t te m p e ra tu re s e ttin g s . System switch (s e e p a g e 5) Cool: •...
Operating M anual Quick reference to display screen Current inside temperature Temperature setting If flashing, compressor Low battery warning protection is engaged (see page 8). • System Status • Cool On: Cooling system is on. • Heat On: Heating system is on. •...
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RTH3100C T h e SYSTEM s w itc h c a n b e s e t to c o n tro l y o u r h e a tin g o r c o o lin g s y s te m , d e p e n d in g on th e s e a s o n .
Operating M anual Fan switch S e t th e FAN s w itc h to A u to o r O n . In “A u to ” m o d e (th e m o s t c o m m o n ly u se d s e ttin g ), th e fan ru n s o n ly w h e n th e h e a t...
RTH3100C Temperature controls P re s s th e te m p e r a tu re a d ju s tm e n t b u tto n s until th e te m p e r a tu re y o u w a n t is d is p la y e d in th e u p p e r rig h t p o rtio n o f th e s c re e n .
Operating M anual Built-in compressor protection T h is fe a tu re h e lp s p re v e n t d a m a g e to th e c o m p re s s o r in y o u r a ir c o n d itio n in g o r h e a t p u m p s y s te m .
Operating M anual In case of difficulty If y o u h a v e d iffic u lty w ith y o u r th e rm o s ta t, p le a s e try th e fo llo w in g s u g g e s tio n s . M o s t p ro b le m s c a n b e c o rre c te d q u ic k ly a n d easily.
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RTH3100C In case of difficulty Temperature Make sure heating and cooling temperatures are set to acceptable ranges: settings do not • Heat: 40° to 90°F (4.5° to 32°C). change • Cool: 50° to 99°F (10° to 37°C). “Cool On” or Compressor protection feature is engaged.
F o r a s s is ta n c e w ith th is p ro d u c t, p le a s e v is it http://yourhom e.honeywell.com . O r c a ll H o n e y w e ll C u s to m e r C a re to ll-fre e a t 1 - 8 0 0 - 4 6 8 - 1 5 0 2 .
This warranty does not cover removal or reinstallation costs. This warranty shall not apply if it is shown by Honeywell that the defect or malfunction was caused by damage which occurred while the product was in the possession of a consumer.