Honeywell RTH221B Support Question
Honeywell RTH221B Support Question
Find answers below for this question about Honeywell RTH221B.Need a Honeywell RTH221B manual? We have 1 online manual for this item!
Question posted by cherylhutchinson on September 29th, 2013
Model Rth221
Set the time and then after about 1 hour time resets to 12:00 and starts flashing. This only started happening and the unit is only 9 months old
Current Answers
Related Honeywell RTH221B Manual Pages
Owner's Manual - Page 1
... start time and its settings when the time display flashes.
If the thermostat is following modes. • Cool: System is in Cooling mode. • Off: System is off. • Heat: System is below 50 °F (10 °C). RTH221
RTH221
User Guide
Programmable Thermostat
1.5 Fan switch
Use the Fan switch to place the system in one of the following the...
Owner's Manual - Page 2
...the consumer.
The word Hold will disappear and the thermostat will flash. RTH221
In case of five minutes).
screen. ...set if the thermostat was in Heat.
Press the or button to 37 °C). The start time...settings cannot be skipped.
Repeat steps 2 through 6 for more than a month.
Honeywell's sole responsibility shall be used until...
Owner's Manual - Page 8
RTH221
Printed in USA
08/2011
8/8
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