Delmarva Power Web-Programmable Thermostat Homeowner’s Manual 19
DDWTMS1317B—Delmarva Power IT900 Thermostat Manual
(Version 2 Thermostat with New Screen Shots)
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DDWTMS1317B
Delmarva Power IT900 Thermostat Manual (Version 2 Thermostat with New Screen Shots)
Job Opened: November 1, 2013
Requested In-Home Date: December 1, 2013
Latest Revision: November 5, 2013
Approved: December 4, 2013
Troubleshooting
No Heat or No Cool
Possible Cause Corrective Action
Thermostat may be in an Energy Wise Rewards
conservation period. “Event in Progress” will be
displayed on top line of home screen.
Wait for the Energy Wise Rewards conservation period
to end.
System switch is set to OFF. Press the thermostat’s SYSTEM button one or more
times to select HEAT or COOL (as appropriate).
Heat, Cool, or Fan Runs Constantly
Possible Cause Corrective Action
Fan set to ON. Change Fan to AUTO.
Common Problems: No Heat, No Cool, or No Fan
Possible Cause Corrective Action
Blown fuse or tripped circuit breaker. Replace fuse or reset breaker.
Furnace power switch set to OFF. Turn switch to ON.
Furnace blower compartment door or panel is loose or
not properly installed.
Replace door panel in proper position to engage safety
interlock or door switch.
Thermostat Setting and Thermometer Disagree
Possible Cause Corrective Action
Thermostat thermometer setting requires adjustment. The thermometer can be adjusted
+
/
–
5 degrees.
See Adjust Temperature Display on page 9.
13_DDWTMS1317B_IT900_v2_TSTAT_MANUAL-CFO-120413.indd 19 12/4/13 9:42 AM
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