Pepco Web-Programmable Thermostat Homeowner's Manual page 20

Troubleshooting
No Heat
Possible Cause
Pilot light not lit.
System switch not set to HEAT.
Furnace Lock-Out Condition. Heat may also be
intermittent.
Heating system requires service or thermostat requires
replacement.
Furnace or Air Conditioner Cycles Too Fast or Too Slow (Narrow or Wide Temperature Swing)
Possible Cause
The location of the thermostat and/or the size of the
heating system may be influencing the cycle rate.
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If it will not stay lit, call for service from your HVAC
contractor.
Press the thermostat's SYSTEM button one or
more times to select HEAT and press
temperature setpoint above room temperature.
Many furnaces have safety devices that shut down
when a lock-out condition occurs. If the heat works
intermittently, contact the furnace manufacturer or your
HVAC contractor for assistance.
To diagnose this condition:
Press SYSTEM button to select HEAT and press
to raise the temperature setpoint above room
temperature. Within a few seconds the thermostat
should make a soft click sound. This sound usually
indicates the thermostat is operating properly. If the
thermostat does not click after being reset, contact
Pepco Energy Wise Rewards for a replacement
thermostat. If the thermostat does click, contact the
furnace manufacturer or your HVAC contractor for a
service visit to verify the heating is operating correctly.
Electronic thermostats, like this one, normally
provide precise temperature control and may cycle
faster than some older mechanical models. A faster
cycle rate means the unit turns on and off more
frequently to maintain the desired temperature, but
runs for a shorter time so there is no increase in overall
energy use.
Pepco Web-Programmable Thermostat Homeowner's Manual
Corrective Action
to raise the
Corrective Action