Carrier 33CS Troubleshooting, Thermostat Error Code Descriptions, Error Codedescription

means,forexample,thatif theunoccperiodtemperatureset- tingislowerthantheperiodthatprecedesit,thenthethermo-

statwillstartcoolingdownthe space before the beginning of the scheduled unocc period. The thermostat does this at an en- ergy efficient rate. This not only helps make the space as com- fortable as possible, it also makes thermostat usage more cost effective.

Power Outage --Ifthe building loses electricity, the thermostat will not need to be reprogralmned. The settings are retained in memory.

TROUBLESHOOTING

There are system error messages that may appear on the thermostat screen. See Table 4 for a list the possible system er- ror messages and what they mean.

Table 4 --Thermostat Error Code Descriptions

ERROR

CODEDESCRIPTION

The system is not communicating properly, Call the

E1 local Carrier representative for service

The temperature sensor has failed, Call the local

E3 Carrier representative for service

There is an internal memory failure, Call the local

E4 Carrier representative for service

The humidity sensor is not working, Call the local

E5 Carrier representative for service