Honeywell CT3400 Owner's Manual - Page 18

Heating does not come on. Cooling does not come on. s Check that switch on thermostat is set to HEAT. s Check the system fuse or circuit breaker and replace or reset if necessary. If display is blank or displays REPL BAT, install fresh batteries. s Check for correct wiring and good connections. s Jumper wires R and W. If heat does not come on, contact your heating dealer. s If temperature setting is higher than current temperature, and HEAT ON is displayed, contact Honeywell Customer Assistance at 1-800-468-1502. s Check that switch on thermostat is set to COOL. s Check the system fuse or circuit breaker and replace or reset if necessary. If display is blank or displays REPL BAT, install fresh batteries. s Check for correct wiring and good connections. 31 69-0733-3 The house is too warm or too cool. s Jumper wires Rc and Y. If cooling does not come on, contact your cooling dealer. s The thermostat has a built-in time delay on cooling. Allow up to ten minutes after changing the setting before the air conditioner starts. s Make sure outdoor disconnect is energized (on). s If temperature setting is lower than current temperature, and COOL is displayed, move system switch from COOL to OFF for ten minutes. After ten minutes, return the switch to the COOL position. If your air conditioner comes on, this indicates your compressor may have reached its high limit temperature protection and shut down. If your air conditioner does not come on after ten minutes and COOL is displayed, contact Honeywell Customer Assistance at 1-800-468-1502. s If 2- or 4-wire installation, verify that R-Rc jumper is installed. s Press CURRENT SETTING to check the current temperature setting. s If desired, change the temperature setting. See page 15. 32 69-0733-3