Carrier 59CU5A Installation, Start-up, Operating And Service And Maintenance Instructions

59CU5A: Installation, Start-up, Operating and Service and Maintenance InstructionsManufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.64A190174Fig. 75 – Troubleshooting GuideIs AMBER LED status light on?Is there 24V at SEC-1 and SEC-2?Is there 115V at L1 and L2?Replace furnace control.Replace transformer.Replace door switch.Is there 115V going to switch?Is door switch closed?Is circuit breaker closed?Check for continuity in wire from circuitbreaker to furnace.Close circuit breaker and go back toSTART.Is AMBER LED status light blinkingrapidly without a pause?Check for correct line voltage polarity. Ifunits are twinned, check for proper low-voltage (24V) transformer phasing. Verifyunit is properly grounded.Is AMBER LED status light blinkingON/OFF slowly with a combination ofDetermine status code. The status codedetermined by the number of shortTo recall previous status codes disconnect the Rthermostat connection, reset power, and put setupswitch SW1-1 in the ON position. The AMBER LEDare erased after 72 hours or can be manually erasedby putting setup switch SW1-1 in the ON positionand jumpering R, W/W1, and Y/Y2 simultaneouslysetup switch SW1-1 in the OFF position.Was there a previous status code otherthan #11?Go to section below for the status code Does the control respond to W/W1, W2,Y1, Y/Y2, and G (24V) thermostatsignals?Run system through a low-heat, high-heat, or cooling cycle to check operation.Status codes are erased after 72 hoursor can be manually erased by puttingsetup switch SW1-1 in the ON positionand jumpering R, W/W1, and Y/Y2simultaneously until status code #11 isIs 24V present at W/W1, W2, Y1, Y/Y2 orG thermostat terminals on the furnacecontrol?Check room thermostat orinterconnecting cable.Disconnect all the thermostat wires fromthe furnace control.Does the problem repeat when using ajumper wire?Replace furnace control.The thermostat is not compatible with thefurnace control. Either install a ballastresistor, connect the Com24V thermostatterminal to the thermostat, or replace thethermostat.YESNOYESYESYESYESYESYESSTARTYESYESNONONOO ON NNOO ON NNONONOClose the door switch.YESYES YES