Carrier 58MSA Service And Maintenance Instructions

Also see for 58MSA Series: Service and maintenance instructions User manual Instruction manual Installation, start-up, and operating instructions Installation, start-up, and operating instructions

Contents

Carrier 58MSA Service And Maintenance Instructions Manual pdf 14 page image

A02214aIs LED status light on?Is LED status light blinking rapidly without apause?Is LED status light blinking ON/OFF slowlywith a combination of short and long flashes?Determine status code. The status code is a2 digit number with the first digit determinedby the number of short flashes and the seconddigit by the number of long flashes?Go to section below for the status code thatwas flashed.Is there 115V at L1 and L2?Is there 24V at SEC-1 and SEC-2?Replace furnace control.Check for correct line voltage polarity. If unitsare twinned, check for proper low-voltage(24V) transformer phasing.To recall status code briefly remove and reconnect one RED wire from the LimitSwitch or Flame Rollout switch to display stored status code. On RED LEDcontrol do not remove power or blower access panel before initiating statuscode recall. Shorting the TEST/TWIN terminal to Com24V terminal until theLED goes out will flash status code #11 (1 short and 1 long flash). After thecontrol repeats the code 4 times, the control will go through a brief componenttest sequence. The inducer will start and run for the entire component test.The HSI, blower motor HEAT speed, and COOL speed will run for 10 – 15seconds each. Gas valve and humidifier will not be turned on.Was there a previous status codeother than #11?Is door switch closed?Is there 115V going to switch?Replace door switch.Replace transformer.Does the control respond to W, Y1 (if present),Y/Y2, and G (24V) thermostat signals?Run system through a heating or cooling cycleto check operation. Status codes are erasedafter 72 hours. On RED LED boards storedstatus codes can also be erased whenever(115V or 24V) is interrupted.Replace furnace control.Close door switch and go back to START.Is circuit breaker closed?Check for continuity in wire from circuit breakerto furnace.Close circuit breaker and go back to START.Check room thermostat orinterconnecting cable.Is 24V present at W, Y1 (if present), Y/Y2 orG thermostat terminals on the furnace control?Disconnect all the thermostat wires from thefurnace control.Does the problem repeat when usinga jumper wire?The thermostat is not compatible with thefurnace control. Either install a ballast resistor,connect the Com24V thermostat terminal tothe thermostat, or replace the thermostat.NOYESYESNONOYESYESYESYESNOYESYESNOYESNOYESNONONOYESNOYESNOSTART TROUBLESHOOTING GUIDENO14

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