Troubleshooting Guide - Carrier INDUCED COMBUSTION 58YAV Service And Maintenance Instructions

START
NO
Is red LED status light on?
YES
Is red LED status light blinking
YES
rapidly without a pause?
NO
Is red LED status light blinking
ON/OFF slowly with a NO
combination of short and long
flashes?
YES
Determine status code. The
status code is a 2 digit number
with the first digit determined by
the number of short flashes and
the second digit by the number of
long flashes.
Go to section with status code
determined.

Troubleshooting Guide

NO
Is there 115v at L1 and L2?
YES
NO
Is there 24v at SEC-1 and SEC-2?
YES
Replace control center.
Check for correct line voltage
polarity. If units are twinned,
check for proper low-voltage
(24v) transformer phasing.
Check for previous fault by
momentarily shorting the TEST
terminal and the C terminal until
the LED goes out. LED will flash
the status code of any previous
fault or the code No. 11 (1 short
and 1 long flash) if no previous
fault. After the control repeats the
code 3 times, the control will go
through a brief component test
sequence. The inducer will start
and run for the entire component
test. The HSI, blower motor heat
speed, and blower motor cool
speed will run for 10-15 sec each.
Was there a previous fault code NO
other than No. 11?
YES
NO
Is door switch closed?
YES
NO
Is there 115v going to switch?
YES
Replace door switch.
Replace transformer.
Does control respond to W, Y, NO
or G 24-vac thermostat signals?
YES
Run system through a heating or
cooling cycle to check operation.
Status codes are erased after 48
hrs or whenever power (115v
or 24v) is interrupted.
Close door switch and go to start.
NO
Is circuit breaker closed?
YES
Close circuit breaker and
go back to start.
Check for continuity in wire from circuit
breaker to furnace.
Check room thermostat or
interconnecting cable.
NO
Is 24 vac present at W, Y, or G
terminals on the control?
YES
Replace control if it does not
respond to 24-vac signal at W, Y,
or G screw terminals.
A99123a