Carrier 59SC2A - Page 80

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59SC2A
Troubleshooting Guide
START
NO NO NO
is LED status light on? foment Is there 115V atL1 and L2? Foon is door switch closed? is door switch closed?
YES YES YES
Vv NO v. NO
is there 24V at SEC-1 and SEC-2? is there 115V going to switch? is circuit breaker closed?
YES YES YES
Replace furnace control. Replace door switch. Check for continuity in wire from circuit
breaker to furnace.
= YES
: as : : Check for correct line voltage polarity. If we
e
pause?
Haht
blinking
rapidly
without
Be}
units
are
twinned,
check
for
proper
low-
Replace
transformer.
ose
crreult
breaker
and
go
back
to
: voltage (24V} transformer phasing. :
NO
v
is LED status light blinking ON/OFF NO To recall status code briefly remove and reconnect one RED wire from the
slowly with a combination of short and | draft safeguard switch to display stored status code. You can also recall
long flashes? “| the previous status code by momentarily shorting the TEST/TWIN
terminal to Com24¥V terminal until the LED goes out. LED will flash the
YES status code of the previous fault or status code #11 (1 short and 1 long
flash) if there was no previous fault. After the control repeats the code 4
¥ times, the control will go through a brief component test sequence. The
Determine status code. The status code inducer will start and run for the entire component test. The HS!, blower
is a 2 digit number with the first digit motor FAN speed (when equipped) HEAT speed, and COOL
determined by the number of short speed will run for 10 - 15 seconds each. Gas valve and humidifier will not Check room thermostat or
flashes and the second digit by the be turned on. interconnecting cable.
number of long flashes?
A
No
= YES ¥. NO NO
Go to section below for the status code a Was there a previous status code other me Does the control respond to W, ¥1 (if - is 24V presental W, ¥4 (if present), Y¥2
that was flashed << than #112 3 present), Y/Y2, and G (24V) thermostat | or G thermostat terminals on the furnace
: . signals? control?
YES YES
¥
Run system through a heating or cooling v
cycle to check operation. Status codes
are erased after 72 hours. Disconnect all the thermostat wires from
the furnace control.
Vv.
YES
Replace furnace control.
Does the problem repeat when using a
jumper wire?
NO
Vv
The thermostat is not compatible with the
furnace control. Either install a ballast
resistor, connect the Com24V thermostat
terminal to the thermostat, or replace the
thermostat.