Carrier 58MEC Furnace User Manual


 
17
Is LED status light on?
Is LED status light blinking rapidly
without a pause?
Is LED status light blinking ON/OFF slowly
with a combination of short and
l
ong flashes?
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 belo
w f
or the status code that
w
as 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 and
grounding. If units are twinned, check for proper
low-voltage (24V) transformer phasing.
To recall status code briefly remove and reconnect one RED wire from the
limit switch or flame rollout switch to display stored status code. On RED LED
control do not remove power or blower access panel before initiating status
code recall. You can also recall the previous status code by momentarily
shorting the TEST/TWIN terminal to Com24V terminal until the LED goes out.
LED will flash the status of the previous code or status code #11 (1 shor
t and
1 long flash) if there was no previous code. After the control repeats the code
4 times, the control will start the component test sequence. Once initiated
the control will tu
rn ON at HI HEAT speed. The inducer will run for the entire
component
test. The HSI, blower motor LO HEAT speed, H
I HEAT speed, and
COOL speed will r
un
for 10 – 15 seconds each. Gas valve and humidifier will
not be turned on. When the blower motor is turned OFF the inducer will be
switched to low-speed for 10 seconds.
Was there a previous status code
other
than #11?
Is door switch closed?
Is there 115V going to switch?
Replace door switch.
Replace tra
nsformer.
Does the control respond to
W/W1,
W2, Y1,
Y/Y2, and G (24V) thermostat signals?
Run system t
hrough a lo
w-heat, high-heat,
or cooling cycle to check operation. Status
codes are erased after 72 hours. On RED
LED
boards stored status codes can also be
erased whenever
(115V or 24V)
i
s interrupted.
Replace fur
nace control.
Close door switch and go back to START.
Is circuit breaker closed?
Check for continuity in wire from circuit
breaker to furnace.
Close circuit breaker and go back to START.
Check room thermostat or
interconnecting cable.
Is 24V present at
W/W1,
W2, Y1, Y/Y2 or G
thermostat term
inals on the furnace
control?
Disconnect all the thermostat wires from
the
furnace control.
Does the problem repeat when using a
jumper wire?
The thermostat is not compatib
le with the
furnace control. Either install a
ballast
r
esistor,
connect the Com24V thermostat terminal to
the ther
mostat, or replace the ther
mostat.
NO
YES
YES
NO
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
YES
NO
NO
NO
YES
YES
NO
NO
START
NO
TROUBLESHOOTING GUIDE — TWO-STAGE
A05111
A05095
58MEC