Carrier 070-08/024070 Installation, Start-Up, Operating And Service And Maintenance Instructions page 51

START
L Is LED status light on?
YES
Fig. 60--Troubleshooting Guide
'_'-'_ Is there 115V at L1 and L2?
_ YES
I Is there 24V at SEC-1 and SEC-2?
II YES
I Replace furnace control.
Is LED status light blinking rapidly without a
pause?
,I,N°
Is LED status light blinking ON/OFF slowly NO
with a combination of short and long flashes?
,_YES
Determine status code. The status code is a
2 digit number with the first digit determined
digit by the number of long flashes?
by the number of short flashes and the second
boow o.h , , .... 1
_--_ Is door switch closed?
_l YES
I Is there 115V going to switch?
_l YES
Replace door switch.
_--_ Is door switch closed?
'_--_ Is circuit breaker closed? I_
'_l YES
J Check Dr continuity in wire from circuit breaker
o urnace.
Check for correct line voltage polarity. If units
are twinned, check for proper low-voltage
t
(24V) transformer phasing. 1
I
--_1 Replace transformer. I Close circuit breaker and go back to START t_
To recall status code briefly remove and reconnect one RED wire from the draft
safeguard 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 ouL LED will flash the status
cede 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 inducer will start and run
for the entire component test. The HSI, blower motor FAN speed (AMBER LED
boards only) HEAT speed, and COOL speed will run for 10 - 15 seconds each.
Gas vak, e and humidifier will not be turned on.
Was there a previous status code
other than #11 ?
I Check room thermostat or interconnecting cable.
t NO
I,_ Doesthecont o espond oW, Y1 (pesent), I NO _1 s24Vp esentatW, Y1 ( p esent),Y/Y2 o
Y/Y2, andG (24V) th ........ tat signals? _ Gth ........ tatterrninalsonthe f........... trol? I
YES _!' YES
Run system through a heating or ccoling cycle Disconnect all the thermostat wires from the
to check operation. Status codes are erased furnace control.
after 72 hours. On RED LED boards stored
(115V or 24V) is interrupted.
status codes can also be erased whenever /
I Replace f ........... tro]. _,_ D jo_rsl _heep [rOeb I...... peat wh ..... ing 1
, NO
The thermostat is not compatible with the |
furnace control. Either install a ballast resistor,
J
connect the Com24V thermostat terminal to
the thermostat, or replace the thermostat.
NO
A02106a
A02106a