Carrier 58TMA - Manual (Page 7)

replacement is required, use ONLY a 3-amp fuse. The control will
display code 24 when the fuse needs replacement.
The control in this furnace is equipped with an LED status light to
aid in installation, servicing, and troubleshooting. It can be viewed
through the sight glass or window on the blower access door. The
control indicates status with the LED on continuously, rapid
flashing, or a code composed of 2 digits. (The first digit is the
number of short flashes, the second is the number of longs flashes.)
Refer to the service label on the blower compartment door for code
explanations and useful troubleshooting suggestions. (See Fig. 13.)
It is important to note that the power to the furnace must not be
interrupted and the furnace blower door must not be removed until
the LED status code(es) is recorded. When power to the control is
interrupted, the status memory is erased.
The control will store up to 5 previous codes but will not store
non-current code longer than 48 hr. To retrieve previous codes, if
present, no thermostat inputs to the control must be present and all
time delays must expire. Remove 1 of the red main limit wires 1
to 4 sec until the LED light goes out, then reconnect it. (See Fig.
6 and 7.) (Do not leave red wire disconnected for longer periods of
time as the control will assume an overtemperature condition exits
and will respond with indoor blower operation.) This places the
control in the status recall mode and displays the first code stored
in memory. Record the code and repeat the disconnect and
reconnect of the red wire, recording each code until code 11 is
displayed indicating no additional faults. After the last code is
displayed or after 2 minutes in the code, recall mode the control
will return to normal standby mode.
Use any recorded fault codes, the service label, and the trouble-
shooting diagram on the following pages to diagnose and correct
any problem condition.
TROUBLESHOOTING
Refer to the service label. (See Fig. 13.) Page 10 contains a
troubleshooting guide. This guide can be a useful tool in isolating
furnace operation problems. Beginning with the word "Start,"
answer each question and follow the appropriate arrow to the next
item.
The guide will help to identify the problem or failed component.
After replacing any component, verify correct operation sequence.
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