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58SU0A (Series 2 & 3): Troubleshooting Guide
MODEL NUMBER NOMENCLATURE
1, 2
3
Gas Furnace
Heating Stages
59
M
|
|
58 = 80%
Non-Condensing
59 = 90%+
M = Modulating
Condensing
T = Two Stage
S = Single Stage
C = Single Stage
Communicating
INSTRUCTIONS
This guide uses your expertise and observations to lead you to the
trouble spot as efficiently as possible. This is only intended as a guide
and should not be used blindly. Your experience and expertise are of
high value when troubleshooting this unit. Do not disregard your
instincts.
The furnace control was designed with diagnostic capabilities built in.
An AMBER LED is used to flash a status code which will lead you to
one of the sections as listed in the Index.
You should ALWAYS begin in the START HERE section (see Index for
page number) which will guide you to the appropriate section where a
minimal number of steps will be used to correct the problem. Once in a
EXAMPLE
Start Here Section
STEP
Step 1 tells us to remove main furnace door first and NOT TO REMOVE THE BLOWER ACCESS
1.
PANEL. It then asks the question, "Is AMBER LED status light on?". If the Limit switch was defective,
a limit circuit lockout status code would be flashing, so the answer is YES. We go to Step 2.
Step 2 asks the question, "Is the AMBER LED status light blinking rapidly without a pause?". If the
2.
limit switch was defective a limit circuit lockout status code would be flashing, so the answer is NO.
We go to Step 4.
Step 4 asks the question, "Is the AMBER LED status light blinking ON/OFF slowly with a combination
3.
of short and long flashes?". If the limit switch was defective, a limit circuit lockout status code would
be flashing, so the answer is YES. We go to Step 5.
Step 5 tells us to determine the status code. The status code is a 2-digit number with the first digit
4.
determined by the number of short flashes and the second digit by the number of long flashes. We
count the short and long flashes and see that status code 13 is flashing and go to Step 6.
5.
Step 6 tells us to go to status code 13 section
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
6
4
5
Major
Tier
Min. AFUE/NOx
Series
N
7
B
|
|
|
0 = 80%
1 = 80% Low NOx
B = Base
C = Comfort
(Not Ultra Low
NOx)
E = Export
2 = 92%
N = Infinity
5 = 95%
P = Performance
A
U = Ultra Low
6 = 96%
B
Nox
7 = 97%
8 = 98%
C
---
ACTION
7, 8, 9
10
Heating Input
Motor Type
060
E
|
|
C = Constant Airflow
Variable- Speed
(VCA) ECM
V = Variable-Speed
026 = 26,000 BTU
(VCT) PWM
040 = 40,000 BTU
M = Multi 18-Speed
060 = 60,000 BTU
Constant Torque
---
(MCT) ECM
155 = 155,000 BTU
section, read the ACTION. An ACTION may have a number in the GO
TO column. Do whatever the ACTION says, then proceed to the step
indicated in the GO TO column.
If the ACTION is a question (a question will have a number in the YES
or NO column), answer YES or NO. If the answer is YES, go to the step
indicated in the YES column. If the answer is NO, go to the step
indicated in the NO column.
Let's try our guide out using the EXAMPLE section below and see how
it works. Suppose that the problem is a defective Limit Switch (for
example the contacts will not re-close). This is an internal problem and
cannot simply be seen. We go to the START HERE section to Step 1.
3
13
11, 12
Voltage
14
Width
(1-phase)
Minor Series
17
1
1
|
|
|
1
2
3
14 - 14.2"
1 = 110V/60Hz
---
17 - 17.5"
2 = 230V/50Hz
21 - 21.0"
24 - 24.5"
YES
NO
2
19
3
4
5
7
15, 16
Airflow
16
|
08 = 800 CFM
10 = 1000 CFM
12 =1200 CFM
14 = 1400 CFM
16 = 1600 CFM
20 = 2000 CFM
22 = 2200 CFM
A220581
GO TO
6
INDEX
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