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58SU0A (Series 2 & 3): Troubleshooting Guide
COMBUSTION TONE MITIGATION
STEP
1.
Remove outer furnace door. Record status of AMBER LED. See Service/Status Code Instructions.
2.
Is the AMBER LED status light blinking ON/OFF slowly with a combination of short and long flashes?
Determine status code. The status code is a 2-digit number with the first digit determined by the number of
3.
short flashes and the second digit by the number of long flashes
4.
Go to page number indicated in the Index for the section covering the status code.
5.
Remove the blower access panel and disconnect the R thermostat lead from the furnace control
6.
Inspect burner box air inlet elbow for blockage
7.
Tighten burner box mounting screws (if loose) to 45 in-lbs.
8.
Check and tighten igniter and flame sense mounting screws as needed
9.
Check and tighten all inducer housing and inducer panel screws as needed
10.
Jumper R and W thermostat terminals and monitor for tone
11.
Does unit still exhibit tone during start up or operation?
12.
Go to the page number indicated in Index for the CLEANUP AND START-UP INSTRUCTIONS.
Clock input rate. Do NOT use manifold pressure method. Is the gas valve adjusted to achieve the proper
13.
input rate?
Adjust gas valve to achieve proper furnace input rate per Installation, Start-Up, and Operating instructions. If
14.
it cannot be adjusted to proper rate, replace gas valve
15.
Does unit still exhibit tone during start up or operation?
Measure manifold pressure. Adjust manifold pressure up by 0.1-in. w.c. if set below 2.3-in. w.c., and down
16.
0.1-in. w.c. if currently set at or above 2.3-in. w.c.
17.
Does unit still exhibit tone during start up or operation?
18.
Remove R to W jumper and allow unit to cool
Check for proper output of the transducer. To do this, connect a DC voltmeter across terminals PL12-2
19.
GREEN and PL12-3 BLACK (+).
20.
Do you have more than 0.65VDC?
21.
Replace Transducer
Connect 1 side of a slope manometer with a tee to the collector box pressure tap. Refer to pressure check
22.
connection illustration in APPENDIX C
23.
Jumper R and W thermostat terminals
Referencing the Voltage/Pressure graph located in APPENDIX D, compare the pressure from the slope
manometer to the output signal voltage from the transducer.
24.
EXAMPLE: The graph illustrates that at 1" of negative pressure, the transducer output should be
approximately 1.5 VDC. At 3" of negative pressure, the transducer output should be approximately 3.5 VDC.
25.
Is the transducer output within +/- 0.15 VDC of expected?
26.
Remove R to W jumper and allow unit to cool
Remove inducer assembly from choke plate. Remove choke plate and reseal plate to cell panel. Allow 10
27.
minutes to seal before re-installing inducer assembly.
28.
Inspect inducer gasket and replace if damaged
29.
Set thermostat to call for heat or jumper R and W thermostat terminals and monitor for tone
30.
Does unit still exhibit tone during start up or operation?
31.
Remove burner box assembly and inspect burner for debris or damage. Replace as needed
32.
Inspect the burner insulation/gasket for damage or debris. Replace as needed
33.
Install burner box assembly
34.
Set thermostat to call for heat or jumper R and W thermostat terminals and monitor for tone
35.
Does unit still exhibit tone during start up or operation?
36.
Contact Distributor Service Manager for unit replacement authorization
37.
Go to the page number indicated in Index for the CLEANUP AND START-UP INSTRUCTIONS.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
ACTION
22
YES
NO
GO TO
2
3
5
4
INDEX
6
7
8
9
10
11
13
12
INDEX
16
14
15
16
12
17
18
12
19
20
21
22
24
24
25
26
21
27
28
29
30
31
12
32
33
34
35
36
12
37
INDEX
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