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58SU0A (Series 2 & 3): Troubleshooting Guide
Rapid Flashing LED
Indicates that line voltage polarity is reversed.
STEP
1.
Is this furnace twinned with another furnace?
2.
Remove blower access panel and depress door switch. Use a piece of tape to hold switch closed.
3.
Is 115-VAC across NEUTRAL-L2 and chassis ground?
4.
Line voltage polarity is reversed. Fix problem.
5.
Go to page number indicated in Index for CLEANUP AND START- UP INSTRUCTIONS.
6.
Replace the furnace control.
Remove blower access panels and depress door switch in each unit. Use tape to hold switches
7.
closed.
8.
Is the AMBER LED status light blinking rapidly in only one of the twinned units?
9.
Are the fuses, breakers, or manual disconnect on the problem unit correctly set?
10.
Fix problem.
11.
Are the Auxiliary Limit switches properly set?
12.
Do you have 115-VAC across L1 and NEUTRAL-L2 in the problem unit?
13.
Do you have 24-VAC across SEC-1 and SEC-2 in the problem unit?
14.
Replace the transformer.
Turn power off to both units. Check continuity of power leads and door switch in the problem unit. If
15.
necessary, repair power leads and/or replace door switch in the problem unit.
Check the furnace circuit breaker location in the service panel. On single-phase (residential)
systems, each furnace circuit breaker should be located directly across from each other in service
panel, or each furnace circuit breaker should be located on the same side of service panel but must
16.
skip 1 space to be connected to the same leg of the 1-phase power supply. On 3-phase
(commercial) systems, each furnace circuit breaker should be located directly across from each
other in service panel, or each furnace circuit breaker should be located on the same side of service
panel but must skip 2 spaces to be connected to the same leg of the 3-phase power supply.
Check the 115-VAC power lead connections at the furnace control of each furnace. The BLACK
17.
lead goes to L1 and the WHITE lead goes to NEUTRAL-L2.
Depress and use a piece of tape to hold door switch closed on both units. Turn power on to both
18.
units
19.
Do you have 0-VAC shown when measuring from L1 on one unit to L1 of the second unit?
Check the 115-VAC transformer lead connections at the furnace control of each furnace. The
20.
BLACK lead goes to L1 and the WHITE lead goes to NEUTRAL-L2.
If the circuit breaker location and the 115-VAC wiring is correct, reverse the transformer secondary
21.
lead connections SEC-1 and SEC-2 in the MAIN furnace.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
ACTION
9
YES
NO
GO TO
7
2
3
4
6
5
INDEX
5
8
9
16
11
10
5
12
10
13
15
16
14
5
5
17
18
19
20
16
21
5
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