58SU0A (Series 2 & 3): Troubleshooting Guide
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
13
Status Code 14 - Ignition Lockout
This status code indicates the furnace failed to ignite gas and/or prove flame in 4 attempts. The variable speed furnace control will auto-reset in 3 hours. Refer
to status code 34.
Status Code 21 - Gas Heating Lockout
This status code indicates the main gas valve relay MGVR on the furnace control is stuck closed or there is a miswire/short to gas valve wiring. The furnace
control will NOT auto-reset.
93. Remove Inducer assembly 94
94. Inspect inducer gasket and replace if damaged 95
95. Inspect inducer wheel for debris and clean as needed 96
96. Inspect Inducer choke plate to cell panel connection and reseal as needed 97
97. Reinstall inducer assembly 98
98.
Turn power on and jumper the R and W thermostat terminals. Allow furnace to operate for 20 minutes or
until status code starts flashing
99
99. Does Burner thermal switch (BTS) trip again? 100 11
100.
You have inadequate combustion-air supply. This may be caused by furnace installed in a negative
pressure area.
10
101. You have an open RED wire or bad terminal in limit circuit. Repair wire or replace harness. 10
STEP ACTION YES NO GO TO
STEP ACTION YES NO GO TO
1.
IGNITION LOCKOUT - This status code indicates the furnace failed to ignite gas and/or prove flame
in 4 attempts. The furnace control will auto-reset in 3 hours. Refer to status code 34.
INDEX
STEP ACTION YES NO GO TO
1.
Turn power off, remove inner blower door and disconnect the R thermostat lead from the furnace
control board.
2
2. Use a piece of tape to hold door switch closed and turn power back on 3
3. Does status code 21 flash? 4 17
4. Turn power off and disconnect wiring to gas valve. 5
5. Turn power on 6
6. Does status code 21 flash? 7 10
7. There is a mis-wire or short in gas valve wiring. 8
8. Fix problem 9
9. Go to page number indicated in Index for CLEANUP AND START- UP INSTRUCTIONS. INDEX
10. Does a different status code flash? 20 11
11. Jumper R and W thermostat terminals. 12
12. Does status code 34 flash? 13 17
13. Turn power off and reconnect wiring to gas valve. 14
14. Turn power on. 15
15. Does status code 21 flash? 16 17
16. Replace gas valve 8
17. Does a different status code flash? 20 18
18. Turn power off and reconnect wiring to gas valve. 19
19. Turn power on. 21
20. Go to page number indicated in the Index for the section covering the status code. INDEX
21. Jumper R and W thermostat terminals. 22
22. Cycle the furnace several times to check for intermittent operation. 23
23. Does status code 21 ever flash? 24 25
24. Replace furnace control 8
25.
Go to page number indicated in Index for CLEANUP AND START-UP INSTRUCTIONS. If the
problem persists on an intermittent basis, replace the furnace control. If the problem persists on an
intermittent basis after replacing the furnace control, contact your distributor.
INDEX
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