58SU0A (Series 2 & 3): Troubleshooting Guide
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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Status Code 22 - Abnormal Flame-proving Signal
This status code indicates the flame signal was sensed while gas valve GV was de- energized. The inducer will run until the fault is cleared.
Status Code 23 - Transducer Greater than 0.15”
Transducer senses negative pressure greater than 0.15-in. w.c. at startup
STEP ACTION YES NO GO TO
1. Turn off gas to the furnace by shutting off the external manual shut-off valve. 2
2. Does status code 22 stop flashing? 3 4
3. Replace the gas valve. 11
4. Disconnect wire from the flame-proving sensor electrode FSE 5
5. Does status code 22 stop flashing? 6 8
6.
Remove and inspect burner box assembly and remove any carbon deposits near the flame sensor.
Clean flame sensor with fine steel wool. Reinstall flame sensor and burner box assembly. Reconnect
wire to flame sensor. Does status code 22 flash?
7 11
7. Replace flame sensor electrode FSE 11
8.
Inspect harness flame sensor wire from furnace control at PL1-1 to burner box assembly for knicks or
cuts and repair as needed
9
9. Does status code 22 flash? 10 11
10. Replace the furnace control. 11
11. Go to page number indicated in Index for CLEANUP AND START- UP INSTRUCTIONS. INDEX
STEP ACTION YES NO GO TO
1.
Turn power off, remove blower access panel, and disconnect R thermostat lead from the furnace control
board.
2
2. Depress door switch. Use a piece of tape to hold switch closed. Turn power ON 3
3. Jumper R and W thermostat terminals. 4
4. Does status code 23 flash? 10 5
5. Does a different status code flash? 8 6
6. Cycle the furnace multiple times to check for intermittent operation 7
7. Does the status code 23 ever flash? 10 9
8. Go to page number indicated in the Index for the section covering the status code. INDEX
9. Go to page number indicated in Index for CLEANUP AND START- UP INSTRUCTIONS. INDEX
10.
Check the transducer output signal. To do this, connect a DC voltmeter across terminals PL12-2 GREEN
(-) and PL12-3 BLACK (+).
11
11. Do you measure more than 0.65VDC? 16 12
12. Unplug the transducer connection at PL3 on the furnace control 13
13. Does the status code 23 continue to flash? 26 14
14. You have a short or miswire in the transducer wiring 15
15. Fix problem 9
16. Disconnect the jumper across the R and W thermostat terminal 17
17. Remove the pressure hose from its connection at the transducer 18
18. Do you still measure more than 0.65VDC? 19 20
19. Replace Transducer 15
20. Reconnect the pressure hose to the pressure transducer 21
21.
Connect 1 side of a slope manometer with a tee to the collector box pressure tap. Refer to pressure
check connection illustration in APPENDIX B: Transducer Operational Check
22
22. Is measured pressure more negative than -0.15-in. w.c. while furnace inducer is not operating? 25 23
23. Check pressure tubing for debris and blockage. 24
24. Reconnect the pressure hose to the pressure transducer and inducer housing port 6
25. Flue draft is too high. Check for proper vent sizing and monitor for excessive winds at termination 15
26. Replace the furnace control. 15
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