58SU0A (Series 2 & 3): Troubleshooting Guide
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10
Status Code 11 - No Previous Code
Stored status codes are erased after 72 hours Run system through a heating or cooling cycle to check system.
Status Code 12 - Blower on After Power Up
Blower will run for 90 seconds when furnace power is interrupted and later restored during a call for heat (R-W closed) or if the call for heat is interrupted
(R-W opens) during the blower on-delay period.
STEP ACTION YES NO GO TO
1. No Previous Fault Codes – Stored status codes are erased automatically after 72 hours INDEX
STEP ACTION YES NO GO TO
1. Remove the blower access panel and disconnect the W thermostat lead from the furnace control 2
2. Depress the door switch. Use piece of tape to hold it closed. 3
3.
Set the thermostat to call for heat and set the fan control to the AUTO position (if equipped).
Reconnect the W thermostat lead to the furnace control
4
4.
Does the furnace keep repeating the following cycle?
Induced draft motor starts and runs for less than 5 seconds, induced draft motor IDM stops, blower
motor BLWM runs for 90 seconds while AMBER LED status light flashes status code 12.
5 14
5. Do you have less than 18-VAC across R and COM-24V on the furnace control? 6 14
6. Do you have less than 90-VAC across L1 and NEUTRAL-L2 on the furnace control? 7 10
7.
Make sure wire gage between main fuse box and furnace complies with wire size specification in
Installation, Start-Up, and Operating Instructions.
8
8. Fix problem. 9
9. Go to the page number indicated in Index for the CLEANUP AND START-UP INSTRUCTIONS. INDEX
10. Disconnect the R thermostat lead 11
11. Do you have less than 19-VAC across the R and COM24V on the furnace control? 12 13
12. Replace transformer 8
13.
The thermostat or the thermostat wires are loading down the transformer. Replace the thermostat or
repair the thermostat wires
8
14.
Does the furnace keep repeating the following cycle?
Induced draft motor starts and runs for more than 15 seconds, induced draft motor IDM stops, blower
motor BLWM runs for 90 seconds while AMBER LED status light flashes status code 12.
15 24
15. Disconnect the Igniter at PL13 16
16. Does the furnace still abruptly shut down as described in Step 14. 20 17
17. Does the furnace display a fault code 34? 18 19
18. There is a short in the igniter wiring or igniter 8
19. Reconnect the igniter at PL13 20
20.
Does the furnace keep repeating the following cycle?
Induced draft motor starts and runs for 30 seconds, Gas Valve Relay clicks, induced draft motor IDM
stops, blower motor BLWM runs for 90 seconds while AMBER LED status light flashes status code 12.
21 25
21. Disconnect the humidifier lead (if used) from HUM terminal on the furnace control. 22
22.
Does the furnace still alternately cycle induced draft motor IDM and blower motor BLWM as described
in Step 20.
23 24
23. There is a short in the gas valve GV or wiring to gas valve GV. 8
24.
There is a direct short in wiring to humidifier solenoid coil, diode bridge (if used), or humidifier solenoid
coil.
8
25.
Power to the furnace was probably interrupted or line voltage was too low during a call for heat. This is
normal operation. Go to the page number indicated in Index for the CLEANUP AND START-UP
INSTRUCTIONS.
INDEX
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