|
|
| TROUBLESHOOTING |
Red LED |
|
| |
|
|
| |
|
|
| |
Flash | Error/Condition | Comments/Troubleshooting | |
|
|
|
|
1 | External lockout (exceeded retries) | Failure to sense flame is often caused by carbon deposits on | |
|
| the flame sensor, a disconnected or shorted flame sensor lead | |
|
| or a poorly grounded furnace. Carbon deposits can be cleaned | |
|
| with emery cloth. Verify sensor is not contacting the burner | |
|
| and is located in a good position to sense flame. Check sensor | |
|
| lead for shorting and verify furnace is grounded properly. Verify | |
|
| gas supply to valve, gas valve in "On" position and appliance | |
|
| lighting properly. Verify flame reaches flame sensor during | |
|
| ignition attempts and gas pressures are correct. | |
|
|
|
|
2 | Pressure switch stuck closed | Pressure switch stuck closed. Check switch function, verify | |
|
| inducer is turning off. Refer to wiring diagram, terminals PSI / | |
|
| PSO. | |
|
|
|
|
3 | Pressure switch stuck open | Check pressure switch function and tubing. Verify inducer is | |
|
| turning on and pulling sufficient vacuum to engage switch. | |
|
| Refer to wiring diagram, terminals PSI / PSO. | |
|
|
|
|
4 | Open high temperature limit switch | Verify continuity through limit switch circuit. Refer to wiring | |
|
| diagram terminals, HLI / HLO. | |
|
|
|
|
5 | Flame sensed with gas valve | Verify the gas valve is operating and shutting down properly. | |
|
| Flame in burner assembly should extinguish promptly at the | |
|
| end of the cycle. Check orifices and gas pressure. | |
|
|
|
|
6 | Open rollout switch | Verify continuity through rollout switch circuit. Refer to wiring | |
|
| diagram terminals, RO IN / RO OUT. | |
|
|
|
|
7 | Low flame sense current | Low flame sense current is often caused by carbon deposits on | |
|
| the flame sensor, a poorly grounded furnace or a | |
|
| flame sense probe. Carbon deposits can be cleaned with | |
|
| emery cloth. Check or improve furnace and module ground. | |
|
| Verify sensor is located in or very near flame as specified | |
|
| by the appliance manufacturer. Refer to wiring diagram FS | |
|
| terminal and GND. | |
|
|
|
|
8 | Ignitor relay fault | This flash code does not indicate a broken, disconnected or | |
|
| shorted ignitor. It indicates the ignitor relay contacts on the | |
|
| ignition module are not functioning properly. Replace the | |
|
| ignition module. | |
|
|
|
|
Rapid Flash | Reversed polarity | Verify the control and furnace are properly grounded. Check | |
|
| and reverse polarity (primary or secondary) if incorrect. | |
|
|
|
|
Continuous | Normal operation | No fault | |
On |
|
|
|
|
|
|
|
Off | Control failure | Verify power to the control, replace control if power is at the | |
|
| control and no lit Red LED | |
|
|
|
|
The Emerson logo is a trademark and service mark of8 Emerson Electric Co.
