White Rodgers 50M56-7433 Red LED Flash Error/Condition Comments/Troubleshooting

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TROUBLESHOOTING

Red LED

 

 

 

 

Flash

Error/Condition

Comments/Troubleshooting

 

 

 

1

External lockout

Failure to sense flame is often caused by carbon deposits on the flame

 

(exceeded retries)

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.

 

 

Ignitor must be positioned to light the gas immediately when the valve

 

 

opens. If the ignitor has been replaced, verify hot spot position has not

 

 

changed.

 

 

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

Pressure switch stuck closed. Check switch function, verify inducer is

 

closed

turning off. Refer to wiring diagram, terminals PSI / PSO.

 

 

 

3

Pressure switch stuck

Check pressure switch function and tubing. Verify inducer is turning on

 

open

and pulling sufficient vacuum to engage switch. Refer to wiring diagram,

 

 

terminals PSI / PSO.

 

 

 

4

Open high temperature

Verify continuity through limit switch circuit. Refer to wiring diagram

 

limit switch

terminals, HLI / HLO.

 

 

 

5

Flame sensed with gas

Verify the gas valve is operating and shutting down properly. Flame in

 

valve

burner assembly should extinguish promptly at the end of the cycle. Check

 

de-energized

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 mis-aligned 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 On

Normal operation

No fault

 

 

 

Off

Control failure

Verify power to the control, replace control if power is at the control and no

 

 

lit Red LED

 

 

 

White-Rodgers is a business of Emerson Electric Co.

The Emerson logo is a trademark and service mark of Emerson Electric Co.

Homeowner Help Line: 1-800-284-2925

www.white-rodgers.com

www.emersonclimate.com

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Contents Installation Instructions PrecautionsContents DescriptionHumidity Range Mounting SpecificationsElectrical Ratings @ 77F 25C Installation Mounting and WiringWiring Typical System Wiring DiagramSystem Component Option Switches Heat ModeCool Mode Manual FAN on ModeSystem Lockout and Diagnostic Features System Lockout FeaturesDiagnostic Features Fault Code ResetTroubleshooting Red LED Flash Error/Condition Comments/Troubleshooting

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