Troubleshooting - Emerson White Rodgers 50A65-5165 Installation Instructions Manual

TROUBLESHOOTING

Red LED
Flash Error/Condition
Slow Flash Normal operation
Fast Flash Normal operation
2 External lockout (exceeded retries)
3 Pressure switch problem, vent on Inducer
problem
4 Open high temperature limit switch
5 Flame sensed with gas valve de-energized
6 Reversed polarity
7 Gas valve circuit error
8 Low flame sense current
9 Ignition fault
Continuous Control failure
On
Off Control failure
White-Rodgers is a business
of Emerson Electric Co.
The Emerson logo is a
trademark and service mark
of Emerson Electric Co.
TECHNICAL SUPPORT: 1-888-725-9797
white-rodgers.com
emersonclimate.com
Comments/Troubleshooting
Normal – no Call for Heat
Normal – Call for Heat
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.
Check switch function, verify inducer is working correctly. Refer
to wiring diagram, terminals PS.
Verify continuity through limit switch circuit. Refer to wiring
diagram terminals, HLO.
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.
Verify the control and furnace are properly grounded. Check
and reverse polarity (primary or secondary) if incorrect.
Indicates the gas valve relay contacts on the ignition module is
not functioning properly. Replace the ignition module.
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.
Check ignitor or improper grounding
Replace IFC
Verify power to the control