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TROUBLESHOOTING
Green
Amber
Red LED
LED
LED
Flash
Flash
Flash
1
Flame sensed when no flame should be
present
2
Pressure switch stuck closed/ inducer
error
3
1st-stage pressure switch stuck open/
inducer error
4
Open limit switch
5
Open rollout/open fuse detect
6
1st-stage pressure switch cycle lockout
7
External lockout (retries)
8
External lockout (ignition recycles
exceeded where flame is established
and then lost)
9
Grounding or Reversed polarity
10
Module gas valve contacts energized
with no call for heat
11
Limit switch open – possible blower
failure overheating limit
12
Module Ignitor contact failure
Solid
Module - internal fault condition
Rapid
Twinning error
3
2nd-stage Pressure Switch Stuck Open/
double
Inducer Error
1
Normal Operation with call for first stage
heat
2
Normal Operation with call for second
stage heat
3
W2 present with no W1
4
Y present with no G call
Rapid
Low flame sense current
1
Standby or Call for Cool
Solid
Standby
Rapid
Normal Operation with call for fan (G)
1
Normal Operation with call for Low
stage cool (YLO + G)
2
Normal Operation with call for High stage
cool/or single stage cooling(YLO + G)
Emerson and White-Rodgers are
trademarks of Copeland. ©2023
Copeland. All rights reserved.
DIAGNOSTIC TABLE
Error/Condition
Verify the gas valve is operating and shutting down properly. Flame in
burner assemble should extinguish promptly at the end of the cycle.
Check orifices and gas pressure.
Pressure switch stuck closed. Check switch function, verify inducer is
turning off.
Check pressure switch function and tubing. Verify inducer is turning on
the pulling sufficient vacuum to engage switch.
Verify continuity through rollout switch circuit.
Verify continuity through rollout switch circuit, check fuse.
if the first stage pressure switch cycles 5 times (open, closed) during
one call for heat from the thermostat the control will lockout. Check
pressure switch for fluttering, inconsistent closure or poor vacuum
pressure.
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.
Check items for exceeded retries listed above and verify valve is not
dropping out allowing flame to be established and then lost.
Verify the control and furnace are properly grounded. Check and
reverse polarity (primary) if incorrect.
Verify valve is not receiving voltage from a short. If a valve wiring is
correct and condition persists, replace module.
Possible blower failure, restricted air flow through appliance or
duct work. Verify continuity through limit switch circuit and correct
overheating cause.
Fault code indicates the module ignitor contacts are not functioning
properly. Replace module.
Module contacts for gas valve not operating or processor fault. Reset
control. if condition persists replace module.
Check wire connections. If condition persists, replace module.
Check pressure switch function and tubing. Verify inducer is turning on
and pulling sufficient vacuum to engage switch.
Normal operation - first stage
Normal operation - first stage
Second stage call for heat on thermostat circuit with no call for first
stage. Verify dip switches are set for two stage thermostat and check
thermostat first stage circuit. Configured for a multi-stage thermostat the
Module will not initiate heating unless first stage call from thermostat is
received.
Module will allow cooling to operate with only a "Y signal from the
thermostat but will also trigger this code. Verify thermostat is energizing
both "Y" and "G" on call for cool. Check "G" terminal connections.
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 for
improve furnace and module ground. Verify sensor is located in or very
near flame as specified by the appliance manufacturer.
Normal operation. Waiting for call from thermostat or receiving
thermostat call for cool.
white-rodgers.com
Comments/Troubleshooting
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