L8V1-SVX001-1A-EN
47
LED Fault Codes
LED ERROR ERROR EXPLANATION
POSSIBLE CAUSE/ACTION
E01
Loss of IRQ
Internal IFC failure
Replace IFC
E2.1
Retries Exceeded (5
retries, 6 total)
Flame never sensed (5 retries, 6 total results
in one hour lockout)
Gas valve not energized, flame sensor faulty, low
manifold pressure
E2.2
Recycles Exceeded (9
recycles, 10 total)
Flame sensed and lost (9 recycles, 10 total
results in one hour lockout)
Low manifold pressure, dirty burner system, weak
flame sensor
E2.3
External Lockout
First stage gas valve not energized when it
should be
Replace IFC
E2.4
HLO relay not energized when it should be Replace IFC
E3.1
Pressure Transducer
Error
Signal Not Present
Less than 0.25VDC @ 5.0VDC supply for 2
secs. (RD - GND)
Verify transducer tubing is connected and connector is
fully seated on the IFC Remove transducer from IFC
and verify ~4.8VDC from VCC - GND
Low supply voltage, replace IFC. Nominal supply
voltage, replace transducer
E3.2
Signal Out of Bounds
Greater than 4.25V @ 5.0V supply for 10
secs. (RD - GND)
Verify transducer tubing is connected and connector is
fully seated on the IFC Remove transducer from IFC
and verify ~4.8VDC from VCC - GND
Nominal supply voltage, replace transducer
E3.3
Insufficient Pressure
Inducer is unable to reach pressure setting at
maximum speed after 10 seconds. (PI - GND)
Verify transducer tubing is connected and connector is
fully seated on the IFC Remove transducer from IFC
and verify ~4.8VDC from VCC - GND
E04
Open Limit Switch
A thermal limit has opened in the safety
circuit
Primary, burner box, or reverse airflow limit tripped
Primary Limit - Dirty filter, restricted airflow Burner
Box Limit - High manifold pressure, clogged burner
inlet, dirty burner system
E05 Flame Sense Error
Flame sensed when no flame should be
present
Verify drip leg/sediment trap is installed. Remove gas
valve and inspect for signs of debris. Clear debris of
gas system and replace gas valve if necessary
E6.1
Reversed Polarity
Hot & neutral reversed
Triggered when Neutral - Ground voltage is greater
than 50VAC
E6.2 Ground Error Ground not detected
Triggered when Neutral - Ground voltage is greater
than 20VAC but less than 50VAC
E7.1
External Gas Valve Error
1st Stage Gas Valve (MVL) is Energized when
it should be Off
Verify 24VAC is not present on gas valve. Replace IFC
E7.2
Redundant Relay (HLO output) Energized
when it should be Off
Verify 24VAC is not present on gas valve. Replace IFC
E08 Low Flame Sense
Flame current is low, but still strong enough
to allow operation
Clean flame rod with steelwool only. Replace as
necessary
E10
Inducer Communication
Error
Inducer motor no communication response
Possibly caused by a communication failure between
two microcontrollers.
Replace IFC
E11 Internal Gas Valve Error
1st stage gas valve energized when it should
not be
Verify all wiring is correct and intact. Replace IFC
1st stage gas valve not energized when it
should be
Verify all wiring is correct and intact. Replace IFC
Redundant relay (HLO output) not energized
when it should be.
After 10 unsuccessful tries, E11 will populate
and enter into a one hour lockout
Verify all wiring is correct and intact. Replace IFC
E12
Open Fuse Low voltage fuse blown
Verify approved accessories are connected to xfmr
power. Reconnect low voltage field wiring, wire by
wire if necessary to eliminate components.
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