The following pages include troubleshoo!ng flowcharts in reference for
the 2 Stage S8V2* family of furnaces only.
The informa!on contained is for reference only and does not cover all
scenarios or problems that may be encountered.
ONLY qualified technicians should a$empt to install, troubleshoot, or
repair this appliance.
Failure to follow all cau!ons and /or warnings could result in personal or
property damage, including death.
Troubleshoo!ng Flowchart Index
Error Codes
E01 – Internal failure
E2.1 – Retries Exceeded (Flame Never Sensed)
E2.2 – Recycles Exceeded (Loss of Flame A%er Being Sensed)
E2.3 – 1
st
Stage Gas Valve energized when it should not be (10 !mes)
E3.1 – Shorted Pressure Switch, 1
st
Stage
E3.2 – Open Pressure Switch, 1
st
Stage
E3.3 – Shorted Pressure Switch, 2
nd
Stage
E3.4 – Open Pressure Switch, 2
nd
Stage
E04 – Open Thermal Limit
E4.1– Open Reverse Airflow Limit Switch
E4.2– Open Roll-Out Limit Switch
E05 – Flame Detected when it should not be present
E6.1 – Reversed Polarity (High Voltage)
E6.2 – Faulty Ground
E6.3 – Igniter Open or Igniter Relay Failure on IFC
E7.1 – 1
st
Stage Gas Valve (MVL) energized when it should not be
E7.2 – Redundant relay (HLO Output) Energized when it should not be
E08 – Flame Current Low, opera!on allowed
E11 – See troubleshoo!ng Instruc!ons
E12 – Open fuse
E13 – Blower HP / OEM Mismatch
E14 – IFC Configura!on Error
E17 – Blower Communica!on Error
E23 – Menu parameters not received by CCM
E24 – Internal Communica!on error between the ACM and CCM
E25 – Orienta!on Sensor Out of Bounds
E26 – 1) Return Sta!c Pressure Transducer out of Bounds
2) Return Sta!c Pressure Transducer Configured but not connected
E27 – 1) Return Air Thermistor out of Bounds
2) Return Air Thermistor Configured but not connected
E28 – 1) Supply Air Thermistor Out of Bounds
2) Supply Air Thermistor Configured but not connected
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