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Diagnostics
TABLE 12
802V NORMAL OPERATION CODES
DIAGNOSTICS
Below are two lists; a list of normal operating codes and a
list of fault codes. The fault code list provides diagnostic
and troubleshooting information to help determine the
problem and fix it. Normal operating codes are not fault
codes and the presence of a normal operating code indi-
cates a no-fault condition.
NOTE: Verify display orientation is correct before interpret-
ing fault codes. Otherwise, the fault codes may be upside-
down. If a fault code or operating code is not on these
lists, the display may be upside-down.
Key
NORMAL OPERATION CODE
CODE
DISPLAYED
AT DUAL
SEVEN-
SEGMENT
DISPLAY OF
CONTROL
STANDBY MODE
DESCRIPTION: This code is displayed anytime there is no fault present and no thermostat call present. The furnace is idle.
GAS HEAT MODE
0
DESCRIPTION: This code is displayed anytime there is a call for cooling. The lower-case "c" is displayed when the thermostat
is requesting low-stage cooling and the upper-case "C" is displayed when the thermostat is requesting high-stage cooling.
NORMAL OPERATION CODES
NAME
COOLING MODE
Cd or cd
COOLING IN DE-HUMIDIFICATION MODE
DESCRIPTION: This code indicates that there is a both cooling and dehumidication demand present at the same time. When
de-humidification is active, the cooling airflow will be reduced in order to allow water to accumulate on the condenser therby
removing humidity from the conditioned environment. The lower-case "cd" is displayed when the thermostat is requesting low-
cooling with de-humidification and the upper-case "Cd" is displayed when the thermostat is requesting high-stage cooling with
de-humidification.
F
CONTINUOUS FAN MODE
DESCRIPTION: This code is displayed anytime there is a call for continuous fan from the thermostat.
dF
DEFROST MODE
DESCRIPTION: This code indicates that the heat-pump is in defrost mode (dual-fuel systems only) and furance is operating for
defrost operation which is fixed at low-stage gas heating operation.
DESCRIPTION
H or h
DESCRIPTION: This code is displayed anytime there is a call for gas heat. The lower-case "h" is displayed when the
thermostat is requesting low gas heat and the upper-case "H" is displayed when the thermostat is requesting high-stage gas
heat.
C or c
HP or hP
HEAT-PUMP HEATING MODE
DESCRIPTION: This code is displayed anytime there is a call for heat-pump heat. The lower-case "hP" is displayed when the
thermostat is requesting low-stage heat-pump heat and the upper-case "HP" is displayed when the thermostat is requesting high
stage heat-pump heat.
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