508151-01
Issue 2104
Page 12 of 72
Code
Diagnostic Codes / Status of Equipment
Action Required to Clear and Recover
E180
Outdoor air temperature sensor failure. Only
shown if shorted or out of range (Communicating
systems only)
Compare outdoor sensor resistance to temperature resistance charts
in unit installation instructions. Replace sensor pack if necessary. At
beginning of (any) configuration, furnace or air handler control will sense
outdoor air and discharge air temperature sensor(s) If detected (reading
in range), appropriate feature will be set as installed and that could be
seen in 'About ' screen. In normal operation after control recognizes
sensors, alarm will be sent if valid temperature reading is lost. To get rid
of setting and alarm, redo configuration and make sure that temperature
sensor is marked as not installed in indoor Unit ‘About’ screen. When
indoor unit control is replaced thermostat will ‘tell’ new control if
temperature sensor is in system or not. Clears 30 seconds after fault
recovered.
E200
Hard Lock out - Rollout circuit open or previously
open
Correct cause of rollout trip or replace flame rollout switch. Test furnace
operation. Cleared after fault recovered.
E201
Indoor blower/communication failure - Unable to
communicate with blower motor
Indoor blower communication failure including power outage. Lost
communication with indoor blower motor. Possible causes: motor not
powered, loose wiring. Problem may be on control or motor side. Cleared
after fault recovered.
E202
Indoor blower motor mis-match - indoor motor
horsepower does not match unit capacity
Incorrect appliance capacity code selected. Check for proper configuring
under Unit Size Code for Furnace/Air Handler on configuration guide or
in installation instructions. Cleared after the correct match is detected
following a reset. (Remove thermostat from system while applying power
and reprogramming)
E203
Appliance capacity size is NOT programmed.
Invalid unit codes. Refer to configuration flow
chart.
No appliance capacity code selected. Check for proper configuring under
Unit Size Codes for Furnace on configuration guide or in installation
instruction. Critical Alert Cleared after valid unit code is read following
a reset (remove thermostat from system while applying power and
reprogramming)
E204
Gas valve mis-wired
Check gas valve operation and wiring. Clears when repaired.
E205
Gas valve control relay contact shorted
Check wiring on control and gas valve. If wiring is correct replace control.
E207
Hot surface igniter sensed open - Refer to
troubleshooting
Measure resistance of hot surface igniter. Replace if open or not within
specified range found in 10M. Resumes normal operation after fault is
cleared.
E223
Low pressure switch failed open
Check pressure(inches W.C) of low pressure switch closing on heat call.
Measure operating pressure (inches w.c.). Inspect vent and combustion
air inducer for correct operation and restriction. Resumes normal
operation after fault is cleared.
E224
Low pressure switch failed closed -Refer to
troubleshooting
Check pressure(inches W.C) of low pressure switch closing on heat call.
Measure operating pressure (inches w.c.). Inspect vent and combustion
air inducer for correct operation and restriction. Resumes normal
operation after fault is cleared.
E225
High pressure switch failed open -Refer to
troubleshooting
Check pressure(inches W.C) of high pressure switch closing on heat call.
Measure operating pressure (inches w.c. Inspect vent and combustion air
inducer for correct operation and restriction Resumes normal operation
after fault is cleared.
E226 High pressure switch failed closed -Refer to
troubleshooting
Check operation of high pressure closing on heat call. Measure operating
pressure (inches w.c.). Inspect vent and combustion air inducer for
correct operation and restriction. Resumes normal operation after fault is
cleared.
E227
Low pressure switch open during trial for ignition
or run mode. Refer to troubleshooting
Check operation of low pressure switch closing on heat call. Measure
operating pressure (inches w.c.). Inspect vent and combustion air inducer
for correct operation and restriction. Resumes normal operation after fault
is cleared.
E228
Combustion air inducer calibration failure
Unable to perform pressure switch calibration. Check vent system and
pressure switch wiring connections. Resumes normal operation after fault
is cleared.
Table 5. Integrated Diagnostic Codes/Status of Equipment