Allied A80US2V - Page 12

508155-01Issue 2108Page 12 of 49
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) conguration, 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 conguration 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 ame 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 conguring
under Unit Size Code for Furnace/Air Handler on conguration 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 conguration ow
chart.
No appliance capacity code selected. Check for proper conguring under
Unit Size Codes for Furnace on conguration 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
specied 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