Allied A96US2V - Integrated Control Diagnostic Codes (E180-E226)

507404-02 Page 69 of 80Issue 1448
Integrated Control Diagnostic Modes (Continued)
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 rec-
ognizes 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 fur-
nace 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g-
uring under Unit Size Code for Furnace/Air Hander on conguration
guide or in installation instructions. Cleared after the correct match is
detected following a reset. (Remove thermostat from system while ap-
plying power and reprogramming)
E203 Appliance capacity size is NOT pro-
grammed. 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 instal-
lation instruction. Critical Alert Cleared after valid unit code is read fol-
lowing 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.
E206 Gas valve second-stage relay failure Furnace will operate on 1st stage for remainder of the heating de-
mand. Will clear after fault recovered. If unable to operate 2nd stage
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 -Re-
fer 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 com-
bustion 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 oper-
ating pressure (inches w.c.). Inspect vent and combustion air inducer
for correct operation and restrictio. Resumes normal operation after
fault is cleared.