Allied A80US2VX - Page 12

508033-02Issue 2135Page 12 of 48
Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover
E124 Active communicating thermostat signal
missing for more than 3 minutes.
Equipment lost communication with the thermostat. Check four wiring
connections, ohm wires and cycle power at the thermostat. Alert stops
all services and waits for heartbeat message from thermostat (subnet
controller). Cleared after valid thermostat (subnet controller) message is
received.
E125 Control failed self-check, internal
error, failed hardware. Will restart if
error recovers. Integrated control not
communicating. Covers hardware errors
(ame sense circuit faults, pin shorts, etc.).
Hardware problem on the control. Cycle power on control. Replace if
problem prevents service and is persistent. Critical alert. Cleared 300
seconds after fault recovered.
E126 Control internal communication problem. Hardware problem on the control. Cycle power on control. Replace if
problem prevents service and is persistent. Cleared 300 seconds after fault
recovered.
E131 Corrupted control parameters (Verify
conguration of system). Communicating
only.
Recongure the system. Replace control if heating or cooling is not
available. Only applicable in the communicating mode, not in startup. Exit
from Commissioning and Execute ‘Set Factory Default mode Control will still
operate on default parameter settings
E180 Outdoor air temperature sensor failure.
Only shown if shorted or out-ofrange.
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 lockout - 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 Codes 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
instructions. 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.
E206 Gas valve second-stage relay failure Furnace will operate on 1st stage for remainder of the heating demand. Will
clear after fault recovered. If unable to operate 2nd stage, replace control.
E207 Hot surface ignitor sensed open. Measure resistance of hot surface ignitor. Replace if open or not within
specied range found in IOM. Resumes normal operation after fault is
cleared.
Table 5. Integrated Diagnostic Codes/Status of Equipment