Microprocessor Malfunction; 6.10 No Evaporator Air Flow Or Restricted Air Flow; 6.11 Eautofresh Not Operating; 6.12 Electronic Expansion Valve Malfunction - Carrier Transicold 69NT40-561-001 Operation And Service Manual

Condition
6.9

Microprocessor Malfunction

Will not control

6.10 No Evaporator Air Flow Or Restricted Air Flow

Evaporator coil blocked
No or partial evaporator
air flow

6.11 eAutoFresh Not Operating

Vent not opening
Gas Limit mode unavailable
Unable to calibrate
CO sensor
2
Code 44 displays "- - - - - "

6.12 Electronic Expansion Valve Malfunction

Low suction pressure
T-340
Possible Cause
Incorrect software and / or controller configuration
Defective sensor
Defective wiring
Low refrigerant charge
Frost on coil
Dirty coil
Evaporator fan motor internal protector open
Evaporator fan motor(s) defective
Evaporator fan(s) loose or defective
Evaporator fan contactor defective
Unit not configured for eAutoFresh Operation
Cd43 in OFF mode
Wiring disconnected
Stepper drive defective
Stepper motor defective
Unit operating in frozen mode
Check CO sensor
2
Wiring disconnected
Unit operating in frozen mode
ENTER Key not held for sufficient length of time
CO outside of acceptable levels
2
Check CO sensor
2
Unit not configured for eAutoFresh Operation
Check CO sensor
2
Incorrect software and / or controller configuration
Failed suction pressure transducer (SPT) or evapora-
tor pressure transducer (EPT)
Suction service valve partially closed
Filter drier partially plugged
Low refrigerant charge
No evaporator air flow or restricted air flow
Excessive frost on evaporator coil
Evaporator fan(s) rotating backwards
Electronic expansion valve (EEV) control malfunction
Failed digital unloader valve (DUV)
Loose or insufficiently clamped sensor
6–4
Remedy / Reference
Check
Section 7.24
Check
Section 7.3
Section 6.6
Section 7.14
Section 7.15
Section 7.15
Section 7.15
Replace
No action
Section 5.4.2
Check wiring
Section 7.27.2
Section 7.27.4
Section 5.4.3
Section 5.4.3
Check wiring
Section 5.4.3
Section 5.4.3
Check
Section 5.4.3
No action
Section 5.4.3
Check
Replace
Open
Section 7.13
Section 7.3
Section 7.14
Section 6.6
Section 7.15.3
Section 7.17
Section 6.6
Replace