6–5 T-362
6.9 Microprocessor Malfunction
Will not control
Incorrect software and/or controller configuration Check
Defective sensor Section 7.29
Defective wiring Check
Low refrigerant charge Section 7.3
6.10 No Evaporator Air Flow or Restricted Air Flow
Evaporator coil blocked
Frost on coil Section 6.6
Dirty coil Section 7.15
No or partial evaporator air
flow
Evaporator fan motor internal protector open Section 7.17
Evaporator fan motor(s) defective Section 7.17
Evaporator fan(s) loose or defective Section 7.17
Evaporator fan contactor defective Replace
6.11 XtendFRESH not Operating
Vent not opening
Unit not Configured for XtendFRESH Operation No action
Cd43 in Off mode Enable Fresh Mode at
Cd43. Table 4–4
Wiring disconnected Check wiring
Unable to calibrate CO
2
sensor
CO
2
outside of acceptable levels Check
Check CO
2
sensor Enable Test Mode at Cd43.
Table 4–4
Code 44 displays “- - - - - “
Unit not Configured for XtendFRESH Operation No action
Check CO
2
sensor Enable Test Mode at Cd43.
Table 4–4
6.12 Electronic Expansion Valve Malfunction
Low suction pressure
Incorrect software and/or controller configuration Check
Failed suction pressure transducer (SPT) or
evaporator pressure transducer (EPT)
Replace
Suction service valve partially closed Open
Filter drier partially plugged Section 7.14
Low refrigerant charge Section 7.3
No evaporator air flow or restricted air flow Section 7.15
Excessive frost on evaporator coil Section 6.6
Evaporator fan(s) rotating backwards Section 7.17.3
EEV control malfunction Section 7.19
Failed digital unloader valve (DUV) Replace
Loose or insufficiently clamped sensor Replace
High suction pressure with
low superheat
Foreign material in valve Section 7.19
Failed suction pressure transducer (SPT) or
evaporator pressure transducer (EPT)
Replace
EEV control malfunction Replace
Improperly seated powerhead Ensure powerhead is
locked and in place
Condition Possible Cause Remedy / Reference
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