Maytag Amana SXV9 Series Service And Troubleshooting page 86

Troubleshooting
Error Code:
21 - EEV control error
Applicable Models:
Outdoor AC
Outdoor HP
Method of Error Detection:
Detected by discharge pipe
superheat and EEV pulse.
Error Decision Conditions:
When discharge pipe superheat
became excessive low and EEV
pulse is minimum.
86
Board reads
21 on the
display
Was the
refrigerant No
charge weighed
in properly?
Yes
Is the indoor and
outdoor EEV coil
plugged into the PCB
No
correctly? Is the harness
extension connected
properly and free of
debris?
Yes
Is the coil
No
resistance of
the EEV within
range?
Yes
Are all of the
No
thermistors
connected
properly?
Yes
Does the
pressure switch
Yes
correspond to
the correct OHM
reading?
No
Error Code - 21
Recover the charge and weigh
in the appropriate amount
Connect properly and change
the harness as necessary
Replace the EEV coil
Connect the thermistors
properly. Replace the
thermistors if reading out of the
correct range
Replace the PCB
Replace pressure switch