ESIE98–06A Troubleshooting
Part 3 – Troubleshooting 3–33
33
4
5
1
The valve starts to
shift but does not
complete the
reversal
The following list explains what the possible causes could be. The numbers in the columns refer to the
numbers in the drawing: page 3-31:
1 2 3 4 5 6 Description
Hot Warm Warm Warm Temperature
of valve
body
Hot There is not enough pressure
differential at start of stroke or
not enough flow to maintain the
pressure differential. To resolve:
1 Check the unit for correct
operating pressure and
charge.
2 Raise the head pressure.
3 If there is still no shift, replace
the valve.
There is body damage. Replace
the valve.
Hot Warm Warm Hot Hot Hot Both parts of pilot are still open.
To resolve:
1 Raise the head pressure.
2 Operate the solenoid to free
the partially clogged port.
3 If there is still no shift, replace
the valve.
Hot Hot Hot Hot Temperature
of valve
body
Hot There is body damage. Replace
the valve.
The valve hung up at mid-stroke.
The pumping volume of the
compressor is not sufficient to
maintain the reversal. To
resolve:
1 Raise the head pressure.
2 Operate the solenoid.
3 If there is still no shift, replace
the valve.
Hot Hot Hot Hot Hot Hot Both parts of pilot are still open.
To resolve:
1 Raise the head pressure.
2 Operate the solenoid to the
free partially clogged port.
3 If there is still no shift, replace
the valve.
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