Troubleshooting ESIE98–06A
3–34 Part 3 – Troubleshooting
3
1
3
4
5
The valve will not
shift from heating to
cooling
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 Cool Hot as
in
column 1
Cool as
in
column 1
Temperature
of valve
body
Temperature
of valve
body
The pressure differential is
too high. To resolve:
1 Raise the head pressure.
The valve will reverse
during pressure
equalization period.
2 Recheck the system.
The pilot tubes are clogged.
To resolve:
1 Raise the head pressure.
2 Operate the solenoid to
free the dirt.
3 If there is still no shift,
replace the valve.
Hot Cool Hot as
in
column 1
Cool as
in
column 1
Hot Temperature
of valve
body
There is dirt in one bleed
hole. To resolve:
1 Raise the head pressure.
2 Operate the solenoid.
3 If unsuccessful, remove
the valve and wash it out.
Check on air before
reinstalling. If there is still
no movement, replace the
valve, add a new strainer
to the discharge tube and
mount the valve
horizontally.
Hot Cool Hot as
in
column 1
Cool as
in
column 1
Hot temperature
of valve
body
The piston cup head leaks. To
resolve:
1 Stop the unit.
2 After pressure
equalization, restart with
the solenoid deenergized.
3 If the valve shifts,
reattempt with the
compressor on. If there is
no reversal, replace the
valve.
Hot Cool Hot as in
column 1
Cool as
in
column 1
Hot Hot The pilot is defective, replace
the valve.
Warm Cool Warm as
in
column 1
Cool as
in
column 1
Warm Temperature
of valve body
The compressor is defective.
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