Troubleshooting ESIE98–06A
3–32 Part 3 – Troubleshooting
3
1
3
4
5
The valve will not
shift from cooling to
heating
The following list explains what the possible causes could be:
■ Check the electrical circuit. If there is no voltage to the coil, repair it.
■ Check the coil. If it is defective, replace it.
■ Check the refrigerant charge. If the charge is low, repair it and recharge the system. If the pressure
differential is too high, re check the system.
■ Check the following operation conditions to find the cause of the malfunction. The numbers in the
columns refer to the numbers in the drawing on the previous page:
1 2 3 4 5 6 Description
Hot Cool Cool as
in
column
2
Hot as
in
column
1
Temperature
of valve
body
Hot The pilot valve works correctly.
There is dirt in one bleed hole. To
resolve:
1 Deenergize the solenoid.
2 Raise the head pressure.
3 Reenergize the solenoid to
loosen the dirt.
4 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.
The piston cup head leaks. To
resolve:
1 Stop the unit.
2 After pressure equalization,
restart with energized
solenoid.
3 If the valve shifts, reattempt
with the compressor on. If
there is no reversal, replace
the valve.
Hot Cool Cool as
in
column
2
Hot as
in
column
1
Temperature
of valve
body
Temperature
of valve
body
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 Cool as
in
column
2
Hot as
in
column
1
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.
Warm Cool Cool as
in
column
2
Hot as
in
column
1
Temperature
of valve
body
Warm The compressor is defective.
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