Pioneer WD Series, Руководство по обслуживанию

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11
(4) Display E4
Symptom Display E4
Cause
System abnormal: Let the compressor run for 5
minutes. If the indoor coil temperature cannot
be 2 lower than that before the compressor is
℃
started (2 higher for heating mode), it can be
℃
judged that the system is abnormal.
S/N Inspections How to Solve Remarks
1
Check the high-pressure and
low-pressure valves. If not open, open again to ensure
the system circulation is smooth. Photo 5
2
Check the system refrigerant (Start
and run under cooling mode. When
the compressor is started, check the
outlet temperature for its change. If
the change is not obvious after 5
minutes) The system is in shortage of
refrigerant. Test with pressure
gauge, check the leakage point
and recharge the refrigerant. Photo 6
3
Check the evaporator coil
temperature sensor (25 /5K
Ω ). ℃
For other resistance, please refer to
the Temperature – Resistance
Sheet.
Replace the temperature sensor
if the resistance is incurred to
drift, open or short circuiting. Photo 7
1. The flow might be uneven for
indoor system. Short circuit JP4
jumper of the indoor control
board to shield this protection
function (V1 – Indoor Main
PCB). Photo 8
2. The flow might be uneven for
indoor system. Dial the JP4
switch of the outdoor power
source board to position “1” to
shield this protection function
(V4 – Power Source Board). Photo 9
4 The above inspections are normal
Replace the indoor main PCB
if the problem cannot be solved
by using the above methods.