Display E4 - Pioneer WYD-GLFI SERIES Service Manual

(4) Display E4

Symptom
Cause
S/N
Check the
1
low-pressure valves.
Check the system refrigerant (Start
and run under cooling mode. When
the compressor is started, check the
2
outlet temperature for its change. If
the change is not obvious after 5
minutes)
Check the
temperature sensor (25 /5KΩ).
3 For other resistance, please refer to
the Temperature
Sheet.
4 The above inspections are normal
Inspections
high-pressure and
evaporator coil
℃
– Resistance
Display E4
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.
How to Solve
If not open, open again to ensure
the system circulation is smooth.
The system is in shortage of
refrigerant. Test with pressure
gauge, check the leakage point
and recharge the refrigerant.
Replace the temperature sensor
if the resistance is incurred to
drift, open or short circuiting.
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).
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).
Replace the indoor main PCB
if the problem cannot be solved
by using the above methods.
11
Remarks
Photo 5
Photo 6
Photo 7
Photo 8
Photo 9