25
R
b) The main power
supply voltage is lower
than 175V.
Check and ensure that the
mains power supply cable',
length and thickness, is
within the specifications, if
not replace with thicker
cable to ensure less voltage
drop.
c) No compressor relay
output from the PC
Board.
Check and/or replace
compressor relay or PC
Board.
6. Thermal relay damaged.
Replace the thermal relay.
17
Frost or ice
1. Fan is not working.
Refer to
"problem description
No.15
".
2. Insufficient refrigerant or the
refrigeration system is blocked.
1. Find the cause of blockage and replace the filter
and/or re-vacuum the system.
2. Check for leakages, if found, repair and re-charge
refrigerant as per volume specification on label.
3. If no leakage was found, re-charge refrigerant as
per volume specification on label.
3. The defrost parameter is not set
correctly.
Re-set the defrost parameter to the correct value.
4. The defrost sensor is not placed
correctly.
Replace the defrost sensor to the correct position.
5. The 4-way valve cannot be reversed
(The winding is damaged or the valve
cannot be correctly reversed).
Check the 4-way valve to find the cause replace the
winding or the 4-way valve.
6. Controller is damaged.
Replace the controller.
7. The refrigeration system has a
problem.
Check and repair refrigeration system.
