Troubleshooting; Trouble Guide - Hitachi RPIL-1.0PNN1DH Service Manual

2. TROUBLESHOOTING

2. Troubleshooting

2.1 Trouble guide

Troubleshooting for normal malfunction
Troubleshooting
Air conditioner can not start up
The compressor starts or stops
frequently
Poor cooling/heating
Sound from deforming parts
Water leakage
Troubleshooting according to fault codes
When the air conditioner failure occurs, the fault code will display on control board, wired controller or
display panel.
How to check fault codes
Indoor unit
(1) Fault codes indicated by wired controller
MODEL: HCWA21NEHH
Possible Reasons of Abnormality
1. Power supply failure;
2. Trip of breaker or blow of fuse；
3. Power voltage is too low;
4. Improper setting of remote
controller ;
5. Remote controller is short of
power.
The air inlet and outle t have
1. The outdoor heat exchanger is dirty,
such as condenser;
2. There are heating devices indoors;
3. The air tightness is not enough, and
people come in and out too
frequently;
4. Block of outdoor heat e xchanger;
Improper setting of temperature.
5.
During system starting or stopping, a
sound might be heard.However, this is
due to the normal deformation of
plastic parts.
1. Drainage pipe is blocked or broken;
2. Wrap of refrigerant pipe joint is not
closed completely.
COOL
GROUP
ALARM
FIG.1 Fault code displays on wired controller
been blocked.
Error code
Error indicator
19
How to Deal With
1. Check power supply circuit;
2. Measure insulation resistance to
ground to see if there is any
leakage;
3. Check if there is a defective contact
or leak current in the power supply
circuit;
4. Check and set remote controller
again;
5. Change batteries.
Remove obstacles.
1. Clean the heat e xchanger of the
outdoor unit, such as condenser ;
2. Remove heating devices;
3. Keep certain air tightness indoors;
4. Remove block obstacles;
5. Check and try to set temperature
again.
It is not abnormal, and the sound will
disappear soon.
1. Change drainage pipe;
2. Re-wrap and make it tight.