Mitsubishi PEH series User Manual

- 72 -
<Troubleshooting and repair by symptom>
Symptom and operation when normal
1. No remote controller display
2. Remote controller displays “H0” un-
changed.
3. When remote controller operation
switch pressed, operation display
appears but immediately disap-
pears.
4. Does not beep and air conditioner
does not operate even when oper-
ated with wireless remote control-
ler.
(Operation display appears on wire-
less remote controller.)
5. When operated with wireless re-
mote controller, beeps but does not
operate.
6. Remote controller display is normal
and cooling operation is performed,
but without any capacity (does not
cool).
Cause
1 DC14 V is not supplied to remote con-
troller.
(No power O display on liquid crystal
panel.)
2 DC14V is supplied to remote controller
but nothing is displayed.
- “H0” not displayed
- “H0” displayed
1 Remote controller displays “H0” for maxi-
mum of 2 minutes for starting after power
turned on.
2 Indoor-remote controller communication
faulty.
3 Outdoor-indoor communication faulty.
1 Operation switch is disabled for approxi-
mately 30 seconds after function select
operation from remote controller is re-
leased.
1 Wireless remote controller and indoor
controller board pair number setting mis-
matched.
2 Cause of item 1.
1 Air conditioner does not operate for a
maximum of 2 minutes after the power is
turned on.
2 Set to local operation prohibit mode.
- Remote start/stop adapter is con-
nected to CN32 on indoor controller
board.
- Air conditioner is connected to
MELANS and is set to local operation
prohibit mode from centralized control-
ler, etc.
3 Cause of item 2.
1 Insufficient refrigerant.
2 Filter clogged.
3 Outdoor unit heat exchanger clogged.
4 Air duct short cycle.
5 Outdoor unit bypass circuit faulty.
Symptom judgment and remedy
1 Check LED2 on indoor controller board.
1)Steady light
Check remote controller wire open or faulty
contact.
2)Flashing
Check for remote controller wire short.
3)Not lit
Check outdoor controller refrigerant address.
2 Make the following judgment:
- When “H0” is not displayed, remote control-
ler is faulty.
- When “H0” is displayed, see item 2.
1 Normal operation.
2 Remote controller self-diagnosis.
3 When outdoor-indoor cannot communicate
“H0” is displayed for a maximum 6 minutes.
Check LED3 on indoor controller board.
1)Does not flash
Check indoor/outdoor connection cable for er-
roneous wiring.
(S1 and S2 or S3 open)
2)Flashes
Indoor/outdoor connection cable is normal.
1 Normal operation.
1 Check pair number setting.
2 Item check of item 1.
1 Normal operation.
2 Normal operation.
3 Item check of item 2.
1 - When there is leakage, discharge tempera-
ture rises. Therefore, check by measuring
temperature.
- Check for gas leakage from piping connec-
tions, etc.
2 Open intake grille and check filter. Clean filter,
and remove dust and dirt.
3 - Since both indoor piping temperature and
outlet pressure rise when filter clogged, judge
by measuring outlet pressure.
- Clean heat exchanger.
4 Remove obstruction.
5 Check refrigerant circuit operation state.

Mitsubishi PEH series Specifications

General

Brand	Mitsubishi
Model	PEH series
Category	Air Conditioner
Language	English