Troubleshooting - Mitsubishi Electric PUHZ-W50VHA Technical Manual

7. Troubleshooting

A fl owing water sound or occasional hissing sound is
heard.
Water does not heat or cool well.
Water or vapor is emitted from the outdoor unit.
The operation indicator does not appear in the remote con-
troller display.
" " appears in the remote controller display.
When restarting the outdoor unit soon after stopping it, it does
not operate even though the ON/OFF button is pressed.
FTC operates without the ON/OFF button being pressed.
FTC stops without the ON/OFF button being pressed.
Remote controller timer operation cannot be set.
"PLEASE WAIT" appears in the remote controller display.
An error code appears in the remote controller display.
• If the unit cannot be operated properly after test run, refer to the following table to find the cause.
Wired remote controller
PLEASE WAIT
PLEASE WAIT → Error code
Display messages do not
appear even when operation
switch is turned ON (operation
lamp does not light up).
Note: Operation is not possible for about 30 seconds after cancellation of function selection. (Correct operation)
For description of each LED (LED1, 2, 3) provided on the FTC, refer to the following table.
LED1 (power for microcomputer)
LED2 (power for remote controller)
LED3 (communication between FTC and outdoor units)
■ Thease sounds can be heard when refrigerant is flowing in the
■ Clean the fi lter of water piping. (Flow is reduced when the fi lter is dirty or
■ Check the temperature adjustment and adjust the set temperature.
■ Make sure that there is plenty of space around the outdoor unit.
■ During cooling mode, water may form and drip from the cool pipes and
■ During heating mode, water may form and drip from the heat exchanger
■ During defrosting mode, water on the heat exchanger of outdoor unit
■ Turn on the power switch. " " will appear in the remote controller display.
■ During external signal control, "
■ Wait approximately 3 minutes. (Operation has stopped to protect the out-
■ Is the on timer set?
■ Is the FTC connected to a external signal?
■ Does "
■ Has the auto recovery feature from power failures been set?
■ Is the off timer set?
■ Is the air conditioner connected to a central remote controller?
■ Does "
■ Are timer settings invalid?
■ The initial settings are being performed. Wait approximately 3 minutes.
■ If the remote controller is not only for FTC, change it.
■ The protection devices have operated to protect the FTC and outdoor unit.
■ Do not attempt to repair this equipment by yourself.
Symptom
LED 1, 2 (PCB in outdoor unit)
For about 2
After LED 1, 2 are lighted, LED 2 is
minutes after
turned off, then only LED 1 is
power-on
lighted. (Correct operation)
Only LED 1 is lighted.
Subsequent to
about 2 minutes
after power-on
Only LED 1 is lighted.
Indicates whether control power is supplied. Make sure that this LED is
always lit.
Indicates whether power is supplied to the remote controller.
This LED lights only in the case of the FTC which is connected
to the outdoor unit refrigerant addresses "0".
Indicates state of communication between the FTC and outdoor
units.
Make sure that this LED is always blinking.
indoor unit, refrigerant pipe or when the refrigerant is chaging.
clogged.)
joints.
of outdoor unit.
evaporates and water vapor may be emitted.
play and FTC operation cannot be started or stopped using the remote
controller.
door unit.)
Press the ON/OFF button to stop operation.
Consult the concerned people who control the FTC.
" appear in the remote controller display?
Consult the concerned people who control the FTC.
Press the ON/OFF button to stop operation.
Press the ON/OFF button to restart operation.
Consult the concerned people who control the FTC.
" appear in the remote controller display?
Consult the concerned people who control the FTC.
If the timer can be set, WEEKLY
remote controller display.
Turn off the power switch immediately and consult your dealer. Be sure to
provide the dealer with the model name and information that appeared in
the remote controller display.
• For about 2 minutes following power-on,op-
eration of the remote controller is not possible
due to system start-up. (Correct operation)
• Connector for the outdoor unit's protection
→
device is not connected.
• Reverse or open phase wiring for the outdoor
LED 1, 2 blink.
unit's power terminal block (L1, L2, L3)
→ • Incorrect wiring between FTC and outdoor
(incorrect polarity of S1, S2, S3)
LED 1 blinks twice,
LED 2 blinks once.
• Remote controller wire short
77
" appears in the remote controller dis-
SIMPLE
AUTO OFF
, , or appears in the
Cause