Mitsubishi Electric PLH-1.6KKHB [40/52] Cd 4 troubleshooting
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Mitsubishi Electric PLH-1.6KKHB [40/52] Cd 4 troubleshooting

Mitsubishi Electric PLH-4AAKH [40/52] Cd 4 troubleshooting
40
4
4. Troubleshooting
Before you call out a repair man, check the following table to see whether there is a simple solution to your problem.
E
NOTE: After a power cut, the unit will not restart automatically. You will have to restart it by pressing the POWER - ON/OFF button on the remote controller.
If none of the above apply, turn the main switch off and contact the dealer from whom you bought the air-conditioner, telling him the model name and the nature of the problem.
Do not try to fix the unit yourself.
Wired remote controllers
In any of the following cases, turn off the main power switch and contact your local dealer for service:
• “CHECK” followed by “P1”, “P2”, “P3”, “P4”, “P5”, “P7” or “CENTRALLY CONTROLLED” is displayed on the control panel.
• The switches do not work properly.
• The circuit breaker trips frequently (or the fuse blows frequently).
• Water has accidentally been splashed into the unit.
• Water leaks from the unit.
• Something is accidentally dropped into the air-conditioner.
• An unusual noise is heard during operation.
Wireless remote controllers: The Operating LED blinks.
The following do not indicate any malfunction:
Odours: smells such as tobacco or cosmetic odours may persist after they have been sucked into the unit.
Sound of liquid flowing inside indoor unit: this can occur during or after operation and is simply the sound of refrigerant being circulated inside the unit.
Ticking sound coming from indoor unit: this can occur when cooling or heating has just begun or has just stopped. It is caused by the indoor unit shrinking or expanding slightly
due to the change in temperature.
The message “CENTRALLY CONTROLLED” appearing on the LCD panel: from time to time, this message may come up on the LCD panel. This does not indicate any
malfunction.
NOTE: The refrigerant charged in the air conditioner is safe. Refrigerant normally does not leak, however, if refrigerant gas leaks indoors, and comes into contact
with the fire of a fan heater, space heater, stove, etc., harmful substances will be generated.
Be sure to ask the service representative whether there is refrigerant leakage or not when repairs are carried out.
Problem
Unit will not start.
Unit discharges air well, but fails to cool
or heat the room well.
Unit does not start immediately.
Unit stops soon after starting.
Cause
Main power switch is turned off.
Main power fuse has blown.
Outdoor unit’s ground fault breaker is open.
A power cut has occurred (see NOTE be-
low).
Improper temperature setting - e.g. you
have selected COOL mode, but the desired
temperature setting is higher than the cur-
rent room temperature.
Filters are clogged.
Outdoor unit’s intake or outlet is obstructed.
A door or window has been left open.
Unit is waiting three minutes before restart-
ing.
Indoor or outdoor unit’s intake or outlet is
obstructed.
Filters are clogged.
Solution
Turn main power on. Then press the
POWER ON/OFF button to turn the unit
on.
Replace the fuse.
Reset the ground fault breaker.
Wait until power is restored, then press
the POWER ON/OFF button to turn the
unit on.
Check the set temperature on the remote
controller and the actual intake air tem-
perature. Use the COOLER and
WARMER buttons to set the temperature
as described in “Selecting a temperature”
on page 18.
Clean the filter and resume operation.
See “Cleaning the filters and the indoor
unit” on page 30.
Remove the obstruction.
Shut door or window.
Wait until the unit restarts automatically.
The compressor may hesitate resuming
because a three-minute resume preven-
tion circuit is incorporated in the outdoor
unit for protection of the compressor.
Remove obstruction and restart the unit.
Remove the obstruction. Clean the filter
and resume operation. See “Cleaning
the filters and the indoor unit” on page
30.
Display reading
Pilot lamp does not turn on even when the
POWER ON/OFF button is pressed.
Remote controller shows that the unit is
operating.
Remote controller shows that the unit is
operating.
Remote controller check display reads
“CHECK P6” or “CHECK P8”.

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CD 4 Troubleshooting Before you call out a repair man check the following table to see whether there is a simple solution to your problem Problem Unit will not start Display reading Pilot lamp does not turn on even when the Cause Solution Main power switch is turned off Turn main power on Then press the POWER ON OFF button is pressed POWER ON OFF button to turn the unit on Main power fuse has blown Replace the fuse Outdoor unit s ground fault breaker is open Reset the ground fault breaker A power cut has occurred see NOTE be Wait until power is restored then press low the POWER ON OFF button to turn the unit on Unit discharges air well but fails to cool Remote controller shows that the unit is Improper temperature setting e g you Check the set temperature on the remote or heat the room well operating have selected COO Lmode butthedesired temperature setting is higher than the cur controller and the actual intake air tem perature Use the COOLER and rent room temperature WARMER buttons to setthe temperature as described in Selecting a temperature on page 18 Filters are clogged Clean the filter and resume operation See Cleaning the filters and the indoor unit on page 30 Unit does not start immediately Outdoor unit s intake or outlet is obstructed Remove the obstruction A door or window has been left open Shut door or window Remote controller shows that the unit is Unit is waiting three minutes before restart Wait until the unit restarts automatically operating ing The compressor may hesitate resuming because a three minute resume preven tion circuit is incorporated in the outdoor unit for protection of the compressor Unit stops soon after starting Remote controller check display reads Indoor or outdoor unit s intake or outlet is CHECK P6 or CHECK P8 obstructed Filters are clogged Remove obstruction and restart the unit Remove the obstruction Clean the filter and resume operation See Cleaning the filters and the indoor unit on page 30 NOTE After a power cut the unit will not restart automatically You will have to restart it by pressing the POWER ON OFF button on the remote controller If none of the above apply turn the main switch off and contact the dealer from whom you bought the air conditioner telling him the model name and the nature of the problem Do not try to fix the unit yourself Wired remote controllers In any of the following cases turn off the main power switch and contact your local dealer for service CHECK followed by P1 P2 P3 P4 P5 P7 or CENTRALLY CONTROLLED is displayed on the control panel The switches do not work properly The circuit breaker trips frequently or the fuse blows frequently Water has accidentally been splashed into the unit Water leaks from the unit Something is accidentally dropped into the air conditioner An unusual noise is heard during operation Wireless remote controllers The Operating LED blinks The following do not indicate any malfunction Odours smells such as tobacco or cosmetic odours may persist after they have been sucked into the unit Sound of liquid flowing inside indoor unit this can occur during or after operation and is simply the sound of refrigerant being circulated inside the unit Ticking sound coming from indoor unit this can occur when cooling or heating hasjust begun or has just stopped It is caused by the indoor unit shrinking or expanding slightly due to the change in temperature The message CENTRALLY CONTROLLED appearing on the LCD panel from time to time this message may come up on the LCD panel This does not indicate any malfunction NOTE The refrigerant charged in the airconditioner is safe Refrigerant normally does not leak however if refrigerant gas leaks indoors and comes into contact with the fire of a fan heater space heater stove etc harmful substances will be generated Be sure to ask the service representative whether there is refrigerant leakage or not when repairs are carried out 40

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