Service Mode (Trouble Mode Access Function) - Mitsubishi SRK25ZSP-W Service Manual

(6) Service mode (Trouble mode access function)

This air-conditioner is capable of recording error displays and protective stops (service data) which have occurred in the
past. If self-diagnosis displays cannot be confirmed, it is possible to get a grasp of the conditions at the time trouble oc-
curred by checking these service data.
(a) Explanation of terms
Term
Service mode
Service data
Self-diagnosis data
Stop data
(b) Service mode display procedure
Turn off the air-conditioner's power once, then
wait 1 minute or longer.
Turn the air-conditioner's power on again while
pressing the unit ON/OFF button.
NO (*1)
Did a buzzer located in
the indoor unit sound?
Within 1 minute after turning the air-condition-
er's power on, signals will be sent from the
remote control.
Count the number of times the RUN light and
TIMER light flash
error, etc. from the table. (See pages 22.)
Are other data displayed?
Change the wireless remote control settings based
on the instructions in the table
The service mode is the mode where service data are displayed by flashing of the display lights
when the operations in item (b) below are performed with the indoor control.
These are the contents of error displays and protective stops which occurred in the past in the air-
conditioner system. Error display contents and protective stop data from past anomalous
operations of the air-conditioner system are saved in the indoor unit control's non-volatile
memory (memory which is not erased when the power goes off). There are two types of data,
self-diagnosis data and stop data, described below.
These are the data which display the reason why a stop occurred when an error display (self-
diagnosis display) occurred in an indoor unit. Data are recorded for up to 5 previous occurrences.
Data which are older than the 5th previous occurrence are erased.
In addition, data on the temperature of each sensor (room temperature, indoor heat exchanger,
outdoor heat exchanger, outdoor air temperature, discharge pipe), wireless remote control
information (operation switching, fan speed switching) are recorded when trouble occurs, so more
detailed information can be checked.
These are the data which display the reason by a stop occurred when the air-conditioning system
performed protective stops, etc. in the past. Even if stop data alone are generated, the system
restarts automatically. (After executing the stop mode while the display is normal, the system
restarts automatically.) Data for up to 10 previous occasions are stored. Data older than the 10th
previous occasion are erased.
( Important) In cases where transient stop data only are generated, the air-conditioner system
may still be normal. However, if the same protective stop occurs frequently (3 or
more times), it could lead to customer complaints.
Start
YES
(*2)
(*3)
, and check the contents of the
YES
(*4)
. (See page 20.)
-
Explanation
*1: If the buzzer does not sound no matter how
many times you repeat the operation, the
unit ON/OFF button may be faulty.
*2: Set the wireless remote control's settings on
"Cooling operation," "Fan speed: MED" and
"Set temperature: 21ºC."
Turn off the air-conditioner's power to terminate the
NO
service mode. If you are going to turn the power on
again, wait 1 minute or longer after turning it off.
19
-
'18 • SRK-SM-259