Hi-Wall Mounted Inverter Split Systems; Service Mode Display Procedure - Mitsubishi Heavy Industries SRK-ZSP-S Service Support Handbook

Hi-Wall Mounted Inverter Split Systems -

Term
The service mode is the mode where service data are displayed by flashing lights when the operations
Service Mode
These are the contents of error displays and protective stops which occurred I the past in the system.
Service Data Error display contents and protective stop data from past anomalous operations are saved in the indoor
unit controller's non-volatile memory. There are two types of data, self-diagnosis data and stop data.
These are the data which display error display (self-diagnosis display) occurred in an indoor unit. Data
Self-Diagnosis
are recorded for up to 5 previous occurrences. Data which is older than the 5th previous occurrence
Data
are erased. In addition, data on the temperature of each sensor are recorded when trouble occurs, so
(Error code)
These are the data which display the reason by which a stop occurred when the system performed
protective stops, etc. in the past. If stop data alone are generated, the system restarts automatically.
Stop Data
(Stop code) (Important) In cases where transient stop data only are generated, the system may still be normal.
However, if the same protective stop occurs frequently (3 or more times), it could lead to customer

Service mode display procedure

Turn off the A/C's power, and then
wait one minute or longer.
Turn the A/C \'s power back on while
pressing the unit ON/OFF button.
Did a buzzer located in
the indoor unit sound?
Within 1 minute after turning the A/C back on, signals
will be sent from the remote control
Count the number of times the RUN and TIMER lights flash
and check the contents of the error, etc. from the table.
Is other data displayed?
Change the remote controls settings based
on the instructions in the table (*4)
SERVICE MODE
described below are performed with the indoor controller
more detailed information can be checked.
Data older than the 10th previous occasion are erased.
Start
NO (*1)
(*2)
– SRK (R410A Models only)
Explanation
complaints
*1: If the buzzer does not sound no matter
how many times you repeat the
operation, the unit ON/OFF button may
*2: Set the remote controls settings on
"cooling operation", "fan speed MED" and
"Set temperature: 21C."
(*3)
,
Turn off the A/C's power to terminate the
NO
service mode.