Self-Diagnosis - Mitsubishi Electric PRH-P8MYA Technical & Service Manual

• Depending on the position of the SW2 switch on the outdoor-side controller board, the segments light up to indicate
the running condition of the unit and the particulars of the check code.
SW2 setting
123456
000000 Operation mode/relay output
011110 Outdoor-side control condition
Indoor-side control
010110
condition
011100 Error code history 1
111100 Error code history 2
*1 Display system for error indicator
The indicator corresponds to the following numbers
0 .......... Outdoor-side
1 .......... Indoor-side

[3] Self-diagnosis

Use the remote controller to look up the unit error history.
1.
ON
CHECK
CLOCK
ßC
STAND BY INDOOR UNIT
DEFROST ADDRESS NO
2.
ON
CHECK
CLOCK
ßC
STAND BY INDOOR UNIT
DEFROST ADDRESS NO
Item
tens place
units place
When an error occurs, the error
code and error signal (*1) are
displayed in alternation.
Control mode display system
(IC1)
Nothing
The error code (ex. U8, UA) and error indicator (*1) are displayed in alter-
nation.
1Hr.
OFF ßC
FILTER
CHECK MODE
FUNCTION
1Hr.
OFF ßC
FILTER
CHECK MODE
FUNCTION
Display contents
O: stop
C: cooling
H: heating
d: defrosting
1: SV1 Relay output = SV1 + 21S4 + 52C
2: 21S4
4: 52C
Ex. During cooling mode, when 52C and
SV1 are ON: C5
Display
0
1
Indoor-side
Outdoor-side 2
3
4
5
6
7
1. Change to self-diagnosis mode
Press the CHECK button twice within three seconds to show
the following
2. Select the refrigerant address number to be self-
diagnosed
Press the
refrigerant address numbers (00 to 15)and select the
refrigerant address number to be self-diagnosed.
After three seconds from making the change,the lit refrigerant
address to be self-diagnosed will start to flash,and self-
diagnosis will commence.
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Control mode
Indoor-side
Outdoor-side
←
Ordinary
←
Hot adjustment
←
Defrosting
←
—
←
Heater ON
←
Freeze prevention
←
Surge prevention
←
Compressor OFF
buttons to scroll through the