Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 917

Error display : e2
4
Indoor unit
Red LED 1 time flash
Green LED Keeps flashing
More than 49 indoor
unit are connected?
Defective indoor unit
PCB Replacement
(defective unit number circuit)
e6
Error display :
5
Indoor unit
Red LED 1 time flash
Green LED Keeps flashing
Is the indoor
unit heat exchanger
thermistor connector
connection OK?
NO
Correction
e7
Error display :
6
Indoor unit
Red LED 1 time flash
Green LED Keeps flashing
Is the return air
thermistor connector
connection OK?
[Duplicated indoor unit No. or More than 49 indoor unit are connected.]
Outdoor unit
Red LED
Green LED
Is the indoor unit
YES
No. duplicated or
NO
(2)
[Defective indoor unit heat exchanger thermistor]
Outdoor unit
Red LED
Green LED
Defective indoor unit PCB
ment (Defective indoor unit heat
exchanger themistor input circuit)
Are characteristics
YES
of indoor unit heat
exchanger thermistor OK
or is there any
broken wire?
Defective indoor unit heat exchanger
themistor Replacement
[Detective Return air thermistor]
Outdoor unit
Red LED
Green LED
YES
NO
Correction
Stays OFF
Keeps flashing
(1)
Correction of unit No.
setting
Notes (1) When correcting the unit number, check again the pairing of indoor/
outdoor units (same Number assigned to coupled units) is correct.
(2) If it is normalized by changing PCB, judge the unit number input
circuit is defective.
Stays OFF
Keeps flashing
Replace-
YES
NO
Stays OFF
Keeps flashing
Is the return air
YES
thermistor characteristics
OK or is there a
broken wire?
NO
Defective return air
thermistor Replacement
FDC-HKX
Return air thermistor (Th A)
1-
Indoor unit heat exchanger thermistor
(Th R)
1-
Resistance temperature characteristics
15
10
5kΩ at 25˚C
5
0 10 20 30 40
Temperature (˚C)
Note (1) 22.5 kΩ at -6˚C
Defective indoor unit PCB
Replacement (Defective return air
thermistor input circuit)
Note (1) Characteristics as per the above
graph.
50
915