Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 90

SRK-H
(5) Trouble shooting chart for the room temperature thermistor (Th
Unit Thermistor
Room temperature
(1)
thermistor (Th )
1
except for "continuous"
thermal setting.
Heat exchanger
thermistor (Th )
2
Defrost thermostat
(23DH)
Notes
(1) When the room temperature thermistor (Th
"CONTINUOUS"
(2) When switching to the defrost cycle, 23DH opens (broken connection), the machanism resets to heating, and defrosting will not operate.
(6) How to make sure of remote controller
(1)
Is remote
NO
controller
normal?
YES
Again pushing
operating switch
YES
Operating the
unit?
NO
Does operating
backup switch
Operating the unit
YES
NO
Replace the
display
Operating the unit
NO
Remote
controller defects
88
Operation
Short circuit
Continuous Cooling operation
¡ Cannot be turned ON/OFF by thermostat
Cooling
¡ When FM
is on. "AUTO" is continuously
I
Hi
Heating will not operate
(CM, FM , FM all stopped)
o I
Heating
Cooling Cooling will not operate.
Heating will not operate
¡ Heating overload protect begins to operate
Heating
¡ When FM is on, "AUTO'" is continuously
Hi
¡ CM, FMo are stopped
Cooling will not operate (blown breaker)
¡ CM, FM
are ON
I
¡ FM
is OFF
Cooling o
Heating will not operate normally
(The defrosting will operate normally, but
23DH reset is not possible. De frosts for 10
Heating
minutes)
) will not operate normally. Cooling or heating operation may be run continuously by putting the thermostat setting on
1
Remote controller
defects
Abnormal is not
fount
Is control unit
normal
Is it normal
), heat exchanger thermistor (Th
1
Function
Cooling will not operate
¡ FM
: continuous operation
I
¡ CM,FM
Continuous heating operation.
¡ Cannot be turned ON/OFF by thermostat
¡ When FM
Cooling will operate
¡ Heat exchanger frost preventer begins to operate
¡ Cools alternately for 10 minutes, stopping for 3
minutes.
Heating will not operate normally
¡ CM, FM
¡ FM
is OFF
I
¡ Hot keep lamp illuminated
No effect
Heating will operate.
¡ Unable to defros
¡ Will not operate for very long when outside air
temperature is low
Note (1) How to check the remote controller
S32, 40 models
(a) Press the reset switch of remote controller.
(b) If the salmost normal if entire display of remote control-
ler is shown after
S50,56 models
(a) Press the reset switch of remote controller.
(b) If the setting temperature is displayed 0˚C and then
the present time is displayed 12:00, there is no
significant problem.
) and defrost thermostat (23DH)
2
Broken connection
: stopped
o
is on. "AUTO" is continuously Hi
I
are ON
o
(2)
indication.