25
3. Outdoor unit failure mode table
OFF
2-time flash
2.5 seconds OFF
3-time flash
2.5 seconds OFF
4-time flash
2.5 seconds OFF
5-time flash
2.5 seconds OFF
6-time flash
2.5 seconds OFF
7-time flash
2.5 seconds OFF
8-time flash
2.5 seconds OFF
9-time flash
2.5 seconds OFF
10-time flash
2.5 seconds OFF
11-time flash
2.5 seconds OFF
12-time flash
2.5 seconds OFF
14-time flash
2.5 seconds OFF
Normal
Outdoor power system
Outdoor thermistors
Overcurrent protection
Refrigerant system
protection
High pressure protection
Fin temperature/ P.C.
board temperature
thermistor
overheat protection
Outdoor fan protection
Outdoor control system
Low discharge
temperature protection
Converter control
system
Overcurrent protection
Outdoor unit
(Other abnormality)
Outdoor power system
Discharge temperature thermistor
Defrost thermistor
Fin temperature thermistor
P.C. board temperature thermistor
Ambient temperature thermistor
Overcurrent protection
Compressor synchronous abnormality
( Compressor start-up failure
protection)
Discharge temperature thermistor
overheat protection
High pressure overheat protection
Fin temperature/ P.C. board
temperature thermistor
overheat protection
Outdoor fan protection
Nonvolatile memory data
Low discharge temperature
protection
DC voltage
Compressor each phase current
Compressor open-phase protection
Outdoor unit
1-time flash every
2.5 seconds
3-time flash
2.5 seconds OFF
4-time flash
2.5 seconds OFF
2-time flash
2.5 seconds OFF
11-time flash
2.5 seconds OFF
12-time flash
2.5 seconds OFF
7-time flash
2.5 seconds OFF
5-time flash
2.5 seconds OFF
8-time flash
2.5 seconds OFF
9-time flash
2.5 seconds OFF
10-time flash
2.5 seconds OFF
When it consecutively occurs 3 times that the compressor
stops for overcurrent protection or start-up failure protection
within 1 minute after stat-up.
When thermistors short or open during compressor running.
When 14A(MUZ-FA25VA, MUZ-FA25VAH)/ 24A(MUZ-
FA35VA, MUZ-FA35VAH) current flow into intelligent
power module.
When waveform of compressor current is distorted.
When discharge temperature thermistor exceeds116
:
.
When indoor coil thermistor exceeds 70
:
in HEAT mode.
When defrost thermistor exceeds 70
:
in COOL mode.
When temperature of fin temperature thermistor on the
inverter P.C. board exceeds 83
:
(MUZ-FA25VA,
MUZ-FA25VAH)/ 82
:
(MUZ-FA35VA, MUZ-FA35VAH),
or temperature of P.C. board temperature thermistor
exceeds 85
:
(MUZ-FA25VA, MUZ-FA25VAH)/ 81
:
(MUZ-FA35VA, MUZ-FA35VAH).
When outdoor fan has stopped within 30 seconds 3-times
in a row after outdoor fan start-up, unit stops.
When nonvolatile memory data cannot be read properly,
unit stops.
When discharge temperature has been 50
:
or less
for 20 minutes.
When DC voltage of inverter cannot be detected normally.
When compressor each phase current cannot
be detected normally.
When 14A(MUZ-FA25VA, MUZ-FA25VAH)/ 24A(MUZ-FA35
VA, MUZ-FA35VAH) current flow into intelligent power
module (IPM). When the open-phase operation of
compressor is detected. When the interphase short out
occurs in the output of the intelligent power module (IPM).
When the compressor winding shorts out.
When the inverter P.C. board is failured.
•Reconnect compressor connector.
•Refer to 11-6.
A
"How to check
inverter/ compressor".
•Check stop valve.
•Refer to 11-6.
G
"Check of
outdoor thermistors".
❈
Defective outdoor thermistors
can be identified by checking
the blinking pattern of LED.
•Reconnect compressor connector.
•Refer to 11-6.
A
"How to check
inverter/ compressor".
•Check stop valve.
•Reconnect compressor connector.
•Refer to 11-6.
A
"How to check
inverter/ compressor".
•Check refrigerant circuit and
refrigerant amount.
•Refer to 11-6.
L
"Check of LEV".
•Refer to 11-6.
G
"Check of
outdoor thermistors".
•Check refrigerant circuit and
refrigerant amount.
•Check stop valve.
•Check around outdoor unit.
•Check outdoor unit air passage.
•Refer to 11-6.
I
"Check of
outdoor fan motor".
•Refer to 11-6.
I
"Check of
outdoor fan motor.
Refer to 11-6.
N
"Check of inverter
P.C. board".
•Replace the inverter P.C. board.
•Check refrigerant circuit and
refrigerant amount.
•Refer to 11-6.
L
"Check of LEV".
•Refer to 11-6.
A
"How to check
inverter/ compressor".
•Reconnect compressor connector.
•Refer to 11-6.
A
"How to check
inverter/ compressor".
•Replace the inverter P.C. board.
POWER
lamp
Abnormal point (Failure mode)
Details of abnormal point
Detection method
Check point
Indoor/outdoor
unit failure mode
recall function
Outdoor unit
failure mode
recall function
LED indication
OB372--1qxp 05.1.17 15:29 Page 25
Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy
www.ilmalämpöpumput.com
