Mitsubishi MT300 User Manual

Service
-
147
-
'10 • HM-T-149
Description
Alarm text on the
display
Alarm
no.
May be due to
16 Aborted defrost - Insufficient water flow
Also see the troubleshooting guide on page 158.
Occurs if alarm 78 occurs 10 times continuously
during defrost operation.
33 S. fault Liquid line Sensor fault, liquid line (BT15). - Open-circuit or short-circuit on sensor input
Also see the troubleshooting guide on page 160.
- Sensor does not work (see “Temperature sensor”
section)
32 Sensor fault KF Sensor fault, condensor out (BT12).
Also see the troubleshooting guide on page 160.
- Sensor does not work (see “Temperature sensor”
section)
- Open-circuit or short-circuit on sensor input
31 S. fault HP Sensor fault, high pressure (BP4).
- Open-circuit or short-circuit on sensor input
- Sensor does not work
Also see the troubleshooting guide on page 159.
Outdoor unit alarm
Description
Alarm text on the
display
Alarm
no.
May be due to
E5
E35
E36
E37
E38
OU Com. error
High HX temp
Permanent Hotgas
S. fault Tho-R
S. fault Tho-A
Communication between the outdoor unit and
indoor unit is not made.
Temperature deviation on the hot gas sensor (Tho-
R1/R2) five times within 60 minutes or under 60
minutes.
- Isolator switch for outdoor unit off
- Electrical noise from the other equipment.
- Insufficient air circulation or blocked heat exchang-
er
- Blocked filter
- Open-circuit or short-circuit on sensor input
- Defective control PCB in outdoor unit
Also see the troubleshooting guide on page 163.
-Defective control PCB in outdoor unit
Also see the troubleshooting guide on page 162.
- If the fault persists during cooling, there may be an
insufficient amount of refrigerant.
- Sensor does not work (see “Temperature sensor”
section)
- Sensor does not work (see “Temperature sensor”
section)
- Open-circuit or short-circuit on sensor input
- Defective control PCB in outdoor unit
Also see the troubleshooting guide on page 164.
- Sensor does not work (see “Temperature sensor”
section)
- Sensor does not work (see “Temperature sensor”
section)
- Insufficient air circulation or blocked heat exchang-
er
- Defective control PCB in outdoor unit
- Too much refrigerant
Also see the troubleshooting guide on page 161.
Temperature deviation on the hot gas sensor (Tho-D)
two times within 60 minutes or under 60 minutes.
Sensor fault, heat exchanger in outdoor unit
(Tho-R).
Sensor fault, outdoor air sensor in outdoor unit
(Tho-A).
Alarm list

Mitsubishi MT300 Specifications

General

Brand	Mitsubishi
Model	MT300
Category	Heat Pump
Language	English