Cooling Overload Operation - Mitsubishi Heavy Industries FDT71VNXWVH Service Manual

Hyper inverter packaged air-conditioners (split system, air to air heat pump type)

Table of Contents

Error code

Indoor control PCB

Remote control:

E35

Outdoor control PCB

Outdoor inverter

1. Applicable model

2. Error detection method

For the error detection method,

refer to the protective control by

controlling compressor rotation

speed and cooling high pressure

protective control of micro-

computer control function for

corresponding models.

3. Condition of error displayed

When outdoor heat exchanger

temperature anomaly is detected

5 times within 60 minutes or

this anomalous state is detected

60 minutes continuously

including compressor stop.

4. Presumable cause

• Defective outdoor heat

exchanger temperature sensor

• Defective outdoor unit control

(or main) PCB

• Indoor, outdoor unit

installation spaces

• Short-circuit of air on indoor,

outdoor units

• Fouling, clogging of heat

exchanger

• Excessive refrigerant amount

Note:

LED

Green

Keeps flashing

Yellow LED

PCB

Keeps flashing

5. Troubleshooting

outdoor heat exchanger

unit operating in the

(measured actually) at

detection of error

* For the contents of control, refer to cooling high pressure protective control

in the protective control by controlling compressor rotation speed of

microcomputer control function for corresponding models.

Red

Content

Stays OFF

1-time flash