Mitsubishi Heavy Industries FDCW100VNX, Technical Manual

Page: 123 / 173

Service
- 122 -
E40 - HP alarm
YES
YES
YES
Connect the EEV correctly.
NO
NO
NO
Connect the switch correctly. NO
YES
If the voltage supply to the outdoor unit is switched off and on too
quickly, E40 may be displayed. This is normal.
Are the service valves fully open?
Open the service valves.
Is the high pressure switch
(63H1) correctly connected?
Has the high pressure switch
(63H1) been activated?
Is the electronic expansion valve
correctly connected?
Defective control PCB - replace.
1. During cooling:
- Does the fan motor run?
- Is the air flow obstructed?
- Is the installation space sufficient?
2. During heating:
- Is the indoor module’s sensor for
the heat exchanger correctly
connected?
- Is the filter blocked?
NO
NO
NO
YES
NO NO
YES
YES
YES
YES
NO
Is the service valve on the water
line open?
Open it.
Is the valve(s) (QM31or QN11)
functioning properly?
Is the operation signal of the
valves outputted correctly?
Replace the indoor unit relay board AA6.
Replace the valve(s).
Still the phenomenon persists,
If the phenomenon persists,
Is there clogging on the strainer on
the water line?
YES
NO
Clean - up the strainer.
Is air - bleed done properly? Bleed the air in the water line.
Is the circulation pump setting
(Menu 2.2.5) done properly?
Set the appropriate value to
obtain enough water flow.
Is the operation signal of the pump
outputted correctly?
YES
Replace the pump.
Replace the indoor unit relay board AA6.
Troubleshooting guide