Troubleshooting - Mitsubishi Electric Fresh Master GUF-50RD3 Installation Instructions Manual

11. Troubleshooting

See below for possible remedies when there is an error during test operation and [Check] followed by a 4-digit number is displayed on the remote
controller.
Error code Error content
0900 Test run
2600 Drain error
2601 Disconnected water sensor
connector
3602 Damper motor error
4116 Fan motor error
5101 Indoor temperature sensor
error
5102 Liquid pipe temperature
sensor error
5103 Gas pipe temperature sensor
error
5104 Outdoor temperature sensor
error
H0 Booting system
– Unable to register.
– Operation display comes up
with the Remote controller,
however it turns off immedi-
ately.
Cause
• Is the test operation SW of either the fan,
humidifier solenoid valve or bypass damper
turned ON?
• Drain water is not properly discharged.
• Is there a leak from the permeable-film
humidifier?
• Is there a leak from the permeable-film
humidifier?
• When no problem is discovered after
checking the above items.
• Is the CN4D connector firmly connected?
• Is the relay connector between the PCB and
water sensor firmly connected?
• When no problem is discovered after
checking the above item.
• Is the CNL connector firmly connected?
• Is the connector of the damper motor
section firmly connected?
• Does the damper operate when the damper
motor is running?
• When no problem is discovered after
checking the above items.
• The motor continues to run when the
operation is stopped.
• Are the connectors of each thermister firmly
connected?
• Is each relay connector firmly connected?
• When no problem is discovered after
checking the above item.
• Has 10 minutes passed since system boot-
up?
• Has group registration been made?
• Has the Fresh Master address been
changed?
• When no problem is discovered after
checking the above items.
• The Fresh Master which is linked with air
conditioner, cannot be group registered
other than the interlock setting with the
Remote controller.
• Main power hasn't supplied to the Fresh
Master.
Remedy
• Set the test operation SW (SW1-1, 7, 8) to
OFF.
• The body must be levelly installed.
The drain pipe must be installed with
gradient of more than 1/100.
• Fix the water leak.
• Replace the permeable-film humidifier.
• Replace the PCB (printed circuit board).
• Firmly connect the connector.
• Firmly connect the connector.
• Replace the PCB (printer circuit board).
• Firmly connect the connector.
• Firmly connect the connector.
• Replace the damper motor if not working.
• Replace the PCB (printed circuit board).
• Replace the PCB (printed circuit board).
• Firmly connect each connector.
• Firmly connect each connector.
• Replace the PCB (printed circuit board).
• After system boot-up, HO may flash for a
maximum of 10 minutes. However, this is
not a malfunction.
• Conduct group registration. If there is a
master system controller such as the central
controller, use the controller to conduct
group registration.
• If the Fresh Master main unit address has
been changed, conduct the group registra-
tion again.
• If HO continues to flash for more than 10
minutes after reregistering the group and
rebooting, replace the PCB (printed circuit
board).
• Change the setting of the SW3-1 switch and
reset the registration or register it inter-
locked.
• Supply Main Power.
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