Troubleshooting - Mitsubishi Electric Fresh Master GUF-50RDH4 Installation Instructions Manual

12. 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
Test run
0900
Drain error
2600
Disconnected water sen-
sor connector
2601
Damper motor error
3602
Fan motor error
4116
Indoor temperature sen-
5101
sor error
Liquid pipe temperature
5102
sensor error
Gas pipe temperature
5103
sensor error
Outdoor temperature
5104
sensor error
Booting system
HO
Unable to register.
-
Operation display comes
up with the Remote con-
-
troller, however it turns
off immediately.
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 check-
ing 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 check-
ing 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 check-
ing the above items.
- The motor continues to run when the opera-
tion is stopped.
- Are the connectors of each thermister firmly
connected?
- Is each relay connector firmly connected?
- When no problem is discovered after check-
ing 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 check-
ing 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 sys-
tem 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 registration 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 interlocked.
- Supply Main Power.
21