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7. Troubleshooting
Work precautions
• When servicing, be sure to recreate the malfunction two or three times before starting repairs.
• When servicing, always keep proper footing.
• When servicing, make sure that the power supply isolator is off, so as no electrical shock or injury to occur.
Pay sufficient attention when working on the product.
• Always connect the power wires properly.
• When removing the circuit board, always hold it at both ends and remove carefully so as not to apply force
to the surface mounted parts.
• When removing the circuit board, be careful of the metal edges on the board.
• When removing or inserting the connectors for the circuit board, hold the entire housing section. Never pull
on the lead wires.
• If it is thought that there is a printed circuit board malfunction, check for disconnected wires in the print pat-
tern, burnt parts or discoloration.
• If the printed circuit board is replaced, make sure that the switch settings on the new board are the same as
the old board.
• When servicing or checking around the humidifying unit, make sure to close the service valve.
(
1
)
Troubleshooting 1: The system will not start properly.
Initialization checklist from installation to operation
(
Table 1
)
After checking the system, check the checkpoints listed below.
Power supply
(
Table 1-1
)
Transmission cables (Table 1-2)
Check the following checkpoints when connecting with the remote controller or M-NET controller.
No. Checkpoint Action
1 Is the main power supply on? Turn on the main power supply.
2 Do the main power supply switching capacity and wiring diameter meet
specification?
Use specified items.
3 Is the specified power supply of 220 to 240 V AC (220 V AC for GUF-
100RDH4-60) connected to the power supply terminal
(
TM1
)
?
Connect the specified power sup-
ply.
4 Has the fuse
(
FUSE 1
)
on the circuit board blown? Replace the circuit board.
5
Are connector CNT of the transformer primary (input) and connector CN3T of
the transformer secondary (output) on the circuit board securely connected?
Connect them securely.
6
Is the power supply wiring incorrectly wired, or is there a faulty connection?
Make secure connections.
7 Is power display LED1 (red) on the circuit board unlit? Check the above checkpoints.
No. Checkpoint Action
1 Do the transmission cables meet regulations?
(
Type, diameter
)
Use specified cables.
2 Is the transmission cable wired at least 5 cm away from the power supply
cable?
Wire the transmission cable at least 5
cm away from the power supply cable.
3 Are multiple transmission or signal cables wired to the same power cable
duct?
Wire the transmission cables away
from the signal cables.
4 Are multiple transmission cables wired with multi-core cables? Use suitable cables to wire the
transmission cables so that they
are separated from one another.
5 Are the transmission cables securely connected to the terminals? Connect them securely.
6 Are the address switches on the circuit board (SW11 and SW12) set to
the correct number?
Make the setting so that the ad-
dress does not duplicate that of
other devices within M-NET control.
7 Are the transmission cables connected to the specified terminal blocks?
MA remote controller: TM2 1, 2
M-NET controller: TM2
A
,
B
Connect them to the specified
terminal blocks.
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