21 Changi South Street 1 Singapore 486777 Phone: +65 65420833 Fax: +65 65426920
E-mail: ductless@escoglobal.com Website:
www.escoglobal.com/ductless
SERVICE SECTION
CHAPTER 3 - TROUBLESHOOTING
Problem
Possible
causes
Corrective Action
Spoilt main
board
Restart the cabinet several times. If the following conditions persist, you should know
that the main board is spoiled:
1. Main Board input is correct (7.5VDC)
2. All LEDs on the membrane are always off
3. LCD displays nothing
4. No sound from buzzer on Relay Board
Please replace the main board
Spoilt Relay
Board
You should know that the relay board is spoiled if you observe the following
conditions:
1. Main Board is working properly
2. FRC cable between main board and relay board is properly installed.
3. Relay board input is correct (7.5VDC).
4. All the connectors and fuses have also been connected properly and are in good
working condition. To check for any loose connections on relay board, you need to
switch off main supply, and then use your finger to pull the cables attached to the
relay board one by one to check its tightness. To check fuse, you also need to switch
off main supply, find out fuse (F7, F8, F4, F1, F5) located on relay board, pull them
out to check.
5. Neither
FAN, LIGHT nor UV can be controlled.
Please replace the relay board.
Fan is Off
Please switch on the FAN by pressing the FAN button near LCD. The green LED
above the FAN button will illuminate.
Blown fuse
Switch off the cabinet. Check for fuse F1 on the relay board. If the fuse has blown,
replace it with a new one. Temporary solution: take out fuse F5 and put it in to
replace blown F1. Relay Board is located on the electrical panel. Fuse F1 and F5 are
located on this relay board.
Motor is silent
Faulty relays
1. Switch off the cabinet.
2. Check LS1 relay on the relay board. Ensure that C-NC connection is closed (0
resistance) and C-NO is opened (unlimited resistance). The method is to measure
resistance between C and NC; C and NO on terminal J2.
3. If LS1 has no problem, check K1 relay, it is located on the electrical panel. With
cabinet still switched-off, see if the cables attached to the relay are tight and check if
relay K1 got some burnt marks (black color mark inside).
4. If relay K1 is spoiled, replace it. The correct Relay model can be found from
Replacement Part List, contact your distributor to get the replacement part. To
replace the relay, pull out the spoiled relay and insert the new relay to the socket, no
wiring involved.
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