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7-4
TROUBLESHOOTING
Power Failed (Dead),
No display?
Replace the
Main PCB
Reconnect. If
defective harness,
replace or fix
Reconnect. If
defective harness,
replace or fix
Plug in the unit
Check the connection of
Power Cord. Normal?
Yes
No
2
Check the connection of
Main PCB.(CN01)
Normal?
Yes
No
3
Check the button beep.
Touch the Clear button,
Can hear the beep sound?
No
Yes
1
Reconnect. If
defective harness,
replace or fix
Check the AC input of Main
PCB.
- Main PCB CN01
(Pin 1 and 3)
120V AC?
Yes
No
4
Reconnect.
Replace the
Thermostat
Replace the
Main PCB
Check the Thermostat
- Normal : Short
- Abnormal : Open
Normal?
Yes
No
6
Check the connection of
L1 and N at Terminal block.
Normal?
No
Yes
5