10. TROUBLESHOOTING
10-1. Check before and after troubleshooting
10-1-1. Check power supply wiring.
●
Check that power supply wires are correctly connected to terminals L and N on the terminal plate in the outdoor
unit.
10-1-2. Check inter-unit wiring.
●
Check that inter-unit wiring is correctly connected to the indoor unit from the outdoor unit.
10-1-3. Check power supply.
●
Check that voltage is in specified range (±10% of the rating).
●
Check that power is being supplied.
10-1-4. Check lead wires and connectors in indoor and outdoor units.
●
Check that coating of lead wires is not damaged.
●
Check that lead wires and connectors are firmly connected.
●
Check that wiring is correct.
1
2
4
5
6
7
1
2
4
5
6
7
Indoor
unit
Outdoor
unit
Power supply :
220–240V~50Hz
Ground
Inter–unit
power wiring
1
2
4
5
6
7
L
1
2
4
5
6
7
Indoor
unit
Outdoor
unit
Ground
Ground
Ground
Inter–unit
power wiring
Inter–unit
control wiring
GRV180
MCAV180
N
1
2
4
5
6
7
Power supply :
220–240V~50Hz
L
N
Inter–unit
control wiring
GRV220
MCAV220
59
WARNING
Hazardous voltage can cause ELECTRIC SHOCK or
DEATH. Disconnect power or turn off circuit breaker
before you start checking or servicing.
