Download TROUBLESHOOTING

15-5
Are there any poor connections or severed wires in the wiring Yes
between the outdoor unit’s main board and relay board?
No
Repair wiring
15-6
Check the relay board.
Does an output voltage (AC 200 V) from discharge valves 1-1, Yes
1-2, discharge valve 2, suction valve 2-1 and 2-2 exist with
15-6
“v_open” (valve open) in the No. 4 test mode?
Does suction valve 1 output voltage (AC 200 V) during cooling No
operations?
Check the solenoid valve coil.
(The power must be turned off before starting work.)
Disconnect the connectors of the discharge valve 1-1, 1-2,
discharge valve 2, suction valve 1, suction valve 2-1 and 2-2
from the relay board and measure the resistance between No.
15-7
1 and 3.
Normal values (20°C): Discharge valves 1-1, 1-2: 543 Ω,
Discharge valve 2: 1,132 Ω
Suction valve 1: 1,197 Ω, Suction valves 2-1, 2-2: 543 Ω
Is the coil operating normally?
15-7
Replace the relay
board
Resistance Replace the
normal
solenoid valve
Replace the
Resistance
solenoid valve’s
abnormal
coil
● See instructions packaged with servicing indoor board for procedure on replacing indoor control board.
● See “5. Reference Document” for details on the procedure for replacing the water heat exchanger unit’s
control board.
● 2-2
Any air shortage?
An air shortage is likely if the installation conditions pictured below are not met.
Unit perimeter
Unit top
or more
or more
Refrigerant tubing
Front
or more
Phase
Phase
Gray Yellow Orange
● 6-2
Normal if a pulse voltage is applied across indoor control board
connector PMV 6P (white) CN082 No. 5 and No. 1-4 after turning
power ON. (About DC4V measured on tester)
Red Black White
Orange Yellow Gray
● 6-1
Indoor electric valve check
Electric valve opening determination standards:
During heating operation, after 30 minutes have passed in complete combustion, the
indoor coil outlet temperature must exceed 40°C.
Check using No.0 Operation data display.
● 6-3
Unplug indoor electric valve connector 6P (white), and measure
resistance of electric valve coil between No.5 and No.1-4 using a
tester. Replace coil if 0Ω or ∞ (46Ω is normal).
Red Black White
Phase
Phase
B
IV–98
GHP_troubleshooting.indb IV‒98
2012/11/26 11:20:15