Panasonic 2WAY Multi Technical & Service Manual page 56

6
Is the varister (VA2) short-circuited between the phases or
Water heat
6-5
severely deteriorated?
exchange unit's
control board
and surrounding
area
Is electrical voltage being output to the secondary side of
6-6
the fuses (F1, F2)?
Is electrical voltage being output to the secondary side of
6-7
the noise fi lter (RF1?)
Is electrical voltage being output to the secondary side of
6-8
the power transformer (PT1?)
● See "5. Reference Document" for details on the procedure for replacing the water heat exchanger unit's
control board.
● For board and Electrical Wiring Diagram, see Chapter 6.
• Outdoor main board: page VI-2
• Outdoor power board: page VI-3
• Converter board: VI-4
• Indoor control board for DC motor models: page VI-5
• Outdoor Unit Electrical Wiring Diagram: page VI-6
IV–43
Replace the varister
Yes
(VA2)
No 6-6
Yes 6-7
Check that the wiring
and terminals around
No
the fuses are normal
and replace the fuses
Yes 6-8
Check that the wiring
and terminals around
No
RF1 are normal and
replace the RF1
Replace the water heat
Yes exchanger unit's control
board
Check that the wiring
and connectors around
No
PT1 are normal and
replace the PT1