Damper Opens And Never Closes - Fisher & Paykel RX256DT4X1 FP Service Manual

8.2.4

Damper Opens and Never Closes

Measure voltage
from pin 4 and pin
9 on J3.
Do you
read line
voltage?
Check continuity
of FZ liner harness
and HV PCB
harness. Replace
as necessary.
Replace damper.
Is damper
correctly?
Use Service Test
121 to close the
damper.
Does the
No
damper move to
the closed
position?
Replace HV box
No
assembly
12872238.
Yes
wired
Yes
Use Service Test
Yes
121 to open the
Does the
No
damper
close?
Done.
53
damper.
Exit service mode
and observe the
damper.
Yes
321023